Two hard X-ray sources in the central region of the Virgo cluster

Details Two hard X-ray sources in the central region of the Virgo cluster Two hard X-ray sources in the central region of the Virgo cluster

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pasj...43....1t&link_type=abstract

Astronomical Society of Japan, Publications (ISSN 0004-6264), vol. 43, no. 1, 1991, p. 1-8.

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22

Elliptical Galaxies, Seyfert Galaxies, Virgo Galactic Cluster, X Ray Sources, Active Galactic Nuclei, Luminosity, X Ray Spectra

Scientific paper

Two hard X-ray sources were detected in the central region of the Virgo cluster of galaxies: the giant elliptical galaxy M87 and the Seyfert 2 galaxy NGC 4388. The brighter source is NGC 4388, which has a power-law spectrum with a photon index of about 1.3 and 10-20 keV luminosity of (2.0 + or - 0.2) x 10 to the 42nd erg/sec. M87, the second source, has a larger photon index than does NGC 4388, and its luminosity was estimated to be (6.9 + or - 1.2) x 10 to the 41st erg/sec in the 10-20 keV band. No other source nor diffuse hard X-ray emission larger than 1 deg was found.

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