Beyond the Limit of Deep X-ray Surveys: Galaxies or AGN?

Details Beyond the Limit of Deep X-ray Surveys: Galaxies or AGN? Beyond the Limit of Deep X-ray Surveys: Galaxies or AGN?

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..380..179g&link_type=abstract

At the Edge of the Universe: Latest Results from the Deepest Astronomical Surveys ASP Conference Series, Vol. 380, proceedings o

Astronomy and Astrophysics

Astronomy

Scientific paper

We show that we can detect the ensemble emission from normal elliptical, spiral and irregular galaxies out to redshifts approaching one, and that these galaxies dominate the faint number counts below the discrete detection limits of the current deep surveys. The average X-ray luminosities can then be compared with the results of models of the evolution in the numbers of X-ray binaries and can possibly be used to constrain models of star formation. In order to account for the increasing luminosity of spiral galaxies from low to moderate redshift, AGN components may need to be invoked.

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