Source code for gammapy.catalog.hess

# Licensed under a 3-clause BSD style license - see LICENSE.rst
"""HESS Galactic plane survey (HGPS) catalog."""
import numpy as np
import astropy.units as u
from astropy.coordinates import Angle
from astropy.modeling.models import Gaussian1D
from astropy.table import Table
from gammapy.estimators import FluxPoints
from gammapy.maps import MapAxis, RegionGeom
from gammapy.modeling.models import Model, Models, SkyModel
from gammapy.utils.interpolation import ScaledRegularGridInterpolator
from gammapy.utils.scripts import make_path
from gammapy.utils.table import table_row_to_dict
from .core import SourceCatalog, SourceCatalogObject, format_flux_points_table

__all__ = [
    "SourceCatalogHGPS",
    "SourceCatalogLargeScaleHGPS",
    "SourceCatalogObjectHGPS",
    "SourceCatalogObjectHGPSComponent",
]

# Flux factor, used for printing
FF = 1e-12

# Multiplicative factor to go from cm^-2 s^-1 to % Crab for integral flux > 1 TeV
# Here we use the same Crab reference that's used in the HGPS paper
# CRAB = crab_integral_flux(energy_min=1, reference='hess_ecpl')
FLUX_TO_CRAB = 100 / 2.26e-11
FLUX_TO_CRAB_DIFF = 100 / 3.5060459323111307e-11


[docs]class SourceCatalogObjectHGPSComponent(SourceCatalogObject): """One Gaussian component from the HGPS catalog. See Also -------- SourceCatalogHGPS, SourceCatalogObjectHGPS """ _source_name_key = "Component_ID" def __init__(self, data): self.data = data def __repr__(self): return f"{self.__class__.__name__}({self.name!r})" def __str__(self): """Pretty-print source data""" d = self.data ss = "Component {}:\n".format(d["Component_ID"]) fmt = "{:<20s} : {:8.3f} +/- {:.3f} deg\n" ss += fmt.format("GLON", d["GLON"].value, d["GLON_Err"].value) ss += fmt.format("GLAT", d["GLAT"].value, d["GLAT_Err"].value) fmt = "{:<20s} : {:.3f} +/- {:.3f} deg\n" ss += fmt.format("Size", d["Size"].value, d["Size_Err"].value) val, err = d["Flux_Map"].value, d["Flux_Map_Err"].value fmt = "{:<20s} : ({:.2f} +/- {:.2f}) x 10^-12 cm^-2 s^-1 = ({:.1f} +/- {:.1f}) % Crab" ss += fmt.format( "Flux (>1 TeV)", val / FF, err / FF, val * FLUX_TO_CRAB, err * FLUX_TO_CRAB ) return ss @property def name(self): """Source name (str)""" return self.data[self._source_name_key]
[docs] def spatial_model(self): """Component spatial model (`~gammapy.modeling.models.GaussianSpatialModel`).""" d = self.data tag = "GaussianSpatialModel" pars = { "lon_0": d["GLON"], "lat_0": d["GLAT"], "sigma": d["Size"], "frame": "galactic", } errs = {"lon_0": d["GLON_Err"], "lat_0": d["GLAT_Err"], "sigma": d["Size_Err"]} model = Model.create(tag, "spatial", **pars) for name, value in errs.items(): model.parameters[name].error = value return model
[docs]class SourceCatalogObjectHGPS(SourceCatalogObject): """One object from the HGPS catalog. The catalog is represented by `SourceCatalogHGPS`. Examples are given there. """ def __repr__(self): return f"{self.__class__.__name__}({self.name!r})" def __str__(self): return self.info() @property def flux_points(self): """Flux points (`~gammapy.estimators.FluxPoints`).""" reference_model = SkyModel(spectral_model=self.spectral_model(), name=self.name) return FluxPoints.from_table( self.flux_points_table, reference_model=reference_model, )
[docs] def info(self, info="all"): """Info string. Parameters ---------- info : {'all', 'basic', 'map', 'spec', 'flux_points', 'components', 'associations', 'id'} Comma separated list of options """ if info == "all": info = "basic,associations,id,map,spec,flux_points,components" ss = "" ops = info.split(",") if "basic" in ops: ss += self._info_basic() if "map" in ops: ss += self._info_map() if "spec" in ops: ss += self._info_spec() if "flux_points" in ops: ss += self._info_flux_points() if "components" in ops and hasattr(self, "components"): ss += self._info_components() if "associations" in ops: ss += self._info_associations() if "id" in ops and hasattr(self, "identification_info"): ss += self._info_id() return ss
