Help page for the online calculators

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Band

Energy band in which the AGN counts are computed.

S min, max

Flux interval in the chosen energy band over which the AGN counts are computed.

E min, max

Energy bounds of the output CXB spectrum, in keV. Valid entries are between 0.1 and 1000 keV.

log N_H min, max

Absorption range (logarithms of the column density N_H/cm^-2 are used). Valid entries are between 20 and 26, in steps of 1 (i.e. 20, 21, 22, 23, 24, 25, 26). A few examples showing how to get the contribution from different AGN classes are listed below:

    class             log NH min      log NH max

Unabsorbed                20              21 

Absorbed Compton thin     21              24 

Absorbed Compton thick    24              26 

Mildly Compton thick      24              25 

Heavily Compton thick     25              26 

redshift min, max

Redshift interval. Valid entries for z_min and z_max are between 0 and 10. Results for very narrow intervals (z_max - z_min < 0.05) may be inaccurate.

high-z decline

Two options are available for the evolution of AGN at high redshift. In the first option ( NO ), the XLF evolves as parameterized by Eqs. 8,9 and 10 of Hasinger, Miyaji & Schmidt (2005, A&A, 441, 417; HMS05). This produces a mild decline of the AGN number density as a function of redshift as shown in Fig. 5a of HMS05. In the second option ( YES ), the XLF described above is multiplied by a steeper decline term at redshifts above 2.7 parameterized following Schmidt, Schneider & Gunn (1995, AJ, 110, 68): XLF_YES = XLF_NO * exp(2.7-z).

log L min, max

Logarithmic luminosity interval. Input values must be 0.5-2 keV rest frame, de-absorbed luminosities in units of erg/s. Entries can be extended even beyond the range logL=42-48 used by Gilli, Comastri, Hasinger (2007, A&A, 463, 79)

Contacts: roberto.gilli