Diffuse X-Ray Emission from the Supergiant Shell Large Magellanic CLOUD-4 Detected with ROSAT

Details Diffuse X-Ray Emission from the Supergiant Shell Large Magellanic CLOUD-4 Detected with ROSAT Diffuse X-Ray Emission from the Supergiant Shell Large Magellanic CLOUD-4 Detected with ROSAT

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...283l..21b&link_type=abstract

Astronomy and Astrophysics, Vol. 283, NO. 3/MAR(III), P. L21, 1994

Astronomy and Astrophysics

Astrophysics

36

Scientific paper

Diffuse X-ray emission originating inside LMC 4, the largest supergiant shell in the LMC, has been detected in a pointed ROSAT PSPC observation. This is the first detection of a well-defined supergiant shell in X-rays and the first time that a background-free spectrum of hot gas originating from inside a supergiant shell has been derived. The spectrum can be attributed to emission from a thin thermal plasma of a temperature of 2.4 x 10^6^ K. We have derived surface brightness, electron density, and pressure of the hot gas and investigated the evolutionary state of the supergiant shell. We find LMC 4 to be aged while the hot plasma inside still has significant overpressure compared to the surrounding gas. Implications of our results for the LMC and supergiant shells in other galaxies are discussed.

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