def _info_basic(self): """Print basic info.""" d = self.data ss = "\n*** Basic info ***\n\n" ss += "Catalog row index (zero-based) : {}\n".format(self.row_index) ss += "{:<20s} : {}\n".format("Source name", self.name) ss += "{:<20s} : {}\n".format("Analysis reference", d["Analysis_Reference"]) ss += "{:<20s} : {}\n".format("Source class", d["Source_Class"]) ss += "{:<20s} : {}\n".format("Identified object", d["Identified_Object"]) ss += "{:<20s} : {}\n".format("Gamma-Cat id", d["Gamma_Cat_Source_ID"]) ss += "\n" return ss def _info_associations(self): ss = "\n*** Source associations info ***\n\n" lines = self.associations.pformat(max_width=-1, max_lines=-1) ss += "\n".join(lines) return ss + "\n" def _info_id(self): ss = "\n*** Source identification info ***\n\n" ss += "\n".join(f"{k}: {v}" for k, v in self.identification_info.items()) return ss + "\n" def _info_map(self): """Print info from map analysis.""" d = self.data ss = "\n*** Info from map analysis ***\n\n" ra_str = Angle(d["RAJ2000"], "deg").to_string(unit="hour", precision=0) dec_str = Angle(d["DEJ2000"], "deg").to_string(unit="deg", precision=0) ss += "{:<20s} : {:8.3f} = {}\n".format("RA", d["RAJ2000"], ra_str) ss += "{:<20s} : {:8.3f} = {}\n".format("DEC", d["DEJ2000"], dec_str) ss += "{:<20s} : {:8.3f} +/- {:.3f} deg\n".format( "GLON", d["GLON"].value, d["GLON_Err"].value ) ss += "{:<20s} : {:8.3f} +/- {:.3f} deg\n".format( "GLAT", d["GLAT"].value, d["GLAT_Err"].value ) ss += "{:<20s} : {:.3f}\n".format("Position Error (68%)", d["Pos_Err_68"]) ss += "{:<20s} : {:.3f}\n".format("Position Error (95%)", d["Pos_Err_95"]) ss += "{:<20s} : {:.0f}\n".format("ROI number", d["ROI_Number"]) ss += "{:<20s} : {}\n".format("Spatial model", d["Spatial_Model"]) ss += "{:<20s} : {}\n".format("Spatial components", d["Components"]) ss += "{:<20s} : {:.1f}\n".format("TS", d["Sqrt_TS"] ** 2) ss += "{:<20s} : {:.1f}\n".format("sqrt(TS)", d["Sqrt_TS"]) ss += "{:<20s} : {:.3f} +/- {:.3f} (UL: {:.3f}) deg\n".format( "Size", d["Size"].value, d["Size_Err"].value, d["Size_UL"].value ) ss += "{:<20s} : {:.3f}\n".format("R70", d["R70"]) ss += "{:<20s} : {:.3f}\n".format("RSpec", d["RSpec"]) ss += "{:<20s} : {:.1f}\n".format("Total model excess", d["Excess_Model_Total"]) ss += "{:<20s} : {:.1f}\n".format("Excess in RSpec", d["Excess_RSpec"]) ss += "{:<20s} : {:.1f}\n".format( "Model Excess in RSpec", d["Excess_RSpec_Model"] ) ss += "{:<20s} : {:.1f}\n".format("Background in RSpec", d["Background_RSpec"]) ss += "{:<20s} : {:.1f} hours\n".format("Livetime", d["Livetime"].value) ss += "{:<20s} : {:.2f}\n".format("Energy threshold", d["Energy_Threshold"]) val, err = d["Flux_Map"].value, d["Flux_Map_Err"].value ss += "{:<20s} : ({:.3f} +/- {:.3f}) x 10^-12 cm^-2 s^-1 = ({:.2f} +/- {:.2f}) % Crab\n".format( "Source flux (>1 TeV)", val / FF, err / FF, val * FLUX_TO_CRAB, err * FLUX_TO_CRAB, ) ss += "\nFluxes in RSpec (> 1 TeV):\n" ss += "{:<30s} : {:.3f} x 10^-12 cm^-2 s^-1 = {:5.2f} % Crab\n".format( "Map measurement", d["Flux_Map_RSpec_Data"].value / FF, d["Flux_Map_RSpec_Data"].value * FLUX_TO_CRAB, ) ss += "{:<30s} : {:.3f} x 10^-12 cm^-2 s^-1 = {:5.2f} % Crab\n".format( "Source model", d["Flux_Map_RSpec_Source"].value / FF, d["Flux_Map_RSpec_Source"].value * FLUX_TO_CRAB, ) ss += "{:<30s} : {:.3f} x 10^-12 cm^-2 s^-1 = {:5.2f} % Crab\n".format( "Other component model", d["Flux_Map_RSpec_Other"].value / FF, d["Flux_Map_RSpec_Other"].value * FLUX_TO_CRAB, ) ss += "{:<30s} : {:.3f} x 10^-12 cm^-2 s^-1 = {:5.2f} % Crab\n".format( "Large scale component model", d["Flux_Map_RSpec_LS"].value / FF, d["Flux_Map_RSpec_LS"].value * FLUX_TO_CRAB, ) ss += "{:<30s} : {:.3f} x 10^-12 cm^-2 s^-1 = {:5.2f} % Crab\n".format( "Total model", d["Flux_Map_RSpec_Total"].value / FF, d["Flux_Map_RSpec_Total"].value * FLUX_TO_CRAB, ) ss += "{:<35s} : {:5.1f} %\n".format( "Containment in RSpec", 100 * d["Containment_RSpec"] ) ss += "{:<35s} : {:5.1f} %\n".format( "Contamination in RSpec", 100 * d["Contamination_RSpec"] ) label, val = ( "Flux correction (RSpec -> Total)", 100 * d["Flux_Correction_RSpec_To_Total"], ) ss += f"{label:<35s} : {val:5.1f} %\n" label, val = ( "Flux correction (Total -> RSpec)", 100 * (1 / d["Flux_Correction_RSpec_To_Total"]), ) ss += f"{label:<35s} : {val:5.1f} %\n" return ss def _info_spec(self): """Print info from spectral analysis.""" d = self.data ss = "\n*** Info from spectral analysis ***\n\n" ss += "{:<20s} : {:.1f} hours\n".format("Livetime", d["Livetime_Spec"].value) lo = d["Energy_Range_Spec_Min"].value hi = d["Energy_Range_Spec_Max"].value ss += "{:<20s} : {:.2f} to {:.2f} TeV\n".format("Energy range:", lo, hi) ss += "{:<20s} : {:.1f}\n".format("Background", d["Background_Spec"]) ss += "{:<20s} : {:.1f}\n".format("Excess", d["Excess_Spec"]) ss += "{:<20s} : {}\n".format("Spectral model", d["Spectral_Model"]) val = d["TS_ECPL_over_PL"] ss += "{:<20s} : {:.1f}\n".format("TS ECPL over PL", val) val = d["Flux_Spec_Int_1TeV"].value err = d["Flux_Spec_Int_1TeV_Err"].value ss += "{:<20s} : ({:.3f} +/- {:.3f}) x 10^-12 cm^-2 s^-1 = ({:.2f} +/- {:.2f}) % Crab\n".format( "Best-fit model flux(> 1 TeV)", val / FF, err / FF, val * FLUX_TO_CRAB, err * FLUX_TO_CRAB, ) val = d["Flux_Spec_Energy_1_10_TeV"].value err = d["Flux_Spec_Energy_1_10_TeV_Err"].value ss += "{:<20s} : ({:.3f} +/- {:.3f}) x 10^-12 erg cm^-2 s^-1\n".format( "Best-fit model energy flux(1 to 10 TeV)", val / FF, err / FF ) ss += self._info_spec_pl() ss += self._info_spec_ecpl() return ss def _info_spec_pl(self): d = self.data ss = "{:<20s} : {:.2f}\n".format("Pivot energy", d["Energy_Spec_PL_Pivot"]) val = d["Flux_Spec_PL_Diff_Pivot"].value err = d["Flux_Spec_PL_Diff_Pivot_Err"].value ss += "{:<20s} : ({:.3f} +/- {:.3f}) x 10^-12 cm^-2 s^-1 TeV^-1 = ({:.2f} +/- {:.2f}) % Crab\n".format( "Flux at pivot energy", val / FF, err / FF, val * FLUX_TO_CRAB, err * FLUX_TO_CRAB_DIFF, ) val = d["Flux_Spec_PL_Int_1TeV"].value err = d["Flux_Spec_PL_Int_1TeV_Err"].value ss += "{:<20s} : ({:.3f} +/- {:.3f}) x 10^-12 cm^-2 s^-1 = ({:.2f} +/- {:.2f}) % Crab\n".format( "PL Flux(> 1 TeV)", val / FF, err / FF, val * FLUX_TO_CRAB, err * FLUX_TO_CRAB, ) val = d["Flux_Spec_PL_Diff_1TeV"].value err = d["Flux_Spec_PL_Diff_1TeV_Err"].value ss += "{:<20s} : ({:.3f} +/- {:.3f}) x 10^-12 cm^-2 s^-1 TeV^-1 = ({:.2f} +/- {:.2f}) % Crab\n".format( "PL Flux(@ 1 TeV)", val / FF, err / FF, val * FLUX_TO_CRAB, err * FLUX_TO_CRAB_DIFF, ) val = d["Index_Spec_PL"] err = d["Index_Spec_PL_Err"] ss += "{:<20s} : {:.2f} +/- {:.2f}\n".format("PL Index", val, err) return ss def _info_spec_ecpl(self): d = self.data ss = "" # ss = '{:<20s} : {:.1f}\n'.format('Pivot energy', d['Energy_Spec_ECPL_Pivot']) val = d["Flux_Spec_ECPL_Diff_1TeV"].value err = d["Flux_Spec_ECPL_Diff_1TeV_Err"].value ss += "{:<20s} : ({:.3f} +/- {:.3f}) x 10^-12 cm^-2 s^-1 TeV^-1 = ({:.2f} +/- {:.2f}) % Crab\n".format( "ECPL Flux(@ 1 TeV)", val / FF, err / FF, val * FLUX_TO_CRAB, err * FLUX_TO_CRAB_DIFF, ) val = d["Flux_Spec_ECPL_Int_1TeV"].value err = d["Flux_Spec_ECPL_Int_1TeV_Err"].value ss += "{:<20s} : ({:.3f} +/- {:.3f}) x 10^-12 cm^-2 s^-1 = ({:.2f} +/- {:.2f}) % Crab\n".format( "ECPL Flux(> 1 TeV)", val / FF, err / FF, val * FLUX_TO_CRAB, err * FLUX_TO_CRAB, ) val = d["Index_Spec_ECPL"] err = d["Index_Spec_ECPL_Err"] ss += "{:<20s} : {:.2f} +/- {:.2f}\n".format("ECPL Index", val, err) val = d["Lambda_Spec_ECPL"].value err = d["Lambda_Spec_ECPL_Err"].value ss += "{:<20s} : {:.3f} +/- {:.3f} TeV^-1\n".format("ECPL Lambda", val, err) # Use Gaussian analytical error propagation, # tested against the uncertainties package err = err / val**2 val = 1.0 / val ss += "{:<20s} : {:.2f} +/- {:.2f} TeV\n".format("ECPL E_cut", val, err) return ss def _info_flux_points(self): """Print flux point results""" d = self.data ss = "\n*** Flux points info ***\n\n" ss += "Number of flux points: {}\n".format(d["N_Flux_Points"]) ss += "Flux points table: \n\n" lines = format_flux_points_table(self.flux_points_table).pformat( max_width=-1, max_lines=-1 ) ss += "\n".join(lines) return ss + "\n" def _info_components(self): """Print info about the components.""" ss = "\n*** Gaussian component info ***\n\n" ss += "Number of components: {}\n".format(len(self.components)) ss += "{:<20s} : {}\n\n".format("Spatial components", self.data["Components"]) for component in self.components: ss += str(component) ss += "\n\n" return ss @property def energy_range(self): """Spectral model energy range (`~astropy.units.Quantity` with length 2).""" energy_min, energy_max = ( self.data["Energy_Range_Spec_Min"], self.data["Energy_Range_Spec_Max"], ) if np.isnan(energy_min): energy_min = u.Quantity(0.2, "TeV") if np.isnan(energy_max): energy_max = u.Quantity(50, "TeV") return u.Quantity([energy_min, energy_max], "TeV")
[docs] def spectral_model(self, which="best"): """Spectral model (`~gammapy.modeling.models.SpectralModel`). One of the following models (given by ``Spectral_Model`` in the catalog): - ``PL`` : `~gammapy.modeling.models.PowerLawSpectralModel` - ``ECPL`` : `~gammapy.modeling.models.ExpCutoffPowerLawSpectralModel` Parameters ---------- which : {'best', 'pl', 'ecpl'} Which spectral model """ data = self.data if which == "best": spec_type = self.data["Spectral_Model"].strip().lower() elif which in {"pl", "ecpl"}: spec_type = which else: raise ValueError(f"Invalid selection: which = {which!r}") if spec_type == "pl": tag = "PowerLawSpectralModel" pars = { "index": data["Index_Spec_PL"], "amplitude": data["Flux_Spec_PL_Diff_Pivot"], "reference": data["Energy_Spec_PL_Pivot"], } errs = { "amplitude": data["Flux_Spec_PL_Diff_Pivot_Err"], "index": data["Index_Spec_PL_Err"], } elif spec_type == "ecpl": tag = "ExpCutoffPowerLawSpectralModel" pars = { "index": data["Index_Spec_ECPL"], "amplitude": data["Flux_Spec_ECPL_Diff_Pivot"], "reference": data["Energy_Spec_ECPL_Pivot"], "lambda_": data["Lambda_Spec_ECPL"], } errs = { "index": data["Index_Spec_ECPL_Err"], "amplitude": data["Flux_Spec_ECPL_Diff_Pivot_Err"], "lambda_": data["Lambda_Spec_ECPL_Err"], } else: raise ValueError(f"Invalid spec_type: {spec_type}") model = Model.create(tag, "spectral", **pars) errs["reference"] = 0 * u.TeV for name, value in errs.items(): model.parameters[name].error = value return model
[docs] def spatial_model(self): """Spatial model (`~gammapy.modeling.models.SpatialModel`). One of the following models (given by ``Spatial_Model`` in the catalog): - ``Point-Like`` or has a size upper limit : `~gammapy.modeling.models.PointSpatialModel` - ``Gaussian``: `~gammapy.modeling.models.GaussianSpatialModel` - ``2-Gaussian`` or ``3-Gaussian``: composite model (using ``+`` with Gaussians) - ``Shell``: `~gammapy.modeling.models.ShellSpatialModel` """ d = self.data pars = {"lon_0": d["GLON"], "lat_0": d["GLAT"], "frame": "galactic"} errs = {"lon_0": d["GLON_Err"], "lat_0": d["GLAT_Err"]} spatial_type = self.data["Spatial_Model"] if spatial_type == "Point-Like": tag = "PointSpatialModel" elif spatial_type == "Gaussian": tag = "GaussianSpatialModel" pars["sigma"] = d["Size"] errs["sigma"] = d["Size_Err"] elif spatial_type in {"2-Gaussian", "3-Gaussian"}: raise ValueError("For Gaussian or Multi-Gaussian models, use sky_model()!") elif spatial_type == "Shell": # HGPS contains no information on shell width # Here we assume a 5% shell width for all shells. tag = "ShellSpatialModel" pars["radius"] = 0.95 * d["Size"] pars["width"] = d["Size"] - pars["radius"] errs["radius"] = d["Size_Err"] else: raise ValueError(f"Invalid spatial_type: {spatial_type}") model = Model.create(tag, "spatial", **pars) for name, value in errs.items(): model.parameters[name].error = value return model
