X-ray spectrum of the spiral galaxy M51 (NGC 5194)

Details X-ray spectrum of the spiral galaxy M51 (NGC 5194) X-ray spectrum of the spiral galaxy M51 (NGC 5194)

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...365..159m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 365, Dec. 10, 1990, p. 159-163.

Astronomy and Astrophysics

Astronomy

24

Active Galactic Nuclei, Spiral Galaxies, X Ray Sources, X Ray Spectra, Astronomical Satellites, Astronomical Spectroscopy, Seyfert Galaxies, Spaceborne Astronomy, Star Formation, X Ray Binaries

Scientific paper

From an about 1 sq deg sky region containing the spiral galaxy M51 (NGC 5194), an X-ray flux of (1.1 + or - 0.6) x 10 to the -11th ergs/s/sq cm was detected with the Ginga observatory in the 2-20 keV band. The observed spectrum is very hard and bears no low-energy absorption. It can be fitted either with a power-law model of photon index alpha = 1.43 + or - 0.08, or a thermal bremsstrahlung model of temperature kT over 28 keV. The emission, presumably coming from M51 itself, infers a 2-20 keV luminosity of (1.2 + or - 0.6) x 10 to the 41st ergs/s at the source distance of 9.6 Mpc. It is suggested that a significant fraction of the observed X-ray emission originates in a weak Seyfert-like nucleus of M51.

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