X-ray and UV observations of two radio-bright quasars

Details X-ray and UV observations of two radio-bright quasars X-ray and UV observations of two radio-bright quasars

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...280...91e&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 280, May 1, 1984, p. 91-97.

Astronomy and Astrophysics

Astronomy

22

Astronomical Spectroscopy, Quasars, Ultraviolet Astronomy, X Ray Sources, Heao 2, Iue, Lyman Spectra

Scientific paper

The two quasars PKS 10004 + 13 (4C 13.41, V about equal to 15.2, z = 0.140) and PKS 0637 - 75 (V = 15.75, z = 0.651) were observed in December 1980 with IUE. Both were detected in the short-wavelength region. The present X-ray upper limit for PKS 1004 + 13 gives the lowest L-x/L-opt measured in quasars. PKS 0637 - 75 was observed nearly simultaneously with the Einstein Observatory and a spectrum obtained with the IPC. The UV and soft X-ray data have been combined and are discussed together with the optical and infrared data for both objects. The extreme L-x/L-opt ratio of PKS 1004 + 13 may be the result of an exceptionally large blackbody UV excess superposed on a power-law continuum of slope about 1.1. An alternative would be a large hydrogen column absorbing low-energy X-rays although this is unlikely. PKS 0637 - 75 shows no evidence for any UV excess. The two quasars seem to be at opposite ends of the degree of dominance of the UV spectrum by a blackbody component. The lack of a Lyman limit discontinuity in PKS 0637 - 75 at the redshift of an intervening galaxy implies that the optically detected, intervening hydrogen is ionized.

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