Abstract Details
| Name: Atul Mohan Affiliation: NCRA-TIFR Conference ID: ASI2016_450 Title : Radio properties of optically selected quasars Authors and Co-Authors : Yogesh Wadadekar, NCRA-TIFR Abstract Type : Poster Abstract Category : Extragalactic astronomy Abstract : Radio properties of quasars and the physical mechanism responsible for the radio emission are not fully understood even after 50 years of their discovery. Only ~10% of optically selected quasars have fluxes high enough to be detectable in large area radio surveys. However, by stacking radio images at the positions of optically selected quasars, we can study the average radio properties of these objects at flux levels well below the flux limit of the radio survey. We use optical quasar catalogs from the Sloan Digital Sky Survey (SDSS-DR7) and radio images from the VLA FIRST survey to study the radio and optical properties of a sample of > 10^5 quasars. We investigate the interdependence of quasar properties such as radio luminosity, radio loudness and optical color and their evolution with redshift. This is done by stacking various carefully selected sub-samples from our large optically selected quasar catalog. |