A new catalog of head–tail radio galaxies from LoTSS DR1

Abstract

The unique morphology of head–tail (HT) radio galaxies suggests that radio jets and their intra-cluster medium interact strongly. We conducted a systematic search for HT radio galaxies using the LOFAR two-meter sky survey first data release (LoTSS DR1) at 144 MHz. In this paper, a catalog of 55 new HT radio galaxies is presented, 10 of which are narrow-angle tailed sources (NATs) and 45 are wide-angle-tailed sources (WATs). NATs are characterized by tails that are bent like a narrow ‘V’ shape with a <90\(^{\circ }\) opening angle. The opening angle between jets in WAT radio galaxies is >90\(^{\circ }\), exhibiting wide ‘C’-like morphologies. We found that 30 out of 55 HT radio galaxies reported in this paper are associated with known galaxy clusters. Most of the sources presented in the current paper have redshifts <0.5. Various physical properties and statistical studies of these HT radio galaxies are presented.