Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...20517802p&link_type=abstract
American Astronomical Society Meeting 205, #178.02; Bulletin of the American Astronomical Society, Vol. 37, p.381
Astronomy and Astrophysics
Astronomy
Scientific paper
Both Active Galactic Nuclei (AGN) and stellar processes contribute to the X-ray emission of active galaxies, and there are indications that the relative importance of these two processes may have evolved with redshift. However, our understanding of this evolution is limited by our ability to identify the signatures of AGN and star formation in distant galaxies. The X-ray spatial and spectral complexity readily observable in the local universe is frequently compressed into only two parameters---an X-ray luminosity and a hardness ratio---in surveys of high-redshift galaxies. In the interest of testing the ability of these two parameters to identify AGN and star formation, we present hardness ratios and X-ray luminosities of a sample of Chandra observations of well-studied, nearby, obscured active galaxies that have been artificially redshifted to z=0.3. In "redshifting" the galaxies, we have accounted for changes to the Chandra instrumental response in addition to changes to the received X-ray light from the galaxies.
This work was made possible by Chandra X-ray Center grant G03-4137.
Gallagher Sarah C.
Hornschemeier Ann Elizabeth
Muno Michael P.
Peterson Kelly C.
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