Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998stin...9958163r&link_type=abstract
Technical Report, Colorado Univ. Boulder, CO United States Joint Inst. for Lab. Astrophysics
Astronomy and Astrophysics
Astronomy
Elliptical Galaxies, X Ray Astronomy, Background Radiation, Radio Galaxies, Bl Lacertae Objects, Rosat Mission, X Ray Timing Explorer, Intergalactic Media, Virgo Galactic Cluster
Scientific paper
We present hard X-ray observations of the nearby radio galaxy M87 and the core of the Virgo cluster using the Rossi X-ray 7Tming Explorer. These are the first hard X-ray observations of M87 not affected by contamination from the nearby Seyfert 2 galaxy NGC 4388. Thermal emission from Virgo's intracluster medium is clearly detected and has a spectrum indicative of kT is approximately equal to 2.5 keV plasma with approximately 25% cosmic abundances. No non-thermal (power-law) emission from M87 is detected in the hard X-ray band, with fluctuations in the Cosmic X-ray Background being the limiting factor. Combining with ROSAT data, we infer that the X-ray spectrum of the M87 core and jet must be steep (Gamma core > 1.90 and Gamma jet > 1.75), and we discuss the implications of this result. In particular, these results are consistent with M87 being a mis-aligned BL-Lac object.
Begelman Mitchell C.
Fabian Andrew C.
Heinz Sebastian
Reynolds Christopher S.
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