3C 273 - X-ray variability, spectrum, and position

Details 3C 273 - X-ray variability, spectrum, and position 3C 273 - X-ray variability, spectrum, and position

May 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...230l...5b&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 230, May 15, 1979, p.L5-L9.

Astronomy and Astrophysics

Astronomy

29

Quasars, Radiant Flux Density, Variability, X Ray Sources, X Ray Spectroscopy, Collimators, Emittance, Galactic Nuclei, Heao 1, Position (Location), Seyfert Galaxies, X Ray Astronomy

Scientific paper

Observations of the X-ray source associated with 3C 273 have been carried out from 1.3 to 13.3 keV with the scanning modulation collimator on HEAO 1, yielding several precise positions (0.42 sq arcmin), one of which includes 3C 273. The data show an increase in flux by a factor of at least 3 in 6 months. A substantial low-energy (1.3-2.6 keV) flux during the higher state yields a hydrogen column density of less than 2 x 10 to the 22nd per sq cm and removes a possible X-ray distinction between quasars and other extragalactic nuclei, viz., Seyfert type 1 and BL Lacertae objects. The 90-GHz radio flux decreased during this period (1978.0-1978.5), and the optical flux exhibited increased variability after several years of relative quiescence.

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