Abstract Details
| Name: SAUGATA BARAT Affiliation: Presidency University, Kolkata Conference ID: ASI2019_65 Title : Characterization of X-ray source population in high redshift galaxies Authors and Co-Authors : Saugata Barat PG-1,Presidency University Dr. Suchetana Chatterjee Asst. Proffessor, Presidency University Abstract Type : Poster Abstract Category : Extragalactic Astronomy Abstract : X-ray population studies have been carried out at low redshift (Anderson et. al 2013 ,Grimm et. al 2002) where individual point sources can be resolved, but to carry out such studies at high redshift, is a challenging task. In this work we attempt to characterize the X-ray source population at high redshift (z=0.1-1.4) by studying the hardness ratios (HR) using stacked X-ray maps of galaxies. We have used data from the All Wavelength Extended Groth Strip International Survey (AEGIS) and corresponding redshifts from the Deep Evolutionary Exploratory Probe (DEEP) optical survey. Our full sample consists of 14121 non-AGN galaxies. We have performed a stacking analysis based on stellar mass and star-formation rates cuts to investigate the dependence of HR on redshift. We have observed a peak in the derived HR-z relation obtained from our stacking analysis around z=0.6. To model the observation we have used a linear combination of a hard power law emission with photon index 1.56 which is a typical value for X-Ray binaries and the Astrophysical Plasma Emission Code (APEC) which models the soft x-ray emission from the hot gaseous halo present in the galaxy. Our study provides the first estimate for the redshift evolution of gravitational wave source population statistics using X-ray imaging data. |