Abstract Details

Name: GOPIKA K
Affiliation: INDIAN INSTITUTE OF TECHNOLOGY, HYDERABAD
Conference ID: ASI2021_119
Title : Scaling relations for dark matter core density and radius from Chandra X-ray cluster sample
Authors and Co-Authors : Gopika K.(Indian Institute of Technology, Hyderabad) Shantanu Desai (Indian Institute of Technology, Hyderabad)
Abstract Type : Poster
Abstract Category : Extragalactic Astronomy
Abstract : A large number of studies have found that the dark matter surface density, given by the product of the dark matter core radius (rc) and core density (ρc) is approximately constant for a wide range of galaxy systems. However, there has been only one systematic study of this ansatz for galaxy clusters by Chan (arXiv:1403.4352), who found that the surface density for clusters is not constant and ρc∼rc^(−1.46). We carry out this test for an X-ray sample of 12 relaxed clusters from Chandra observations, implementing the same procedure as Chan, but also accounting for the gas and star mass. We find that ρc∝rc^(−1.08±0.055), with an intrinsic scatter of about 18%. Therefore, the dark matter surface density for our cluster data shows deviations from a constant value at only about 1.4σ