| Name: | Sameer Salunkhe |
| Affiliation: | National Centre for Radio Astrophysics |
| Conference ID : | ASI2024_605 |
| Title : | Exploring the intriguing radio phenomena in the galaxy cluster Abell 104 using uGMRT |
| Authors : | Sameer Salunkhe 1, Surajit Paul 2, Ruta Kale 1, Abhirup Datta 3 |
| Authors Affiliation: | 1 National Centre for Radio Astrophysics, Pune-411007, India.
2 Associate Professor, Manipal Centre for Natural Sciences (MCNS), MAHE, Manipal 576104, India.
3 Indian Institute of Technology Indore, Simrol 453552, India. |
| Mode of Presentation: | Poster |
| Abstract Category : | Galaxies and Cosmology |
| Abstract : | Diffuse radio sources within clusters indicate synchrotron-emitting particles experiencing (re-)acceleration due to merger-related shocks and turbulence. These accelerated particles likely have higher initial energies than the thermal pool, though their precise source remains uncertain. Research suggests that low Mach number cluster shocks may re-accelerate relic relativistic electrons from active galactic nuclei. AGN activity significantly affects non-thermal energy content, especially in more active low-mass clusters. The cluster Abell 104, located nearby at a redshift of z=0.0822, is a relatively low-mass galaxy cluster (with a mass of ~2.52* 10^14 Solar mass). The cluster has been observed using the uGMRT Band 3 and band 4 and used the sensitive LOFAR survey image at 144 MHz for further analysis. This cluster is characterized by the presence of a giant head-tail radio galaxy (∼700 kpc) displaying a convex geometry. Notably, the structure of heat-tail radio galaxy exhibits an abrupt disruption in its tail, and the tail’s tip displays an ultra-steep spectrum (spectral index <–1.5). At the very end of tail of the heat-tail radio galaxy, bar is observed almost perpendicular to the radio emission in the tail. Head-tail radio galaxies distinct appearance results from intense interactions between their radio jets and the intra-cluster medium (ICM). These interactions, often attributed to turbulent conditions in galaxy clusters, provide insights into both radio jet properties and ICM dynamics. The cluster also hosts low surface brightness diffuse structures in the north-east region, which are potentially remnants of previous episodes of active cluster galaxies. Additionally, a diffuse radio source is observed around the central BCG (Brightest Cluster Galaxy), along with a nearby elongated structure that we hypothesize may be a halo-relic system. In summary, Abell 104 is a complex cluster, hosting diverse radio sources that demonstrate interactions between the advancing radio jets and the perturbed ICM due to the internal dynamics of the cluster medium. |
