Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-07-22
Astrophys.J.693:43-55,2009
Astronomy and Astrophysics
Astrophysics
12 pages, 11 colour figures, ApJ accepted. Expanded discussion, results unchanged
Scientific paper
10.1088/0004-637X/693/1/43
We present a two-dimensional analysis of the bright nearby galaxy group NGC 5044 using the currently available Chandra and XMM data. In the inner 10 kpc a pair of cavities are evident together with a set of bright X-ray filaments. If the cavities are interpreted as gas displaced by relativistic plasma inflated by an AGN, even in the absence of extended 1.4 GHz emission, this would be consistent with a recent outburst as also indicated by the extent of dust and H_alpha emission. The soft X-ray filaments coincident with H_alpha and dust emission are cooler than the ones which do not correlate with optical and infrared emission. We suggest that dust-aided cooling contributes to form warm (T =10^4 K) gas, emitting H_alpha radiation. At 31 kpc and 67 kpc a pair of cold fronts are present, indicative of sloshing due to a dynamical perturbation caused by accretion of a less massive group, also suggested by the peculiar velocity of the brightest galaxy NGC 5044 with respect to the mean group velocity.
Brighenti Fabrizio
Buote David A.
Ettori Stefano
Gastaldello Fabio
Mathews William G.
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