The temperature of hot gas halos of early-type galaxies

Details The temperature of hot gas halos of early-type galaxies The temperature of hot gas halos of early-type galaxies

2011-06-15

arxiv.org/abs/1106.2898v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

16 pages, accepted for publication in ApJ

Scientific paper

Recently, the temperature T and luminosity L_X of the hot gas halos of early type galaxies have been derived with unprecedented accuracy from Chandra data, for 30 galaxies covering a wider range of galactic luminosity (and central velocity dispersion sigma_c) than before. This work investigates the origin of the observed temperatures, by examining the relationship between them and the galaxy structure, the gas heating due to Type Ia supernovae (SNIa's) and the gravitational potential, and the dynamical status of the gas flow. In galaxies with sigma_c<200 km/s, the T's are close to a fiducial average temperature for the gas when in outflow; at 200

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