University of Cambridge > Talks.cam > Galaxies Discussion Group >  Non-gravitational entropy and energy `profiles' in clusters - Implications for AGN feedback and Pre-heating

Non-gravitational entropy and energy `profiles' in clusters - Implications for AGN feedback and Pre-heating

Add to your list(s) Download to your calendar using vCal

If you have a question about this talk, please contact Martin Haehnelt.

Non-gravitational feedback affects the nature of the intracluster medium (ICM). X-ray cooling of the ICM and in situ energy feedback from active galactic nuclei (AGNs) and supernovae, as well as pre-heating of the gas at epochs preceding the formation of clusters, are proposed mechanisms for such feedback. I will present the non-gravitational entropy injection profiles and resulting non-gravitational energy feedback profiles, of the intra-cluster medium for a large sample of clusters using data SZ (Planck) and X-Ray(ROSAT) observations, from deep inside cluster cores up to r200. This is the first estimate of ‘feedback profiles’ (and not only the mean feedback energy per particle) from observations. Estimate of the non-gravitational energy in the cluster cores and their correlation with radio observations (NRAO/VLA) strongly point at AGN (in situ) feedback. Moreover, we show that for the sample as a whole and throughout the entire radial range, the non-gravitational entropy/energy profiles conclusively rule all ICM pre-heating scenarios. We demonstrate the robustness of our results w.r.t sample selection, X-Ray analysis procedures, non-radiative entropy modelling. Time permitting, I will also demonstrate a new scheme for identifying cool vs non-cool core clusters.

This talk is part of the Galaxies Discussion Group series.

Tell a friend about this talk:

This talk is included in these lists:

Note that ex-directory lists are not shown.

 

© 2006-2024 Talks.cam, University of Cambridge. Contact Us | Help and Documentation | Privacy and Publicity