A Survey Of X-ray Cavities In Elliptical Galaxies

Details A Survey Of X-ray Cavities In Elliptical Galaxies A Survey Of X-ray Cavities In Elliptical Galaxies

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.5211f&link_type=abstract

American Astronomical Society Meeting 208, #52.11; Bulletin of the American Astronomical Society, Vol. 38, p.133

Astronomy and Astrophysics

Astronomy

Scientific paper

X-ray emitting gas in the centers of galaxy clusters and in some elliptical galaxies does not appear to be cooling at the rate expected from simple theory, suggesting a heating mechanism is present. To test whether active galactic nuclei (AGN) can provide the needed heat through cavities they inflate in the gas, a sample of 102 elliptical galaxies was searched for cavities. The cavity heating rate was calculated for the 12 systems that contained detectable X-ray surface brightness depressions and compared to the power radiated from the region where the cooling tims was shorter than 5 Gyr. Cavity heating could account for observed radiative losses in 11 of the 12 systems, although these results still need to be corrected for the AGN "duty cycle".

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