ROSAT observations of the blazar PKS 0537-441

Details ROSAT observations of the blazar PKS 0537-441 ROSAT observations of the blazar PKS 0537-441

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...406..447t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 406, no. 2, p. 447-450.

Astronomy and Astrophysics

Astrophysics

32

Bl Lacertae Objects, Rosat Mission, Spectral Energy Distribution, X Ray Sources, Electron Density (Concentration), Exosat Satellite, Gamma Rays, Heao 2, Spectrophotometry, Visual Photometry

Scientific paper

X-ray observations of PKS 0537-441 obtained with ROSAT in April 1991, together with a reexamination of the previous EXOSAT data, are reported. The hydrogen column density N(H) = (3.0 +/- 1.3) x 10 exp 20/sq cm is consistent with that deduced from 21-cm observations. Optical spectrophotometry of February 1991 indicates a moderately high state of the source. The observations are also discussed in the light of the newly discovered gamma-ray emission.

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