The survival and destruction of X-ray coronae of early-type galaxies in the rich cluster environments: a case study of Abell 1367

Details The survival and destruction of X-ray coronae of early-type galaxies in the rich cluster environments: a case study of Abell 1367 The survival and destruction of X-ray coronae of early-type galaxies in the rich cluster environments: a case study of Abell 1367

2004-08-24

arxiv.org/abs/astro-ph/0408425v1

Astrophys.J. 619 (2005) 169-177

Astronomy and Astrophysics

Astrophysics

11 pages, 7 figures, emulateapj5, accepted by ApJ

Scientific paper

10.1086/425298

A new Chandra observation of the northwest region of the galaxy cluster A1367 reveals four cool galaxy coronae (0.4 - 1.0 keV) embedded in the hot intracluster medium (ICM) (5 - 6 keV). While the large coronae of NGC 3842 and NGC 3837 appear symmetric and relaxed, the galaxy coronae of the $\lsim$ L* galaxies (NGC 3841 and CGCG 97090) are disturbed and being stripped. Massive galaxies, with dense cooling cores, are better able to resist ram pressure stripping and survive in rich environments than $\lsim$ L* galaxies whose galactic coronae are much less dense. The survival of these cool coronae implies that thermal conduction from the hot surrounding ICM has to be suppressed by a factor of at least 60, at the corona boundary. Within the galaxy coronae of NGC 3842 and NGC 3837, stellar mass loss or heat conduction with the Spitzer value may be sufficient to balance radiative cooling. Energy deposition at the ends of collimated jets may heat the outer coronae, but allow the survival of a small, dense gas core (e.g., NGC 3842 in A1367 and NGC 4874 in Coma). The survived X-ray coronae become significantly smaller and fainter with the increasing ambient pressure.

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