AGN Feedback on the Intracluster Medium

Details AGN Feedback on the Intracluster Medium AGN Feedback on the Intracluster Medium

2002-10-18

arxiv.org/abs/astro-ph/0210431v1

Astrophys.J. 581 (2002) L1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, uses AASTeX and emulateapj5.sty

Scientific paper

10.1086/345890

Galaxy groups are quite underluminous in X-rays compared to clusters, so the intracluster medium has to be considerably underdense in the former. We consider this to be due to substantial energy fed back into the ICM when the baryons in the member galaxies condense into stars ending up in SNe, or accrete on to central supermassive black holes energizing AGNs. We compute the outflow and the blowout effects driven by the AGNs and the resulting, steep luminosity-temperature correlation L_X-T. We compare this with the SN contribution and with the X-ray data; the latter require the AGN energy to be coupled to the surrounding ICM at fractional levels around 5 10^{-2}. We link the L_X-T behavior with the parallel effects of the AGN feedback on the gas in the host galaxy; we find that these yield a correlation steep up to M_{\bullet}\propto \sigma^5 between the galactic velocity dispersions and the central BH masses.

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