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- W1993417145 abstract "view Abstract Citations (18) References (52) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS ROSAT Observations of Blazars from a Polarized Radio-selected Sample Maraschi, L. ; Fossati, G. ; Tagliaferri, G. ; Treves, A. Abstract We have observed with ROSAT six blazars from the sample of 31 polarized objects constructed by Impey & Tapia (1988). Results of the spectral analysis in the ROSAT band of three objects, PKS 0301 -243, PKS 1055+018, and PG 1424+240 are presented here and compared with the three previously published objects. Using a simple power-law model with free absorption a wide range of spectral slopes is found, from 0.2 to 2.2 in the energy spectral index α_x_. Objects with emission lines have flatter X-ray spectra than lineless objects. Indication of spectral curvature within the X-ray band is found in the sense of a concavity (soft excess) for the flattest spectrum and a convexity (soft deficiency) for the steepest one. The X-ray spectral shape is discussed in relation to the overall energy distribution for the six objects. The results are compared with other samples of blazars. The X-ray spectral index, α_x_, is found to be anticorrelated with the broadband spectral index α_RO_ and with bolometric luminosity and redshift. It is suggested that the different spectra of quasar-like and BL Lac-like blazars represent extremes in a continuous distribution rather than two distinct populations. Publication: The Astrophysical Journal Pub Date: April 1995 DOI: 10.1086/175550 arXiv: arXiv:astro-ph/9412002 Bibcode: 1995ApJ...443..578M Keywords: Active Galaxies; Bl Lacertae Objects; Curve Fitting; Goodness Of Fit; Polarized Electromagnetic Radiation; Quasars; X Ray Astronomy; X Ray Spectra; Computer Programs; Correlation; Exosat Satellite; Heao 2; Luminosity; Red Shift; Rosat Mission; Sky Surveys (Astronomy); Astrophysics; GALAXIES: BL LACERTAE OBJECTS: INDIVIDUAL ALPHANUMERIC: PKS 0301-243; GALAXIES: BL LACERTAE OBJECTS: INDIVIDUAL ALPHANUMERIC: PG 1424+240; GALAXIES: ACTIVE; GALAXIES: INDIVIDUAL ALPHANUMERIC: PKS 1055+018; X-RAYS: GALAXIES; Astrophysics E-Print: 24 pages, uuencoded tar-compressed PostScript file including figures, to appear in The Astrophysical Journal. Send all Comments, questions, requests, etc. to: fossati@astmiu.mi.astro.it full text sources arXiv | ADS | data products SIMBAD (6) NED (6) HEASARC (1)" @default.
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- W1993417145 title "ROSAT observations of blazars from a polarized radio-selected sample" @default.
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