ROSAT observations of the two radio-selected blazars PKS 1034-293 and PKS 1335-127

Details ROSAT observations of the two radio-selected blazars PKS 1034-293 and PKS 1335-127 ROSAT observations of the two radio-selected blazars PKS 1034-293 and PKS 1335-127

Apr 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...443...29m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 443, no. 1, p. 29-34

Astronomy and Astrophysics

Astronomy

3

Bl Lacertae Objects, Quasars, Radio Observation, X Ray Astronomy, X Ray Spectra, Broadband, Heao 2, Optical Thickness, Rosat Mission, Spectral Energy Distribution

Scientific paper

ROSAT observations of two blazars are presented. Spectral fits with a single absorbed power law with free nH yield gamma = 1.23+0.54-0.50 nH = 1.3+1.7-1.2 1020/sq cm, for PKS 1034-293 and gamma = 2.29+0.55-0.51 nH = 6.60+3.00-2.23 1020/sq cm, for PKS 1335-127, respectively. For the first source, the derived column density is significantly smaller than the Galactic value, suggesting a soft excess. A fit with a broken law, with nH fixed at the Galactic value, yields a concave spectrum. Alternatively, the concavity can be modeled with an absorption edge or notch superposed on a steeper continuum. Reanalysis of the Einstein observations of the two sources, with nH fixed at the value determined by ROSAT, yields a very flat Einstein X-ray slope for PKS 1034-293, Gamma = 0.83+0.68-0.90 consistent with the ROSAT result, while for PKS 1335-127 the Einstein slope, Gamma = 1.36+0.48-0.53 is flatter than that determined with ROSAT. A comparison of the X-ray spectra with the broadband energy distributions suggests that in both cases a significant contribution from a process other than synchrotron, most likely inverse Compton, is present in the X-ray band.

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