Search and analysis techniques for extended sources in deep radio surveys

Abstract

We produced a search for extended radio sources in the LOFAR Two Meter Survey HETDEX Spring Field, and we were able to identify 17 low-brightness sources in a region of 9:5 8:7 , an area of the sky between RA: 10h37m00s to 11h48m00s and DEC: 44 1900000 to 52 5500000. We focus in this study on the poorly studied radio galaxy PGC2285791 presenting a detailed analysis of its core, of the two extended radio lobes, a spectral index map between 141 and 1400 MHz and its multi-frequency association with an IR and optical counterparts. Our results led to the identi cation of this source with a z = 0:14 extended ( 6 arcmin in the S-N direction) radio galaxy with bubble- like radio lobe structures and a morphological similarity in the extended radio structure of PGC2285791 with the remnant radio galaxy B20924+30, except PGC2285791 has a prominent radio core. Future X-ray and millimeter observations will greatly help in understanding the energetics of the radio lobes by measuring the associated inverse Compton scattering on CMB photon emission.