3C 109: an obscured X-ray luminous quasar?
Open Access
- 1 September 1992
- journal article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 258 (1) , 29P-32P
- https://doi.org/10.1093/mnras/258.1.29p
Abstract
We present the first X-ray spectrum of the active galaxy 3C 109 obtained with the Position Sensitive Proportional Counter on ROSAT. 3C 109 is one of the most intrinsically luminous sources within a redshift z = 0.5, having a 0.1–2.4 keV luminosity of 5.6 × 1045 erg s−1 which is comparable to that of 3C 273. The X-ray spectrum is affected by absorption in excess of the Galactic value derived from H I observations, at a level in good agreement with the reddening implied by optical data. Although classified as a radio galaxy, the intrinsic properties of 3C 109 closely resemble those of luminous steep-spectrum radio quasars. Our result supports unification schemes for active galaxies which hypothesize that luminous radio galaxies and radio-loud quasars are the same population of objects viewed at different angles.Keywords
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