The effect of non--gravitational gas heating in groups and clusters of galaxies

Simple item page
dc.creatorBorgani, S.
dc.creatorGovernato, F.
dc.creatorWadsley, J.
dc.creatorMenci, N.
dc.creatorTozzi, P.
dc.creatorQuinn, T.
dc.creatorStadel, J.
dc.creatorLake, G.
dc.date2002-05-27
dc.date.accessioned2026-07-07T12:00:50Z
dc.date.available2026-07-07T12:00:50Z
dc.descriptionWe present a set of gas-dynamical simulations of galaxy groups and clusters aimed at exploring the effect of non-gravitational heating. We use GASOLINE, a parallel Tree+SPH code, to simulate the formation of four cosmic halos with temperature 0.5<T<8 keV. Non-gravitational heating is implemented in two different ways: (1) by imposing a minimum entropy floor at a given redshift, 1<z<5; (2) by gradually heating gas, proportionally to the SN rate expected from semi-analytical modeling of galaxy formation. Our main results are the following. (a) An extra heating energy of about 1 keV per gas particle is required to reproduce the observed Lx-T relation, independent of whether it is provided so as to create an entropy floor of 50-100 keV cm^2, or is modulated in redshift; our SN feedback recipe provides only 1/3 keV/part. (b) The M-T relation is almost unaffected by non-gravitational heating and follows the M T^{3/2} scaling, with a normalization ~40% higher than observed, independent of the heating scheme. The inclusion of cooling in a run of a small group has the effects of increasing T_ew by ~30%, possibly reconciling simulated and observed M-T relations, and of decreasing Lx by ~40%. In spite of the inclusion of SN feedback energy, almost 40% of the gas becomes cold, in excess of current observational estimates. (abridged)
dc.description18 pages, 15 figures, to appear in MNRAS. Version with high resolution images available at http://www.daut.univ.trieste.it/borgani/LT/lt_1.ps.gz
dc.identifierhttps://arxiv.org/abs/astro-ph/0205471
dc.identifierhttp://arxiv.org/abs/astro-ph/0205471
dc.identifierMon.Not.Roy.Astron.Soc.336:409,2002
dc.identifierdoi:10.1046/j.1365-8711.2002.05746.x
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/206917
dc.subjectAstrophysics
dc.titleThe effect of non--gravitational gas heating in groups and clusters of galaxies
dc.typetext

Files

Collections

arXiv