X-ray observations to detect hot coronae around galaxies

Details X-ray observations to detect hot coronae around galaxies X-ray observations to detect hot coronae around galaxies

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...263..564b&link_type=abstract

Astrophysical Journal, Part 1, vol. 263, Dec. 15, 1982, p. 564-570.

Astronomy and Astrophysics

Astronomy

51

Coronas, Cosmic Gases, Spiral Galaxies, Supernovae, X Ray Astronomy, Heao 2, High Temperature Gases, Point Sources, Proportional Counters, Spaceborne Astronomy, X Ray Sources

Scientific paper

X-ray observations were made of two nearby edge-on spiral galaxies with the Imaging Proportional Counter (IPC) on the Einstein Observatory in an effort to detect hot (1,000,000 K), gaseous galactic coronae. No diffuse emission from galactic coronae was detected. Upper limits to diffuse emission (0.3-2.9 keV) are 10 to the 39th ergs/sec (NGC 3628) and 2 x 10 to the 38th ergs/sec (NGC 4244). The measurements indicate that less than 1/1000 of the energy supplied by supernovae in these galaxies appears as soft X-rays. The energy from supernovae may be radiated away by cool gas (less than 600,000 K) whose emission is undetectable by the Einstein Observatory, or the energy may be carried away by a hot wind (10,000,000 K) which radiates inefficiently. Serendipitous X-ray sources from the two IPC fields are listed.

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