PSF3D

class gammapy.irf.PSF3D(energy_axis_true, offset_axis, rad_axis, psf_value, energy_thresh_lo=<Quantity 0.1 TeV>, energy_thresh_hi=<Quantity 100. TeV>, interp_kwargs=None)

Bases: object

PSF with axes: energy, offset, rad.

Data format specification: PSF_TABLE

Parameters

energy_axis_trueMapAxis

True energy axis.

offset_axisMapAxis

Offset axis

rad_axisMapAxis

Rad axis

psf_valueQuantity

PSF (3-dim with axes: psf[rad_index, offset_index, energy_index]

energy_thresh_loQuantity

Lower energy threshold.

energy_thresh_hiQuantity

Upper energy threshold.

Attributes Summary

energy_axis_true
offset_axis
rad_axis
tag

Methods Summary

containment_radius(energy[, theta, …])	Containment radius.
evaluate([energy, offset, rad])	Interpolate PSF value at a given offset and energy.
from_table(table)	Create PSF3D from Table.
peek([figsize])	Quick-look summary plots.
plot_containment([fraction, ax, add_cbar])	Plot containment image with energy and theta axes.
plot_containment_vs_energy([fractions, …])	Plot containment fraction as a function of energy.
plot_psf_vs_rad([theta, energy])	Plot PSF vs rad.
read(filename[, hdu])	Create PSF3D from FITS file.
to_energy_dependent_table_psf([theta, rad, …])	Convert PSF3D in EnergyDependentTablePSF.
to_hdulist()	Convert PSF table data to FITS HDU list.
to_table_psf(energy[, theta])	Create TablePSF at one given energy.
write(filename, *args, **kwargs)	Write PSF to FITS file.

Attributes Documentation

energy_axis_true

offset_axis

rad_axis

tag = 'psf_table'

Methods Documentation

containment_radius(energy, theta='0 deg', fraction=0.68, interp_kwargs=None)

Containment radius.

Parameters

energyQuantity

Energy

thetaAngle

Offset in the field of view. Default theta = 0 deg

fractionfloat

Containment fraction. Default fraction = 0.68

Returns

radiusQuantity

Containment radius in deg

evaluate(energy=None, offset=None, rad=None)

Interpolate PSF value at a given offset and energy.

Parameters

energyQuantity

energy value

offsetAngle

Offset in the field of view

radAngle

Offset wrt source position

Returns

valuesQuantity

Interpolated value

classmethod from_table(table)

Create PSF3D from Table.

Parameters

tableTable

Table Table-PSF info.

peek(figsize=(15, 5))

Quick-look summary plots.

plot_containment(fraction=0.68, ax=None, add_cbar=True, **kwargs)

Plot containment image with energy and theta axes.

Parameters

fractionfloat

Containment fraction between 0 and 1.

add_cbarbool

Add a colorbar

plot_containment_vs_energy(fractions=[0.68, 0.95], thetas=<Angle [0., 1.] deg>, ax=None, **kwargs)

Plot containment fraction as a function of energy.

plot_psf_vs_rad(theta='0 deg', energy=<Quantity 1. TeV>)

Plot PSF vs rad.

Parameters

energyQuantity

Energy. Default energy = 1 TeV

thetaAngle

Offset in the field of view. Default theta = 0 deg

classmethod read(filename, hdu='PSF_2D_TABLE')

Create PSF3D from FITS file.

Parameters

filenamestr

File name

hdustr

HDU name

to_energy_dependent_table_psf(theta='0 deg', rad=None, exposure=None)

Convert PSF3D in EnergyDependentTablePSF.

Parameters

thetaAngle

Offset in the field of view

radAngle

Offset from PSF center used for evaluating the PSF on a grid. Default is the rad from this PSF.

exposureQuantity

Energy dependent exposure. Should be in units equivalent to ‘cm^2 s’. Default exposure = 1.

Returns

table_psfEnergyDependentTablePSF

Energy-dependent PSF

to_hdulist()

Convert PSF table data to FITS HDU list.

Returns

hdu_listHDUList

PSF in HDU list format.

to_table_psf(energy, theta='0 deg', **kwargs)

Create TablePSF at one given energy.

Parameters

energyQuantity

Energy

thetaAngle

Offset in the field of view. Default theta = 0 deg

Returns

psfTablePSF

Table PSF

write(filename, *args, **kwargs)

Write PSF to FITS file.

Calls writeto, forwarding all arguments.