Detection of type-2 quasars in the radio galaxies B3 0731+438 and 3C 257

(2) NAO; (3) NASDA; Astronomy; Japan; Japan); J.N. Reeves (1); M. Imanishi (2); M.J. Ward (1); P.M. Derry (1); P.T. O'Brien (1)

arxiv: astro-ph/0304550 · v1 · submitted 2003-04-30 · 🌌 astro-ph

Detection of type-2 quasars in the radio galaxies B3 0731+438 and 3C 257

P.M. Derry (1) , P.T. O'Brien (1) , J.N. Reeves (1) , M.J. Ward (1) , M. Imanishi (2) , S. Ueno (3) ((1) Dept. of Physics , Astronomy , University of Leicester

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(2) NAO Japan (3) NASDA Japan)

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keywords galaxieshighlyquasarsradiospectraltype-2absorbedabsorption

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We present XMM-Newton observations and spectral fitting of two highly redshift, [OIII]-luminous, narrow-line radio galaxies, B3 0731+438 and 3C 257. Their X-ray continua are well fitted by a partial covering model with intrinsically unabsorbed and absorbed powerlaw components. The spectral models indicate that both objects harbour highly obscured nuclei, with N_H ~ 0.5 - 2 x 10^23 cm^-2. Correcting for this absorption we find large intrinsic luminosities in the range L_X ~ 0.2 - 1 x 10^45 erg/s. Thus, both sources are type-2 quasars.

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Detection of type-2 quasars in the radio galaxies B3 0731+438 and 3C 257

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