[docs] def sky_model(self, which="best"): """Source sky model. Parameters ---------- which : {'best', 'pl', 'ecpl'} Which spectral model Returns ------- sky_model : `~gammapy.modeling.models.Models` Models of the catalog object. """ models = self.components_models(which=which) if len(models) > 1: geom = self._get_components_geom(models) return models.to_template_sky_model(geom=geom, name=self.name) else: return models[0]
[docs] def components_models(self, which="best", linked=False): """Models of the source components. Parameters ---------- which : {'best', 'pl', 'ecpl'} Which spectral model linked : bool Each sub-component of a source is given as a different `SkyModel` If True the spectral parameters except the mormalisation are linked. Default is False Returns ------- sky_model : `~gammapy.modeling.models.Models` Models of the catalog object. """ spatial_type = self.data["Spatial_Model"] missing_size = ( spatial_type == "Gaussian" and self.spatial_model().sigma.value == 0 ) if spatial_type in {"2-Gaussian", "3-Gaussian"} or missing_size: models = [] spectral_model = self.spectral_model(which=which) for component in self.components: spec_component = spectral_model.copy() weight = component.data["Flux_Map"] / self.data["Flux_Map"] spec_component.parameters["amplitude"].value *= weight if linked: for name in spec_component.parameters.names: if name not in ["norm", "amplitude"]: spec_component.__dict__[name] = spectral_model.parameters[ name ] model = SkyModel( spatial_model=component.spatial_model(), spectral_model=spec_component, name=component.name, ) models.append(model) else: models = [ SkyModel( spatial_model=self.spatial_model(), spectral_model=self.spectral_model(which=which), name=self.name, ) ] return Models(models)
@staticmethod def _get_components_geom(models): energy_axis = MapAxis.from_energy_bounds( "100 GeV", "100 TeV", nbin=10, per_decade=True, name="energy_true" ) regions = [m.spatial_model.evaluation_region for m in models] geom = RegionGeom.from_regions( regions, binsz_wcs="0.02 deg", axes=[energy_axis] ) return geom.to_wcs_geom() @property def flux_points_table(self): """Flux points table (`~astropy.table.Table`).""" table = Table() table.meta["sed_type_init"] = "dnde" table.meta["n_sigma_ul"] = 2 table.meta["n_sigma"] = 1 table.meta["sqrt_ts_threshold_ul"] = 1 mask = ~np.isnan(self.data["Flux_Points_Energy"]) table["e_ref"] = self.data["Flux_Points_Energy"][mask] table["e_min"] = self.data["Flux_Points_Energy_Min"][mask] table["e_max"] = self.data["Flux_Points_Energy_Max"][mask] table["dnde"] = self.data["Flux_Points_Flux"][mask] table["dnde_errn"] = self.data["Flux_Points_Flux_Err_Lo"][mask] table["dnde_errp"] = self.data["Flux_Points_Flux_Err_Hi"][mask] table["dnde_ul"] = self.data["Flux_Points_Flux_UL"][mask] table["is_ul"] = self.data["Flux_Points_Flux_Is_UL"][mask].astype("bool") return table
