1304.5478 (F. Gastaldello et al.)

Sloshing cold fronts in galaxy groups and their perturbing disk galaxies: an X-ray, Optical and Radio Case Study    [PDF]

F. Gastaldello, L. Di Gesu, S. Ghizzardi, S. Giacintucci, M. Girardi, E. Roediger, M. Rossetti, F. Brighenti, D. A. Buote, D. Eckert, S. Ettori, P. J. Humphrey, W. G. Mathews

We present a combined X-ray, optical, and radio analysis of the galaxy group IC 1860 using the currently available Chandra and XMM data, literature multi-object spectroscopy data and GMRT data. The Chandra and XMM imaging and spectroscopy reveal two surface brightness discontinuities at 45 and 76 kpc shown to be consistent with a pair of cold fronts. These features are interpreted as due to sloshing of the central gas induced by an off-axis minor merger with a perturber. This scenario is further supported by the presence of a peculiar velocity of the central galaxy IC 1860 and the ide

View original: http://arxiv.org/abs/1304.5478