Detections of hard X-ray emissions from bright early-type galaxies with ASCA

Details Detections of hard X-ray emissions from bright early-type galaxies with ASCA Detections of hard X-ray emissions from bright early-type galaxies with ASCA

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...436l..41m&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 436, no. 1, p. L41-L45

Astronomy and Astrophysics

Astrophysics

102

Brightness, Elliptical Galaxies, Spectrum Analysis, Thermal Emission, Virgo Galactic Cluster, X Ray Sources, Brightness Temperature, Interstellar Matter, X Ray Imagery

Scientific paper

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 approximately 1 keV, harder X-rays with color temperature kT greater than or equal to 2 keV were detected from all of them. The 2-10 keV luminosities of this hard component for the five galaxies, integrated within 5 min, are distributed within a relatively narrow range of (1-4) x 1040 ergs/s. 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 approximately 10 min of NGC 4472.

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