Multi-frequency study of the B3 VLA sample

IV. 74-MHz flux densities from VLA A-array data

¹ INAF – Istituto di Radioastronomia, via Gobetti 101, 40129 Bologna, Italy e-mail: mack@ira.cnr.it
² Radioastronomisches Institut der Universität Bonn, Auf dem Hügel 71, 53121 Bonn, Germany
³ Dipartimento di Fisica, Università di Bologna, via Irnerio 46, 40126 Bologna, Italy
⁴ Sterrewacht Leiden, Postbus 9513, 2300 RA Leiden, The Netherlands
⁵ International SKA Project Office, Postbus 2, 7990 AA Dwingeloo, The Netherlands

Received: 28 December 2004
Accepted: 15 February 2005

Abstract

We present 74-MHz data of 365 B3 VLA sources, which were obtained as a by-product of the observations of Tschager et al. (2003, A&A, 402, 171) who observed a large area of sky with the VLA in A-array. Apart from the lowest-frequency observations of B3 VLA sources performed so far contributing to our on-going multi-frequency study of this survey, these A-array data also provide the first morphological information at this low frequency. The most intriguing result is the discovery of two new Giant Radio Galaxy candidates, B3 1232+397B at a redshift of 3.22 and B3 1419+419 at a redshift of 0.367. This means that B3 1232+397B would be the most distant GRG known to date. At the same time, these two objects are two new examples of sources with recurrent activity. Our results give a foretaste of the impact which extremely low-frequency radio continuum observations will have for the study of source evolution.