X-ray Number Counts for NuSTAR and Other Hard X-ray Imaging Missions

Details X-ray Number Counts for NuSTAR and Other Hard X-ray Imaging Missions X-ray Number Counts for NuSTAR and Other Hard X-ray Imaging Missions

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011head...12.4306b&link_type=abstract

American Astronomical Society, HEAD meeting #12, #43.06

Astronomy and Astrophysics

Astronomy

Scientific paper

Finding and characterizing the population of active galactic nuclei (AGNs) that produces the X-ray background (XRB) is necessary to connect the history of accretion to observations of galaxy evolution at longer wavelengths. The year 2012 will see the deployment of the first hard X-ray imaging telescope that, through deep extragalactic surveys, will be able to measure the AGN population at the energies where the XRB peaks ( 20-30 keV). Here, we present predictions of AGN number counts in two hard X-ray bandpasses: 6-10 keV and 10-30 keV. Separate predictions are presented for the number counts of Compton thick AGNs, the most heavily obscured active galaxies. The number counts are calculated for five different models of the XRB that differ in the assumed hard X-ray luminosity function, the evolution of the Compton thick AGNs, and the underlying AGN spectral model. The majority of the hard X-ray number counts will be Compton thin AGNs, but there is a >10× increase in the Compton thick number counts from the 6-10 keV to the 10-30 keV band. The Compton thick population show enough variation that a hard X-ray number counts measurement will constrain the models. The computed number counts are used to consider various survey strategies for the NuSTAR mission. We find that multiple surveys will allow a measurement of Compton thick evolution.

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