JFactory

class gammapy.astro.darkmatter.JFactory(geom, profile, distance, annihilation=True)

Bases: object

Compute J-Factor or D-Factor maps.

J-Factors are computed for annihilation and D-Factors for decay. Set the argument annihilation to False to compute D-Factors. The assumed dark matter profiles will be centered on the center of the map.

Parameters:

geomWcsGeom

Reference geometry.

profileDMProfile

Dark matter profile.

distanceQuantity

Distance to convert angular scale of the map.

annihilation: bool, optional

Decay or annihilation. Default is True.

Methods Summary

compute_differential_jfactor([ndecade])	Compute differential J-Factor.
compute_jfactor([ndecade])	Compute astrophysical J-Factor.

Methods Documentation

compute_differential_jfactor(ndecade=10000.0)

Compute differential J-Factor.

\[\frac{\mathrm d J_\text{ann}}{\mathrm d \Omega} = \int_{\mathrm{LoS}} \mathrm d l \rho(l)^2\]

\[\frac{\mathrm d J_\text{decay}}{\mathrm d \Omega} = \int_{\mathrm{LoS}} \mathrm d l \rho(l)\]

compute_jfactor(ndecade=10000.0)

Compute astrophysical J-Factor.

\[J(\Delta\Omega) = \int_{\Delta\Omega} \mathrm d \Omega^{\prime} \frac{\mathrm d J}{\mathrm d \Omega^{\prime}}\]