X-ray observations of the Seyfert 1 galaxy Markarian 464

Details X-ray observations of the Seyfert 1 galaxy Markarian 464 X-ray observations of the Seyfert 1 galaxy Markarian 464

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...380..357p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 380, Oct. 20, 1991, p. 357-361. Research supported by ASI.

Astronomy and Astrophysics

Astronomy

6

Markarian Galaxies, Satellite Observation, Seyfert Galaxies, X Ray Sources, Astronomical Spectroscopy, Exosat Satellite, X Ray Astronomy, X Ray Spectra

Scientific paper

Results of Exosat and hard X-ray balloon observations of the Seyfert 1 galaxy Mrk 464 are presented. The spectrum observed with Exosat is well fitted by a power law with a photon spectral index of 1.70 +/-0.15, which is in agreement with a previous measurement by HEAO 1A-2. The absorption column density is found to be consistent with the galactic column density. Both the Exosat and the HEAO 1 upper limit (less than 10 exp 22/sq cm) are in disagreement with the very high column density of 2.5 x 10 exp 23/sq cm observed by Ariel 5. The XG-81 experiment detected a bright hard X-ray source in a field of view centered on Mrk 464. It is argued that this measurement is due to an outburst of this Seyfert galaxy, with a peak luminosity one order of magnitude greater than the average one.

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