AGN Heating vs Cooling in Giant Elliptical Galaxies

Details AGN Heating vs Cooling in Giant Elliptical Galaxies AGN Heating vs Cooling in Giant Elliptical Galaxies

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008head...10.2505n&link_type=abstract

American Astronomical Society, HEAD meeting #10, #25.05

Astronomy and Astrophysics

Astronomy

Scientific paper

Outbursts from an active galactic nucleus (AGN) at the center of a hot, X-ray emitting, atmosphere can have a major impact on the individual atmosphere. For a sample of nearby giant elliptical galaxies, we compare the total power radiated by their hot atmospheres to the energy injected by AGN outbursts. Averaged over the sample, AGN energy input is sufficient to make up for radiative losses. If AGN outbursts occur intermittently in all of the galaxies, AGN heating would be sufficient to prevent cooling and star formation in their hot atmospheres. The coincidence between average outburst power and cooling rate provides a strong argument that the two are coupled, i.e., that AGN feedback is primarily responsible for limiting star formation in these systems.

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