Faint Quasars Live in the Same Number Density Environments as Lyman Break Galaxies at z ˜ 4

摘要: Characterizing high-z quasar environments is key to understanding the co-evolution of quasars and surrounding galaxies. To restrict their global picture, we statistically examine g-dropout galaxy overdensity distribution around 570 faint candidates at z ~ 4, based on Hyper Suprime-Cam Subaru Strategic Program survey. We compare significances galaxies with those galaxies, find no significant difference between distributions. A total 4 (22) out quasars, 0.7_{-0.4}^{+0.4} (3.9_{-0.8}^{+0.8}) %, are found be associated > sigma overdense regions within an angular separation 1.8 (3.0) arcmin, which typical size protoclusters this epoch. This similar fraction regions. result consistent our previous work that 1.3_{-0.9}^{+0.9} % 2.0_{-1.1}^{+1.1} luminous detected in Sloan Digital Sky Survey exist 3.0 arcmin separations, respectively. Therefore, suggest number densities independent luminosity, most do not preferentially appear richest protocluster 4. The lack apparent positive correlation implies that: i) gas-rich major merger rate relatively low regions, ii) may through secular processes, or iii) some dust-obscured