NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-18 T03:58:45 PDT
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For refcode 1994ApJ...436L..41M:
Retrieve 5 NED objects in this reference.
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Copyright by American Astronomical Society. Reproduced by permission
1994ApJ...436L..41M DETECTIONS OF HARD X-RAY EMISSIONS FROM BRIGHT EARLY-TYPE GALAXIES WITH ASCA K. MATSUSHITA, K. MAKISHIMA, H. AWAKI, C. R. CANIZARES, A. C. FABIAN, Y. FUKAZAWA, M. LOEWENSTEIN, H. MATSUMOTO, T. MIHARA, R. F. MUSHOTZKY, T. OHASHI, G. R. RICKER, P. J. SERLEMITSOS, T. TSURU, Y. TSUSAKA, AND T. YAMAZAKI Received 1994 June 2; accepted 1994 August 29 ABSTRACT Five bright elliptical galaxies in the Virgo Cluster, NGC 4365, NGC 4374 (M84), NGC 4406 (M86), NGC 4472 (M49), and NGC 4636, were observed with ASCA. In addition to the extended thermal X-ray emission of temperature kT~1 keV, harder X-rays with color temperature kT >= 2 keV were detected from all of them. The 2-10 keV luminosities of this hard component for the five galaxies, integrated within 5', are distributed within a relatively narrow range of (1-4) x 10^40^ ergs s^-1^. The hard X-ray component is primarily attributed to the integrated emission from discrete X-ray sources. In NGC 4406 and NGC 4374 the data indicate that the hard component is contributed additionally by foreground/background emission from the hot intracluster medium (ICM) of the Virgo Cluster. The hard component of NGC 4472 seems also contributed by the Virgo ICM emission, but in this case there is evidence that the ICM brightness is locally enhanced within ~10' of NGC 4472. Subject headings: galaxies: clusters of - galaxies: elliptical and lenticular, cD - X-rays: galaxies - X-rays:ISM
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