[docs]class SourceCatalogHGPS(SourceCatalog): """HESS Galactic plane survey (HGPS) source catalog. Reference: https://www.mpi-hd.mpg.de/hfm/HESS/hgps/ One source is represented by `SourceCatalogObjectHGPS`. Examples -------- Let's assume you have downloaded the HGPS catalog FITS file, e.g. via: .. code-block:: bash curl -O https://www.mpi-hd.mpg.de/hfm/HESS/hgps/data/hgps_catalog_v1.fits.gz Then you can load it up like this: >>> from gammapy.catalog import SourceCatalogHGPS >>> filename = '$GAMMAPY_DATA/catalogs/hgps_catalog_v1.fits.gz' >>> cat = SourceCatalogHGPS(filename) Access a source by name: >>> source = cat['HESS J1843-033'] >>> print(source) <BLANKLINE> *** Basic info *** <BLANKLINE> Catalog row index (zero-based) : 64 Source name : HESS J1843-033 Analysis reference : HGPS Source class : Unid Identified object : -- Gamma-Cat id : 126 <BLANKLINE> <BLANKLINE> *** Info from map analysis *** <BLANKLINE> RA : 280.952 deg = 18h43m48s DEC : -3.554 deg = -3d33m15s GLON : 28.899 +/- 0.072 deg GLAT : 0.075 +/- 0.036 deg Position Error (68%) : 0.122 deg Position Error (95%) : 0.197 deg ROI number : 3 Spatial model : 2-Gaussian Spatial components : HGPSC 083, HGPSC 084 TS : 256.6 sqrt(TS) : 16.0 Size : 0.239 +/- 0.063 (UL: 0.000) deg R70 : 0.376 deg RSpec : 0.376 deg Total model excess : 979.5 Excess in RSpec : 775.6 Model Excess in RSpec : 690.2 Background in RSpec : 1742.4 Livetime : 41.8 hours Energy threshold : 0.38 TeV Source flux (>1 TeV) : (2.882 +/- 0.305) x 10^-12 cm^-2 s^-1 = (12.75 +/- 1.35) % Crab <BLANKLINE> Fluxes in RSpec (> 1 TeV): Map measurement : 2.267 x 10^-12 cm^-2 s^-1 = 10.03 % Crab Source model : 2.018 x 10^-12 cm^-2 s^-1 = 8.93 % Crab Other component model : 0.004 x 10^-12 cm^-2 s^-1 = 0.02 % Crab Large scale component model : 0.361 x 10^-12 cm^-2 s^-1 = 1.60 % Crab Total model : 2.383 x 10^-12 cm^-2 s^-1 = 10.54 % Crab Containment in RSpec : 70.0 % Contamination in RSpec : 15.3 % Flux correction (RSpec -> Total) : 121.0 % Flux correction (Total -> RSpec) : 82.7 % <BLANKLINE> *** Info from spectral analysis *** <BLANKLINE> Livetime : 16.8 hours Energy range: : 0.22 to 61.90 TeV Background : 5126.9 Excess : 980.1 Spectral model : PL TS ECPL over PL : -- Best-fit model flux(> 1 TeV) : (3.043 +/- 0.196) x 10^-12 cm^-2 s^-1 = (13.47 +/- 0.87) % Crab Best-fit model energy flux(1 to 10 TeV) : (10.918 +/- 0.733) x 10^-12 erg cm^-2 s^-1 Pivot energy : 1.87 TeV Flux at pivot energy : (0.914 +/- 0.058) x 10^-12 cm^-2 s^-1 TeV^-1 = (4.04 +/- 0.17) % Crab PL Flux(> 1 TeV) : (3.043 +/- 0.196) x 10^-12 cm^-2 s^-1 = (13.47 +/- 0.87) % Crab PL Flux(@ 1 TeV) : (3.505 +/- 0.247) x 10^-12 cm^-2 s^-1 TeV^-1 = (15.51 +/- 0.70) % Crab PL Index : 2.15 +/- 0.05 ECPL Flux(@ 1 TeV) : (0.000 +/- 0.000) x 10^-12 cm^-2 s^-1 TeV^-1 = (0.00 +/- 0.00) % Crab ECPL Flux(> 1 TeV) : (0.000 +/- 0.000) x 10^-12 cm^-2 s^-1 = (0.00 +/- 0.00) % Crab ECPL Index : -- +/- -- ECPL Lambda : 0.000 +/- 0.000 TeV^-1 ECPL E_cut : inf +/- nan TeV <BLANKLINE> *** Flux points info *** <BLANKLINE> Number of flux points: 6 Flux points table: <BLANKLINE> e_ref e_min e_max dnde dnde_errn dnde_errp dnde_ul is_ul TeV TeV TeV 1 / (cm2 s TeV) 1 / (cm2 s TeV) 1 / (cm2 s TeV) 1 / (cm2 s TeV) ------ ------ ------ --------------- --------------- --------------- --------------- ----- 0.332 0.215 0.511 3.048e-11 6.890e-12 7.010e-12 4.455e-11 False 0.787 0.511 1.212 5.383e-12 6.655e-13 6.843e-13 6.739e-12 False 1.957 1.212 3.162 9.160e-13 9.732e-14 1.002e-13 1.120e-12 False 4.870 3.162 7.499 1.630e-13 2.001e-14 2.097e-14 2.054e-13 False 12.115 7.499 19.573 1.648e-14 3.124e-15 3.348e-15 2.344e-14 False 30.142 19.573 46.416 7.777e-16 4.468e-16 5.116e-16 1.883e-15 False <BLANKLINE> *** Gaussian component info *** <BLANKLINE> Number of components: 2 Spatial components : HGPSC 083, HGPSC 084 <BLANKLINE> Component HGPSC 083: GLON : 29.047 +/- 0.026 deg GLAT : 0.244 +/- 0.027 deg Size : 0.125 +/- 0.021 deg Flux (>1 TeV) : (1.34 +/- 0.36) x 10^-12 cm^-2 s^-1 = (5.9 +/- 1.6) % Crab <BLANKLINE> Component HGPSC 084: GLON : 28.770 +/- 0.059 deg GLAT : -0.073 +/- 0.069 deg Size : 0.229 +/- 0.046 deg Flux (>1 TeV) : (1.54 +/- 0.47) x 10^-12 cm^-2 s^-1 = (6.8 +/- 2.1) % Crab <BLANKLINE> <BLANKLINE> *** Source associations