The X-ray emitting galaxy Centaurus A

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

Mar 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...220..790m&link_type=abstract

Astrophysical Journal, Part 1, vol. 220, Mar. 15, 1978, p. 790-797.

Astronomy and Astrophysics

Astronomy

87

Astronomical Spectroscopy, Emission Spectra, Galactic Radiation, Radio Sources (Astronomy), X Ray Sources, Abundance, Iron, Line Spectra, X Ray Spectra

Scientific paper

OSO-8 X-ray observations of Cen A in 1975 and 1976 are reported. The source spectrum can be well fitted in both years by a power law of number index 1.66 and absorption due to 1.3 by 10 to the 23rd power atoms/sq cm. The total flux varied by a factor of 2 between 1975 and 1976. In 1976 there were flux variations of approximately 40% on a time scale of days. Measurements of the 6.4-keV Fe fluorescent line and the 7.1-keV absorption edge imply Fe/H of approximately 0.000016. Simultaneous radio measurements show variation in phase with X-ray variability. Consideration of radio, millimeter, infrared, and X-ray data shows 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 H2 cloud.

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