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29 March 2024
 
  » arxiv » astro-ph/0604583

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Filaments, Bubbles, and Weak Shocks in the Gaseous Atmosphere of M87
W. Forman ; E.Churazov ; C. Jones ; M. Markevitch ; P. Nulsen ; A. Vikhlinin ; M. Begelman ; H. Bohringer ; J. Eilek ; S. Heinz ; R. Kraft ; F. Owen ;
Date 27 Apr 2006
AbstractWe present the first results from a 500 ksec Chandra ACIS-I observation of M87. At soft energies (0.5-1.0 keV), we detect a complex filamentary structure associated with the eastern and southwestern arms. Many filaments are spatially resolved and have widths of ~300 pc. This filamentary structure is particularly striking in the eastern arm where we suggest the filaments are outer edges of a series of buoyant bubbles filled with relativistic plasma, produced by the central supermassive black hole, in a succession of small outbursts occurring every ~6 x 10^6 years. The X-ray structures may be influenced by magnetic filamentation. At hard energies (3.5-7.5 keV), we detect a nearly circular shell of outer radius 2.8’ (13 kpc). This ring of hard X-ray emission provides an unambiguous signature of a weak shock, driven by an outburst from the SMBH, traversing the M87 atmosphere. The observed spectral hardening corresponds to a temperature rise from 2.0 to 2.4 keV, which translates to a Mach number M~1.2 for monoatomic gas with gamma=5/3. In addition, we detect two additional surface brightness edges (at radii of ~0.6’ and ~1.2’). The ~0.6’ feature may be the gas just outside the ``piston’’ driving the 2.8’ shock, while the ~1.2’ feature is probably produced by a secondary outburst.
Source arXiv, astro-ph/0604583
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