info *** <BLANKLINE> Source_Name Association_Catalog Association_Name Separation deg ---------------- ------------------- --------------------- ---------- HESS J1843-033 3FGL 3FGL J1843.7-0322 0.178442 HESS J1843-033 3FGL 3FGL J1844.3-0344 0.242835 HESS J1843-033 SNR G28.6-0.1 0.330376 <BLANKLINE> Access source spectral data and plot it: >>> source.spectral_model().plot(source.energy_range) <AxesSubplot:xlabel='Energy [TeV]', ylabel='dnde [1 / (cm2 s TeV)]'> >>> source.spectral_model().plot_error(source.energy_range) <AxesSubplot:xlabel='Energy [TeV]', ylabel='dnde [1 / (cm2 s TeV)]'> >>> source.flux_points.plot() <AxesSubplot:xlabel='Energy [TeV]', ylabel='dnde (1 / (cm2 s TeV))'> Gaussian component information can be accessed as well, either via the source, or via the catalog: >>> source.components [SourceCatalogObjectHGPSComponent('HGPSC 083'), SourceCatalogObjectHGPSComponent('HGPSC 084')] >>> cat.gaussian_component(83) SourceCatalogObjectHGPSComponent('HGPSC 084') """ tag = "hgps" """Source catalog name (str).""" description = "H.E.S.S. Galactic plane survey (HGPS) source catalog" """Source catalog description (str).""" source_object_class = SourceCatalogObjectHGPS def __init__( self, filename="$GAMMAPY_DATA/catalogs/hgps_catalog_v1.fits.gz", hdu="HGPS_SOURCES", ): filename = make_path(filename) table = Table.read(filename, hdu=hdu) source_name_alias = ("Identified_Object",) super().__init__(table=table, source_name_alias=source_name_alias) self._table_components = Table.read(filename, hdu="HGPS_GAUSS_COMPONENTS") self._table_associations = Table.read(filename, hdu="HGPS_ASSOCIATIONS") self._table_associations["Separation"].format = ".6f" self._table_identifications = Table.read(filename, hdu="HGPS_IDENTIFICATIONS") self._table_large_scale_component = Table.read( filename, hdu="HGPS_LARGE_SCALE_COMPONENT" ) @property def table_components(self): """Gaussian component table (`~astropy.table.Table`)""" return self._table_components @property def table_associations(self): """Source association table (`~astropy.table.Table`)""" return self._table_associations @property def table_identifications(self): """Source identification table (`~astropy.table.Table`)""" return self._table_identifications @property def table_large_scale_component(self): """Large scale component table (`~astropy.table.Table`)""" return self._table_large_scale_component @property def large_scale_component(self): """Large scale component model (`~gammapy.catalog.SourceCatalogLargeScaleHGPS`).""" return SourceCatalogLargeScaleHGPS(self.table_large_scale_component) def _make_source_object(self, index): """Make `SourceCatalogObject` for given row index""" source = super()._make_source_object(index) if source.data["Components"] != "": source.components = list(self._get_gaussian_components(source)) self._attach_association_info(source) if source.data["Source_Class"] != "Unid": self._attach_identification_info(source) return source def _get_gaussian_components(self, source): for name in source.data["Components"].split(", "): row_index = int(name.split()[-1]) - 1 yield self.gaussian_component(row_index) def _attach_association_info(self, source): t = self.table_associations mask = source.data["Source_Name"] == t["Source_Name"] source.associations = t[mask] def _attach_identification_info(self, source): t = self._table_identifications idx = np.nonzero(source.name == t["Source_Name"])[0][0] source.identification_info = table_row_to_dict(t[idx])
[docs] def gaussian_component(self, row_idx): """Gaussian component (`SourceCatalogObjectHGPSComponent`).""" data = table_row_to_dict(self.table_components[row_idx]) data[SourceCatalogObject._row_index_key] = row_idx return SourceCatalogObjectHGPSComponent(data=data)
