| Name: Shobha Kumari |
| Affiliation: Midnapore City College, Vidyasagar University |
| Conference ID: ASI2026_201 |
| Title: The Influence of Cluster Environment on Jet Morphology in Megaparsec-scale Radio Galaxies |
| Abstract Type: Poster |
| Abstract Category: Galaxies and Cosmology |
| Author(s) and Co-Author(s) with Affiliation: Shobha Kumari(Midnapore City College, Midnapore - 721129, India), Sabyasachi Pal(Midnapore City College, Midnapore - 721129, India), Martin J. Hardcastle(University of Hertfordshire, Hatfield, United Kingdom), Marek Jamrozy(Astronomical Observatory, Jagiellonian University ul. Orla 171, 30-244 Krakow, Poland), Surajit Paul(Manipal Academy of Higher Education: Manipal, Karnataka - 576104, India), Maya A. Horton(University of Cambridge, England, United Kingdom) |
| Abstract: Giant radio galaxies (GRGs), extending over megaparsec scales, offer unique opportunities for studying the interaction between active galactic nucleus (AGN) jets and their surrounding intracluster medium (ICM) environment. Using 144 MHz data from the LOFAR Two-metre Sky Survey Data Release 2 (LoTSS DR2), followed up by GMRT, we presented a multi-wavelength study of two peculiar GRGs, J0011+3217 and J1007+3540, highlighting the role of cluster environments and galaxy dynamics in shaping radio morphology and jet evolution.
J0011+3217 exhibits a misaligned primary lobe and an unusually large, one-sided diffuse secondary wing extending up to 0.85 Mpc, nearly 85% of its 0.99 Mpc primary lobe. Located in the Abell 7 cluster environment, the source hosts an AGN at its geometrical centre, with a nearby optical galaxy at a projected separation of 16 kpc, suggesting the possibility of a dual AGN system. XMM-Newton data reveal extended X-ray emission associated with the cluster, while galaxy velocity and spatial distribution suggest that the GRG resides in an offset galaxy group moving relative to the Abell 7 cluster. The pronounced off-axis distortion of the primary lobe is consistent with ram-pressure effects arising from motion through ICM.
To further explore environmental influences on GRG evolution, we studied J1007+3540, a 1.45 Mpc GRG hosted by a massive elliptical galaxy associated with the WHL 100706.4+354041 cluster. Radio imaging reveals clear evidence of recurrent AGN activity, including aged outer lobes (radiative age ≈240 Myr), younger inner jets (≈140 Myr), and a one-sided extended diffuse tail exhibiting a distinct morphological break. These features suggest episodic jet activity coupled with environmental interactions.
Together, these studies demonstrate that cluster environments, relative galaxy motions, and ICM interactions play a crucial role in governing the morphology, spectral ageing, and AGN duty cycles in GRGs on megaparsec scales. |
