Computer Science
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cfdd.confe..84d&link_type=abstract
Chandra's First Decade of Discovery, Proceedings of the conference held 22-25 September, 2009 in Boston, MA. Edited by Scott Wo
Computer Science
Galaxies
Scientific paper
A Chandra observation of the X-ray bright group NGC 5044 shows that the central X-ray emitting gas has been strongly perturbed by recent AGN outbursts and by motion of the central galaxy relative to the group gas. The NGC 5044 group hosts many small radio quiet cavities with a nearly isotropic distribution, cool filaments, a semi-circular cold front and a two-armed spiral shaped feature of cool gas. A 610 MHz GMRT observation reveals the presence of extended emission with a ``torus-shaped'' morphology. The largest X-ray filament appears to thread the radio torus, suggesting that the lower entropy gas within the filament is being uplifted from the center of the group. The 235 MHz radio emission is much more extended than the 610 MHz emission, with little overlap between the two frequencies. One component of the 235 MHz emission passes through the largest X-ray cavity and is then deflected just behind the cold front. A second detached radio lobe is also detected beyond the cold front. All of the smaller X-ray cavities in the center of NGC 5044 are undetected in the GMRT observations. Since the smaller bubbles are probably no longer momentum driven by the central AGN, their motion will be affected by the group weather as they buoyantly rise outward. Hence, most of the enthalpy within the smaller bubbles will likely be deposited near the group center and isotropized by the group weather. Interior to the cold front there are several clouds of high abundance gas which probably arise from uplifted SNeIa enriched material. Beyond the cold front, there are several arc-like streams of metal enriched gas which may be the disrupted remains of the high abundance clouds which are only exposed to the group weather once they have been uplifted beyond the cold front.
David Laurence
Forman William
Jones Christine
Nulsen Paul E. J.
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