UCSD OSO-7 observations of the hard X-ray spectrum and variability of Centaurus A

Details UCSD OSO-7 observations of the hard X-ray spectrum and variability of Centaurus A UCSD OSO-7 observations of the hard X-ray spectrum and variability of Centaurus A

May 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...206l..45m&link_type=abstract

Astrophysical Journal, vol. 206, May 15, 1976, pt. 2, p. L45-L48.

Other

22

Satellite Observation, Variable Stars, X Ray Sources, Bremsstrahlung, Energy Spectra, Oso-7, X Ray Spectra

Scientific paper

Results are reported for four X-ray scans of the region containing Cen A. It is found that the X-ray source had a hard number spectrum (spectral index of -1.2) during these observations and that the intensity in the range from 10 to 100 keV apparently increased by 230% with no detectable change in spectral shape between two observations 210 days apart. Either a Compton-synchrotron mechanism or thermal bremsstrahlung at any temperature greater than 200 keV is suggested as the source of the X-rays. It is noted that the present observations, together with a similar detection of another galaxy, may establish a distinct class of extragalactic X-ray objects with flat and highly absorbed spectra.

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