[docs] def to_models(self, which="best", components_status="independent"): """Create Models object from catalogue Parameters ---------- which : {'best', 'pl', 'ecpl'} Which spectral model components_status : {'independent', 'linked', 'merged'} Relation between the sources components: 'independent' : each sub-component of a source is given as a different `SkyModel` (Default) 'linked' : each sub-component of a source is given as a different `SkyModel` but the spectral parameters except the mormalisation are linked. 'merged' : the sub-components are merged into a single `SkyModel` given as a `~gammapy.modeling.models.TemplateSpatialModel` with a `~gammapy.modeling.models.PowerLawNormSpectralModel`. In that case the relavtie weights between the components cannot be adjusted. Returns ------- models : `~gammapy.modeling.models.Models` Models of the catalog. """ models = [] for source in self: if components_status == "merged": m = [source.sky_model(which=which)] else: m = source.components_models( which=which, linked=components_status == "linked" ) models.extend(m) return Models(models)
[docs]class SourceCatalogLargeScaleHGPS: """Gaussian band model. This 2-dimensional model is Gaussian in ``y`` for a given ``x``, and the Gaussian parameters can vary in ``x``. One application of this model is the diffuse emission along the Galactic plane, i.e. ``x = GLON`` and ``y = GLAT``. Parameters ---------- table : `~astropy.table.Table` Table of Gaussian parameters. ``x``, ``amplitude``, ``mean``, ``stddev``. interp_kwargs : dict Keyword arguments passed to `ScaledRegularGridInterpolator` """ def __init__(self, table, interp_kwargs=None): interp_kwargs = interp_kwargs or {} interp_kwargs.setdefault("values_scale", "lin") self.table = table glon = Angle(self.table["GLON"]).wrap_at("180d") interps = {} for column in table.colnames: values = self.table[column].quantity interp = ScaledRegularGridInterpolator((glon,), values, **interp_kwargs) interps[column] = interp self._interp = interps def _interpolate_parameter(self, parname, glon): glon = glon.wrap_at("180d") return self._interp[parname]((np.asanyarray(glon),), clip=False)
[docs] def peak_brightness(self, glon): """Peak brightness at a given longitude. Parameters ---------- glon : `~astropy.coordinates.Angle` Galactic Longitude. """ return self._interpolate_parameter("Surface_Brightness", glon)
[docs] def peak_brightness_error(self, glon): """Peak brightness error at a given longitude. Parameters ---------- glon : `~astropy.coordinates.Angle` Galactic Longitude. """ return self._interpolate_parameter("Surface_Brightness_Err", glon)
[docs] def width(self, glon): """Width at a given longitude. Parameters ---------- glon : `~astropy.coordinates.Angle` Galactic Longitude. """ return self._interpolate_parameter("Width", glon)
[docs] def width_error(self, glon): """Width error at a given longitude. Parameters ---------- glon : `~astropy.coordinates.Angle` Galactic Longitude. """ return self._interpolate_parameter("Width_Err", glon)
[docs] def peak_latitude(self, glon): """Peak position at a given longitude. Parameters ---------- glon : `~astropy.coordinates.Angle` Galactic Longitude. """ return self._interpolate_parameter("GLAT", glon)
[docs] def peak_latitude_error(self, glon): """Peak position error at a given longitude. Parameters ---------- glon : `~astropy.coordinates.Angle` Galactic Longitude. """ return self._interpolate_parameter("GLAT_Err", glon)
[docs] def evaluate(self, position): """Evaluate model at a given position. Parameters ---------- position : `~astropy.coordinates.SkyCoord` Position on the sky. """ glon, glat = position.galactic.l, position.galactic.b width = self.width(glon) amplitude = self.peak_brightness(glon) mean = self.peak_latitude(glon) return Gaussian1D.evaluate(glat, amplitude=amplitude, mean=mean, stddev=width)