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Astron. Astrophys. 330, 67-71 (1998)

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X-ray and optical study of the giant radio quasar 4C +74.26

W. Brinkmann 1, C. Otani 2, S.J. Wagner * 3 and J. Siebert 1

1 Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse, D-85740 Garching, Germany
2 Cosmic Radiation Laboratory, RIKEN, Wako-shi, Saitama 351-01, Japan
3 Landessternwarte, Königstuhl, D-69117 Heidelberg, Germany

Received 26 June 1997 / Accepted 15 September 1997


We present the optical and X-ray study of the radio-loud quasar 4C +74.26. The ASCA spectrum is rather complex with indications of a reflection component, a neutral iron line and a warm absorber. The underlying power law has a photon index of [FORMULA]. The soft X-ray flux in 1996 is nearly twice as high as that found in a ROSAT observation in 1993 without apparent spectral changes.

The X-ray data support the picture deduced from previous radio observations that 4C +74.26 is seen under a relative large angle ([FORMULA]) with respect to its jet axis. However, the rather unusual X-ray spectral properties might as well be a signature of the quasar's young evolutionary status.

No interaction between the quasar and the nearby [FORMULA] mag galaxy could be found in the optical images.

Key words: galaxies: active – quasars: general – quasars: individual 4C+74.26 – X-rays: general

* Visiting astronomer at the German-Spanish Astronomical Centre, Calar Alto, operated by the Max-Planck-Institut für Astronomie, Heidelberg, jointly with the Spanish National Commission for Astronomy

Send offprint requests to: W. Brinkmann

© European Southern Observatory (ESO) 1998

Online publication: January 8, 1998