Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004assl..315..155s&link_type=abstract
How Does the Galaxy Work? A Galactic Tertulia with Don Cox and Ron Reynolds. Edited by Emilio J. Alfaro, Instituto de Astrofica
Astronomy and Astrophysics
Astrophysics
Scientific paper
Observations of the x-ray diffuse background suggest that a significant fraction of the volume of the Galaxy contains low-density million-degree gas. Large-scale angular structures seen in x-ray all-sky surveys imply the existence of at least three nearb y bubbles of hot gas, Sco-Cen, Orion-Eridanus, and Mono-Gem, in addition to x-ray emitting gas located in the local cavity. The near-isotropy of the high-latitude x-ray background in the 0.5 — 1 keVrange away from identified bubbles is consistent with a large-scale-height few-million-degree x-ray emitting halo or emission from the intragroup medium of the Local Group. Absorption features seen in the x-ray background angular distribution in the 0.1 - 0.28 keV range also place some irregular regions of l ower temperature gas in the halo. In this brief review, I will summarize our knowledge of these hot regions.
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