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Astron. Astrophys. 348, 699-704 (1999)


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Restarting activity in the giant radio galaxy J1835+620

L. Lara *  1, I. Márquez[FORMULA]  1, W.D. Cotton 2, L. Feretti 3, G. Giovannini 3,4, J.M. Marcaide 5 and T. Venturi 3

1 Instituto de Astrofísica de Andalucía (CSIC), Apdo. 3004, E-18080 Granada, Spain
2 National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903-2475, USA
3 Istituto di Radioastronomia (CNR), via P. Gobetti 101, I-40129 Bologna, Italy
4 Dipartamento di Fisica, Universitá di Bologna, via B. Pichat 6/2, I-40127 Bologna, Italy
5 Departamento de Astronomía, Universitat de València, E-46100 Burjassot, Spain

Received 10 May 1999 / Accepted 14 June 1999

Abstract

We present radio and optical observations of the peculiar radio galaxy J1835+620, a member of a new sample of large angular size radio galaxies selected from the NRAO VLA Sky Survey. Its optical counterpart is in a group of at least three galaxies and shows strong, narrow emission lines which allow us to measure its redshift as [FORMULA]. The derived cosmological distance places J1835+620 among the giant radio galaxies. The outstanding aspect of J1835+620 at radio wavelengths is the existence of two symmetric bright components within a typical Fanaroff-Riley type II structure. We interpret the source as the result of two distinct phases of core activity. Radio maps and radio polarization properties are consistent with a dense new ejection evolving through an older underlying jet. We suggest that interaction with nearby galaxies could be the reason for restarting the activity in J1835+620.

Key words: galaxies: active – galaxies: individual: J1835+620 – galaxies: jets – radio continuum: galaxies

* Visiting Astronomer, German-Spanish Astronomical Center, Calar Alto, operated by the Max-Planck-Institut fur Astronomie jointly with the Spanish National Commission for Astronomy

Send offprint requests to: L. Lara

© European Southern Observatory (ESO) 1999

Online publication: August 13, 199

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