The X-ray Evolution of Early-Type Galaxies in the Extended Chandra Deep Field-South

Details The X-ray Evolution of Early-Type Galaxies in the Extended Chandra Deep Field-South The X-ray Evolution of Early-Type Galaxies in the Extended Chandra Deep Field-South

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20922505l&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #225.05; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

We investigate the evolution over the last 6.3 Gyr of cosmic time (i.e., since z = 0.7) of the average X-ray properties of early-type galaxies within the Extended Chandra Deep Field-South (E-CDF-S). We utilize the deep Chandra observations over the E-CDF-S and X-ray stacking analyses to constrain primarily the average X-ray emission from normal early-type galaxies (i.e., those that are not dominated by luminous active galactic nuclei [AGNs]). We study separately optically luminous (L_B = 10^10-10^11 L_B,sol) and faint (L_B = 10^9.3-10^10 L_B,sol) samples of early-type galaxies, which are expected to have 0.5-2.0 keV emission dominated by hot interstellar gas and low mass X-ray binaries (LMXBs), respectively. For our optically luminous early-type galaxies, we find that the average X-ray power output has not evolved significantly since z = 0.7, indicating there must be a general balance between the heating and cooling of the hot interstellar gas over this redshift range. If such a balance is maintained as a result of AGN feedback, then on average 1-5% of the bolometric AGN output would go into heating the hot gas. For our optically faint early-type galaxies, we find suggestive evidence for a rise in average X-ray power with redshift, possibly due to global changes in LMXB populations with redshift; however, due to relatively low numbers of sources, we consider this result to be marginal at present.

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