Discovery of 100 kpc narrow curved twin jet in S-shaped giant radio galaxy: J0644+1043

TL;DR

This paper reports the discovery of an S-shaped giant radio galaxy with twin jets extending over 100 kpc, revealing a complex morphology likely caused by jet precession, and provides detailed measurements of its structure, age, and black hole properties.

Contribution

The study presents the first detailed imaging and analysis of a 100 kpc twin jet in an S-shaped giant radio galaxy, highlighting its unique morphology and physical characteristics.

Findings

Giant radio galaxy with over 0.7 Mpc size and 100 kpc long jets

Estimated age of less than 50 million years for the radio structure

Black hole mass of approximately 4.1 x 10^8 solar masses

Abstract

We report the discovery of an S-shaped morphology of the radio galaxy J0644$+$1043 imaged with a 30 $\mu$Jy sensitive 525 MHz broadband (band 3 $+$ 4) uGMRT map. Dedicated spectroscopic observations of the host galaxy carried out with the 2-meter Rozhen telescope yielded a redshift of 0.0488, giving a projected linear size of the peculiar radio structure of over 0.7 Mpc. This giant radio galaxy is powered by a black hole of mass 4.1$^{+9.39}_{-2.87}\times 10^8$ \msun, from which vicinity emanate well-collimated and knotty jets, each $\sim$100 kpc long. The entire radio structure, presumably due to the effective jet precession, is less than 50 Myr old, has a power of $\sim$6 $\times 10^{24}$ W Hz$^{-1}$ at 1.4 GHz and the observed morphological characteristics do not strictly conform to the traditional FR I or FR II categories.