SourceCatalogHGPS#
- class gammapy.catalog.SourceCatalogHGPS(filename='$GAMMAPY_DATA/catalogs/hgps_catalog_v1.fits.gz', hdu='HGPS_SOURCES')[source]#
Bases:
gammapy.catalog.core.SourceCatalogHESS Galactic plane survey (HGPS) source catalog.
Reference: https://www.mpi-hd.mpg.de/hfm/HESS/hgps/
One source is represented by
SourceCatalogObjectHGPS.Examples
Let’s assume you have downloaded the HGPS catalog FITS file, e.g. via:
curl -O https://www.mpi-hd.mpg.de/hfm/HESS/hgps/data/hgps_catalog_v1.fits.gz
Then you can load it like this:
>>> import matplotlib.pyplot as plt >>> from gammapy.catalog import SourceCatalogHGPS >>> filename = '$GAMMAPY_DATA/catalogs/hgps_catalog_v1.fits.gz' >>> cat = SourceCatalogHGPS(filename)
Access a source by name:
>>> source = cat['HESS J1843-033'] >>> print(source) *** Basic info *** Catalog row index (zero-based) : 64 Source name : HESS J1843-033 Analysis reference : HGPS Source class : Unid Identified object : -- Gamma-Cat id : 126 *** Info from map analysis *** 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 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 % *** Info from spectral analysis *** 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 *** Flux points info *** Number of flux points: 6 Flux points table: e_ref e_min e_max dnde dnde_errn dnde_errp dnde_ul is_ul TeV TeV TeV 1 / (TeV s cm2) 1 / (TeV s cm2) 1 / (TeV s cm2) 1 / (TeV s cm2) ------ ------ ------ --------------- --------------- --------------- --------------- ----- 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 *** Gaussian component info *** Number of components: 2 Spatial components : HGPSC 083, HGPSC 084 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 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 *** Source associations info *** 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
Access source spectral data and plot it:
>>> ax = plt.subplot() >>> source.spectral_model().plot(source.energy_range, ax=ax) >>> source.spectral_model().plot_error(source.energy_range, ax=ax) >>> source.flux_points.plot(ax=ax)
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')
Attributes Summary
Source catalog description (str).
Large scale component model as a
SourceCatalogLargeScaleHGPSobject.Source positions as a
SkyCoordobject.Source association table as a
Table.Gaussian component table as a
Table.Source identification table as a
Table.Large scale component table as a
Table.Source catalog name (str).
Methods Summary
gaussian_component(row_idx)Gaussian component as a
SourceCatalogObjectHGPSComponentobject.row_index(name)Look up row index of source by name.
source_name(index)Look up source name by row index.
to_models([which, components_status])Create Models object from catalog.
Attributes Documentation
- description = 'H.E.S.S. Galactic plane survey (HGPS) source catalog'#
Source catalog description (str).
- large_scale_component#
Large scale component model as a
SourceCatalogLargeScaleHGPSobject.
- tag = 'hgps'#
Source catalog name (str).
Methods Documentation
- gaussian_component(row_idx)[source]#
Gaussian component as a
SourceCatalogObjectHGPSComponentobject.
- row_index(name)#
Look up row index of source by name.
- Parameters
- namestr
Source name.
- Returns
- indexint
Row index of source in table.
- source_name(index)#
Look up source name by row index.
- Parameters
- indexint
Row index of source in table.
- to_models(which='best', components_status='independent')[source]#
Create Models object from catalog.
- Parameters
- which{‘best’, ‘pl’, ‘ecpl’}
Which spectral model.
- components_status{‘independent’, ‘linked’, ‘merged’}
- Relation between the sources components. Available options are:
‘independent’: each subcomponent of a source is given as a different
SkyModel(Default).‘linked’: each subcomponent of a source is given as a different
SkyModelbut the spectral parameters except the normalisation are linked.‘merged’: the subcomponents are merged into a single
SkyModelgiven as aTemplateSpatialModelwith aPowerLawNormSpectralModel. In that case the relative weights between the components cannot be adjusted.
- Returns
- models
Models Models of the catalog.
- models