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.

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