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Astron. Astrophys. 335, 443-448 (1998)

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Research Note

Multiwavelength observations of 26W20, a radio galaxy which displays BL Lacertae characteristics

J.D. Silverman 1, D.E. Harris 1 and W. Junor 2

1 Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
2 Department of Physics and Astronomy, University of New Mexico, 800 Yale Blvd., NE, Albuquerque, NM 87131, USA

Received 18 December 1997 / Accepted 17 April 1998

Abstract

26W20 , a radio galaxy located at a projected distance of 2.2 Mpc from the center of Abell 754 (z=0.054) exhibits core emission properties similar to those of a BL Lac object. New radio observations and VLA archival data show parsec scale features in the core ([FORMULA] ergs s-1) with a flat spectrum. From observations with ROSAT, we demonstrate that the X-ray core emission [FORMULA] ergs s-1) is non-thermal and variable. An 18% increase in the X-ray luminosity was observed in two observations separated by five days. The optical morphology is that of a large, normal elliptical galaxy ([FORMULA] and the optical spectrum lacks strong emission lines. If the innermost segment of the radio jet is close to our line of sight, Doppler boosting could explain both the observed X-ray intensity and the absence of emitting line regions.

Key words: radio continuum: galaxies – X-rays: galaxies – BL Lacertae objects: individual: 26W20 – galaxies: jets

Send offprint requests to: D.E. Harris

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© European Southern Observatory (ESO) 1998

Online publication: June 18, 1998
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