The X-ray emitting galaxy Cen-A

Details The X-ray emitting galaxy Cen-A The X-ray emitting galaxy Cen-A

Oct 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977stin...7734092m&link_type=abstract

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Astronomy and Astrophysics

Astronomy

Galaxies, X Ray Sources, X Ray Spectra, Hydrogen Clouds, Oso-8, Radio Sources (Astronomy), X Ray Astronomy, X Ray Fluorescence

Scientific paper

OSO-8 X-ray observations of Cen-A in 1975 and 1976 are reported. The source spectrum is well fit in both years by a power law of number index 1.62 and absorption due to 1.3 x 10 to the 23rd power at/sq cm. The total flux varied by a factor 2 between 1975 and 1976. In 1976 there were approximately 40% flux variations on a time scale of days. The 6.4 keV Fe fluorescent line and the 7.1 keV absorption edge were measured implying Fe/H approximately equals .000016. Simultaneous radio measurements show variation in phase with X-ray variability. Models considering radio, milimeter, IR and X-ray data show that all the data can be accounted for by a model in which the X-rays are due to a synchrotron self-Compton source embedded in a cold H(2) cloud.

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