X-ray AGN space density

X-ray AGN space density calculator

This tool computes the intrinsic volume density of different AGN populations as a function of redshift. The AGN absorption, luminosity and redshift intervals can be specified in the form below. The output volume density is returned in ASCII format in units of [Mpc^-3] comoving.

A concordance cosmology with Ω_m=0.3, Ω_Λ=0.7, H₀=70 km/s/Mpc is assumed.

Please fill ALL fields to make the tool work properly. Click on the parameter names for help on valid ranges.


redshift min   :    (minimum redshift)
 
redshift max   :    (maximum redshift)
 
log NH min     :     (log minimum column density in cm^-2)

log NH max     :     (log maximum column density in cm^-2)

high-z decline :    (apply a decline to the high-z AGN XLF)

log L min      :    (log minimum intrinsic luminosity, 0.5-2 keV, in erg/s^*)

log L max      :    (log maximum intrinsic luminosity, 0.5-2 keV, in erg/s^*)
 

Press this button to continue:  (Queries may take from seconds to minutes depending on the adopted cuts.)
To reset the form press this button: 


*) NOTE: logL(0.5-2 keV) = logL(2-10 keV) - 0.13 for an intrinsic power law spectrum with Γ=1.9. 
To compute space densities in any desired range of hard, 2-10 keV luminosities LH1 and LH2, 
simply put LH1-0.13 and LH2-0.13 in the form.

Please refer to Gilli, Comastri, Hasinger (2007, A&A, 463, 79) for a full description of the XRB synthesis model used in this calculator.

Contacts: roberto.gilli

Last modified: 24 Apr 2020