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

Published online by Cambridge University Press:  12 May 2006

Richard E. Griffiths ,
Takamitsu Miyaji ,
Adam Knudson  and
Matthew Schurch
Richard E. Griffiths
Affiliation:
Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213, USA email: [email protected]
Takamitsu Miyaji
Affiliation:
Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213, USA email: [email protected]
Adam Knudson
Affiliation:
Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213, USA email: [email protected]
Matthew Schurch
Affiliation:
Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213, USA email: [email protected]
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Abstract

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The great sensitivities of the Chandra X-ray Observatory and XMM-Newton are allowing us to explore the X-ray emission from galaxies at moderate to high redshift. By using the stacking method with CXO data, we show that we can detect the ensemble emission from normal elliptical, spiral and irregular galaxies out to redshifts approaching one. The average X-ray luminosity 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.

Keywords

X-ray backgroundgalaxiesnumber countsX-ray binariesAGN
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Symposium S230: Populations of High Energy Sources in Galaxies , August 2005 , pp. 438 - 441
Copyright
2006 International Astronomical Union