Nonthermal X-ray emission from 3C 273 - The core of a knotty problem?

Details Nonthermal X-ray emission from 3C 273 - The core of a knotty problem? Nonthermal X-ray emission from 3C 273 - The core of a knotty problem?

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...349...41d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 349, Jan. 20, 1990, p. 41-44. Research supported by CNR.

Astronomy and Astrophysics

Astrophysics

8

Cosmic X Rays, Emission Spectra, Quasars, Astronomical Spectroscopy, Heao 1, Telescopes, X Ray Spectra

Scientific paper

The quasar 3C 273 was observed in the hard X-ray region of the spectrum (15-300 keV) during a stratospheric balloon flight on July 15, 1987. The emitted photon spectrum is well described by a single power law of photon index -1.61 which corresponds to a hard (20-200 keV) X-ray luminosity of 0.8 x 10 to the 47th ergs/s. This flux is consistent with the 1978/1979 HEAO 1 and AIT/MPI measurements and about a factor of three below the high state measured in 1981 (AIT/MPI). The implications of these results with respect to the location of the production site and mechanism are discussed.

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