Seminar
Quasars as a tracer of large-scale structure at z~0.5

Resumen

We present correlation between quasar properties and large-scale density with the largest spectroscopic dataset of quasars and galaxies to date. We construct a galaxy (number) density field on large-scale (~15Mpc) using the Sloan Digital Sky Survey (SDSS) Data Release 12 (DR12) Constant MASS (CMASS) galaxies following the 20 nearest-neighbors approach over the redshift range 0.46<z<0.59. Quasar sample is prepared from the DR7 of SDSS I/II. We examine a correlation of incidence of quasars with large-scale density and dependences of quasar properties such as bolometric luminosity, black hole mass, and Eddington ratio on large-scale density. We find a monotonic correlation between the quasar density and large-scale density, which is fitted well with a linear function in log-log space and doesn't change much with redshift. The dependences of quasar properties on the large-scale density are detected, but these are very weak. Based on the results, we discuss the possibility of using quasars as a tracer of Large-Scale Structure (LSS), which will be crucial in the near future to go more deeply in the universe.