SIGMA observations of the Virgo cluster

Details SIGMA observations of the Virgo cluster SIGMA observations of the Virgo cluster

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...264...22l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 264, no. 1, p. 22-24.

Astronomy and Astrophysics

Astronomy

19

Elliptical Galaxies, Gamma Ray Telescopes, Radio Sources (Astronomy), Seyfert Galaxies, Virgo Galactic Cluster, X Ray Sources, Astronomical Spectroscopy, Ginga Satellite, Luminosity, X Ray Spectra

Scientific paper

The Virgo cluster has been observed 10 times by the hard X-ray/soft gamma-ray telescope SIGMA for a total of about 130 useful hours. It is found that M87 is not visible at hard X-ray energies nor any of the well known X-ray and radio sources (M86, M84, NGC4438), except the Seyfert 2 galaxy NGC 4388 close to the limit of visibility (2.2 x 10 exp-5 ph/sq cm s keV at 3 sigma at 60 keV). Together with previous observations, our result implies that NGC4388 is variable and can account alone for the whole cluster emission above 40 keV.

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