Abstract Details
| Name: PRATEEK GUPTA Affiliation: S. P . PUNE UNIVERSITY, PUNE, MAHARASHTRA Conference ID: ASI2016_768 Title : Revealing radio structures from filamentary inroads and cluster outskirts by numerical modelling of radio emissions Authors and Co-Authors : Reju Sam John, PhD Student, PEC Pondhicherry University. Surajit Paul, Dept of Physics, S.P. Pune University. Abstract Type : Poster Abstract Category : General Relativity and Cosmology Abstract : The structures at Large-scale ( greater than few tens of Mpc ) in the Universe comprises of complex filamentary network of matter surrounding the large voids and connect the massive Galaxy clusters. Filaments are the main channels through which dark matter and baryons drains from voids and reach the nodes where the clusters are formed. Magnetic field in Galaxy clusters are presumably amplified by shock waves in Inter-Cluster Medium ( ICM ) which are generated during the formation of these structures. These shock compression also accelerate significant population of charge particles. Due to baroclinic instability at the junction of filaments and Galaxy clusters, a significant turbulence is generated which further amplify the magnetic field by dynamo action and also re-accelerate the charge particles which, in turn, produce synchrotron emission which could help in tracing back the dynamical history of these structures. In this work, we have developed models for computing radio emission from Large Scale Structures using Adaptive Mesh Refinement (AMR) based cosmological simulations. Computation is done on grid parameters and a proper weight has been used to nullify the effect of complicated resolution pattern of an AMR simulation. We have implemented both turbulent re-acceleration and Diffusive shock acceleration models to compute the radio emission. Finally, we have created synthetic radio maps and clearly predicted the possible detectability with the new generation Radio telescopes. This work of ours has resolved many issues with unexplained observed radio structures like radio relics found at few Mega parsec away from the Galaxy clusters as well as it has predicted some very interesting radio structure that will possibly be revealed by the new generation telescopes in near future. |