The Study of Circumgalactic Medium with Quasar Pairs

Abstract

We have collected 10025 foreground-background quasar pairs with projected distances $d_p<500$ kpc from the large quasar catalog of the SDSS DR16Q. We investigate the properties of the Mg II absorption lines with $W_r>0.15$ Å around foreground quasars, including both the LOS (line-of-sights of foreground quasars) and transverse (TRA, perpendicular to the LOS) absorptions. Both the equivalent width (the correlation coefficient $\rho =-0.915$ and the probability $P<10^{-4}$ of no correlation) and incident rate ($\rho =-0.964$ and $P<10^{-6}$) of TRA \Mgii\ absorption lines are obviously anti-correlated with projected distance. The incident rate of TRA \Mgii\ absorption lines is obviously ($>4\sigma$) greater than that of LOS \Mgii\ absorption lines at projected distances $d_p<200$ kpc, while the TRA and LOS \Mgii\ both have similar ($<3\sigma$) incident rates at scales $d_p>200$ kpc. The anisotropic radiation from quasars would be the most possible interpretation for the anisotropic absorption around quasars. This could also indicate that the quasar radiation is not obviously impacting the gas halos of quasars at scales $d_p>200$ kpc.

15 pages, Accepted in ApJS

References in corpus (35)

• Cosmic Star Formation History
• The 2.5 m Telescope of the Sloan Digital Sky Survey
• A Catalog of Quasar Properties from SDSS DR7
• The Circumgalactic Medium
• The Sloan Digital Sky Survey Quasar Catalog: Sixteenth Data Release
• Quasar Quartet Embedded in Giant Nebula Reveals Rare Massive Structure in Distant Universe
• Quasars Probing Quasars II: The Anisotropic Clustering of Optically Thick Absorbers around Quasars
• Quasars Probing Quasars VII. The Pinnacle of the Cool Circumgalactic Medium Surrounds Massive z~2 Galaxies
• The large and small scale properties of the intergalactic gas in the Slug Ly-alpha nebula revealed by MUSE HeII emission observations
• Evolution of the Cool Gas in the Circumgalactic Medium (CGM) of Massive Halos -- A Keck Cosmic Web Imager (KCWI) Survey of Ly$\alpha$ Emission around QSOs at $z\approx 2$
• Inspiraling Halo Accretion Mapped in Lyman-$\alpha$ Emission around a $z\sim 3$ Quasar
• The REQUIEM Survey I: A Search for Extended Ly-Alpha Nebular Emission Around 31 z>5.7 Quasars
• Narrow associated QSO absorbers: clustering, outflows and the line-of-sight proximity effect
• The Baryon Content of Dark Matter Halos: Empirical Constraints from MgII Absorbers
• MUSE Analysis of Gas around Galaxies (MAGG) -- III: The gas and galaxy environment of z = 3-4.5 quasars
• Kinematic alignment of non-interacting CALIFA galaxies: Quantifying the impact of bars on stellar and ionised gas velocity field orientations
• On the Halo Occupation of Dark Baryons
• Mapping the Lyman-Alpha Emission Around a z~6.6 QSO with MUSE: Extended Emission and a Companion at Close Separation
• Variation of ionizing continuum: the main driver of Broad Absorption Line Variability
• Characterizing the abundance, properties, and kinematics of the cool circumgalactic medium of galaxies in absorption with SDSS DR16
• MUSE Analysis of Gas around Galaxies (MAGG) -- IV: The gaseous environment of $z\sim$ 3-4 Lyman-alpha emitting galaxies
• The extent of the MgII absorbing circum-galactic medium of quasars
• Evidence for quasar fast outflows being accelerated at the scale of tens of parsecs
• Lyman Alpha and MgII as Probes of Galaxies and their Environments
• Modeling the Infrared Reverberation Response of the Circumnuclear Dusty Torus in AGN: The Effects of Cloud Orientation and Anisotropic Illumination
• SDSS-IV MaNGA: Global Properties of Kinematically Misaligned Galaxies
• A Complex Multiphase DLA Associated with a Compact Group at z=2.431 Traces Accretion, Outflows, and Tidal Streams
• Average [O II] nebular emission associated with Mg II absorbers: Dependence on Fe II absorption
• Collective properties of quasar narrow associated absorption lines
• Searching for MgII absorbers in and around galaxy clusters
• The environment of low redshift quasar pairs
• Narrow C IV absorption doublets on quasar spectra of the Baryon Oscillation Spectroscopic Survey
• Large-scale Dynamics of Winds Driven by Line Force from a Thin Accretion Disk
• Probing the circumgalactic medium of active galactic nuclei with background quasars
• The detections of inflowing gas from narrow absorption lines at the parsec scale