Abstract Details
| Name: Krishna Shende Affiliation: NCRA-TIFR, Pune Conference ID: ASI2019_414 Title : A Mini-Halo in a Massive Galaxy Cluster in the Southern Sky Authors and Co-Authors : Krishna Moreshwar Shende (NCRA-TIFR, Pune), Dr. Ruta Kale (NCRA-TIFR, Pune), Dr. Viral Parekh (Physics and Electronics Department, Rhodes University, Grahamstown and Square Kilometer Array Office, Observatory, Cape Town.) Abstract Type : Poster Abstract Category : Extragalactic Astronomy Abstract : Mini-halos are faint, diffuse radio emission that surrounds the central brightest galaxies in about half of the cool-core galaxy clusters. They are about 500kpc in size, having low surface brightness and steep spectra, making them a challenge for detection. So far, about 20 mini-halos have been discovered and have been proposed to be a result of hadronic collisions and turbulent re-acceleration. However, the physical mechanism behind the origin of minihalos is not understood well due to the small number of such sources known. SPT-CLJ0232-4421 is a galaxy cluster at a spectroscopic redshift of 0.284, with a mass of 8.9*10**14 solar masses and X-ray Luminosity of 6.4*10**44 erg/sec. We have observed this cluster with the Giant Metrewave Radio Telescope at 610MHz with 33MHz bandwidth. We detect diffuse emission around the central bright galaxy which we classify as a candidate mini-halo. We will present the radio properties of the candidate mini-halo and discuss its origin in the light of the multi-wavelength properties of the galaxy cluster itself. |