Using Cluster Gas Fractions to Estimate Total BH Mechanical Feedback Energy

Details Using Cluster Gas Fractions to Estimate Total BH Mechanical Feedback Energy Using Cluster Gas Fractions to Estimate Total BH Mechanical Feedback Energy

Aug 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011scgg.conf...32m&link_type=abstract

"Structure in Clusters and Groups of Galaxies in the Chandra Era, 2011 Chandra Science Workshop held July 12-14, 2011. Edited by

Computer Science

Scientific paper

The total mechanical feedback energy received by clusters of mass 4-11 × 10^{14} M_{sun} exceeds 10^{63} ergs and mean feedback luminosity 10^{46} erg/s. This can be estimated by comparing gas density profiles in idealized adiabatic clusters evolved to zero redshift with entropy and gas fraction profiles in clusters of the same mass. Feedback energy, stored as potential energy in the cluster gas, can be estimated by comparing the PE within the same gas mass in adiabatic and observed atmospheres which have expanded considerably. The total feedback energy far exceeds energy gained by supernovae or lost by radiation. Less than 1% of the feedback energy is deposited within the cooling radius, but the time-averaged mass inflow from cooling is nicely offset by outflow due to feedback expansion.

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