The high energy X-ray spectrum of 3C 273

Details The high energy X-ray spectrum of 3C 273 The high energy X-ray spectrum of 3C 273

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...136..351b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 136, no. 2, July 1984, p. 351-354. Sponsorship: Deutsche Forschungsgemeinschaf

Astronomy and Astrophysics

Astrophysics

49

Astronomical Spectroscopy, Quasars, X Ray Sources, X Ray Spectra, Compton Effect, Data Reduction, Spectral Energy Distribution

Scientific paper

The quasar 3C 273 was observed in the hard X-ray range (18 - 240 keV) with a balloon-borne detector on 1981 September 28. The source was found to be quite strong and to emit a very hard spectrum. The photon number spectrum is well described by a single power law of index α = -1.2, with no apparent break or cut-off. The integrated hard X-ray luminosity (20 - 200 keV) is 1.2×1047erg s-1. Compared to other observations in 1978/79 this corresponds to an increase in luminosity (18 - 240 keV) by a factor of three, representing the first observation of time variability of 3C 273 in this energy range. The authors briefly discuss this behaviour with respect to Synchrotron-self-Compton and thermal Comptonization models.

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