Radio images of the microquasar GRS 1758-258

¹ Departamento de Física, Escuela Politécnica Superior, Universidad de Jaén, Virgen de la Cabeza 2, 23071 Jaén, Spain
² Instituto de Astrofísica de Andalucía, CSIC, Spain
³ CEA/DSM/DAPNIA/Service d'Astrophysique, Centre d'Études de Saclay, 91191 Gif-Sur-Yvette, France e-mail: mirabel@discovery.saclay.cea.fr
⁴ Instituto de Astronomía y Física del Espacio, C.C. 67, Suc. 28, 1428 Buenos Aires, Argentina
⁵ Instituto de Astronomía, UNAM, Campus Morelia, Apdo. Postal 3-72, 58089 Morelia, Michoacán, México e-mail: l.rodriguez@astrosmo.unam.mx
⁶ Department of Physics & Astronomy – MS 108, Rice University, 6100 South Main Street, Houston, TX 77005-1892, USA e-mail: ian@spacsun.rice.edu

Corresponding author: J. Martí, jmarti@ujaen.es

Received: 3 December 2001
Accepted: 14 February 2002

Abstract

We present sensitive images of the microquasar GRS 1758-258 at two different radio wavelengths. The positions, flux densities and spectral indices of the central source and the extended radio lobes are reported. Our results confirm the synchrotron nature of the radio lobes. We also present a very deep radio image of the jet flow at arcminute scales. The source VLA-C, previously proposed as the exciting source of the system, is found to coincide with the Chandra position.