"The Huge Plasma Cap" Created by a Large Explosion of a Galaxy

Details "The Huge Plasma Cap" Created by a Large Explosion of a Galaxy "The Huge Plasma Cap" Created by a Large Explosion of a Galaxy

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007asthe.100..378t&link_type=abstract

The Astronomical Herald (ISSN 0374-2466), Vol. 100, No. 8, p. 378 - 384 (2007)

Astronomy and Astrophysics

Astronomy

Starburst Galaxies, M82

Scientific paper

Starburst galaxies inject a large amount of kinetic and thermal energy into intergalactic space via outflows enriched with heavy metals synthesized in the massive stars that result in supernova explosions. The extended X-ray emission from "the Cap" region located 11' (11.6 kpc) above the disk of the starburst galaxy M82 has been observed with Suzaku. Precise analyses of the Suzaku data and XMM-Newton archival data were conducted. The metal abundances of O, Ne, Mg, Si, and Fe in this region has been determined for the first time. Their metal abundance ratios agree well with those of metal-poor stars and the model prediction of metals synthesized by type-II supernovae, which supports the idea that the origin of the metals in the Cap is type-II supernovae explosions occuring in the starburst regions in the M82 galaxy. The possible contributions from sputtered dust grains to the metals in the Cap is discussed. An emission line consistent with the C VI transition of n = 4 ti 1 at 0.459 keV is marginally detected, although it is not statistically significant at the 99% confidence level; the presence of this line would suggest charge-exchange processes in the Cap.

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