ROSAT high-resolution X-ray observations of the galaxies M 51 and NGC 5195

Details ROSAT high-resolution X-ray observations of the galaxies M 51 and NGC 5195 ROSAT high-resolution X-ray observations of the galaxies M 51 and NGC 5195

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...295..289e&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 295, no. 2, p. 289-301

Astronomy and Astrophysics

Astronomy

41

Diffuse Radiation, Emission Spectra, Galactic Halos, Interstellar Matter, Point Sources, X Ray Astronomy, X Ray Sources, X Ray Spectra, Electron Density (Concentration), Faraday Effect, Interstellar Magnetic Fields, Rosat Mission

Scientific paper

X-ray observations of M 51 and its companion using the ROSAT High Resolution Imager (HRI) reveal diffuse and point-like X-ray emission from both galaxies with (0.1-2.4 keV) X-ray luminosities Lx = 4.4 x 1040 erg/s and 0.7 x 1040 erg/s, respectively. Eight point sources are detected in M 51 superimposed onto the diffuse emission of the galactic halo. The nuclear area of M 51 is a bright extended X-ray source due to hot, outflowing gas coincident with the radio emission of the jet and the southern extranuclear cloud. The companion, NGC 5195, also shows extended emission and at least one other point-like source. NGC 5195 is connected to M 51 by a bridge of diffuse X-ray emission. If the energy densities of magnetic fields and hot gas with a volume filling factor eta in the halo of M 51 are comparable, then we find from an electron density of 2.6 x 10-3 x eta-1/2/cu cm a reasonable magnetic field strength of 6.3 x eta-1/4 microgauss. Some peaks of diffuse X-ray emission coincide with regions of anomalous Faraday depolarization in radio continuum, indicating that the distribution of the hot gas is influenced by magnetic fields. A hot halo may contribute to the depolarization.

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