High Temperature Gas in Low Excitation Filaments in M87

Details High Temperature Gas in Low Excitation Filaments in M87 High Temperature Gas in Low Excitation Filaments in M87

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21543615s&link_type=abstract

American Astronomical Society, AAS Meeting #215, #436.15; Bulletin of the American Astronomical Society, Vol. 42, p.386

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Scientific paper

Material at intermediate temperature between the hot X-ray emitting coronal gas at the centers of galaxy clusters, and the much cooler optical line emitting filaments, yields information on transport processes and plausible scenarios for the relationship between X-ray "cool cores” and other phenomena such as mergers or an active galactic nucleus. Hitherto, detection of intermediate temperature gas has proven elusive. Here, we show strong evidence for extensive CIV 1549 Å emission, which arises in gas at temperature 105 K, co-located with the "low excitation” Hαλπηα+[NII] 104K emission filaments of M87. We infer that the hot and cool phases are in thermal communication, and that quantitatively the emission strength is consistent with thermal conduction from the coronal X-ray gas. Thermal conduction may account for many of the observed characteristics of cool core galaxy clusters.

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