ROSAT observations of spiral galaxies

Details ROSAT observations of spiral galaxies ROSAT observations of spiral galaxies

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adspr..16..155p&link_type=abstract

Advances in Space Research (ISSN 0273-1177), vol. 16, no. 3, p. 155-158

Astronomy and Astrophysics

Astronomy

2

Active Galaxies, Point Sources, Rosat Mission, Spiral Galaxies, X Ray Astronomy, X Ray Sources, Energy Spectra, Galactic Halos, Interstellar Gas, Luminosity, Supernova Remnants

Scientific paper

Results of ROSAT observations of nearby spiral galaxies are discussed. All galaxies show emission from point-like sources (X-ray binaries, super-soft sources, supernova remnants, supernovae short after outburst). For some active galaxies, nuclear point-like sources (starburst or Seyfert like nuclei) and/or extended nuclear emision from million K gas has been detected in disk and/or halo of some galaxies. Thereby, hot halo emission is not only demonstrated in galaxies that are known for activity from observations in other wavelength regimes. Due to the long cooling times of 108 - 109 years the X-ray emitting halo gas may be a fossil sign for shorter-lived activity of a galaxy. The dectection of an X-ray halo of the Milky way may argue for a more active of the Galaxy in the past.

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