AGN Heating of Galaxy Groups

Details AGN Heating of Galaxy Groups AGN Heating of Galaxy Groups

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21342431m&link_type=abstract

American Astronomical Society, AAS Meeting #213, #424.31; Bulletin of the American Astronomical Society, Vol. 41, p.251

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the results of a deep search for fossil radio emission in a sample of X-ray luminous galaxy groups, NGC 383, with "radio-loud” central sources. The data include new 235 and 610 MHz observations from the GMRT as well as archival data at 327 MHz from the VLA. Our goal is to directly measure the amount of energy that has been injected into the intragroup medium by individual active galactic nuclei (AGN) over the last 100-200Myr and compare it with the energy input by star formation as measured from H-alpha observations. We compare the radio luminosity to the amount of excess non-gravitational heating implied by the groups’ X-ray properties. With our low frequency observations we show that AGN feedback must deposit significant amounts of energy into the intergalactic medium in galaxy groups.

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