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Exploratory Study of Transverse Proximity Effect around BAL Quasars by Misawa, Toru; Ishimoto, Rikako; Kobu, Satoshi; Kashikawa, Nobunari; Okoshi, Katsuya; Noboriguchi, Akatoki; Schramm, Malte; Liu, Qiang is a scholarly article available to read on EtoBox.

What is Exploratory Study of Transverse Proximity Effect around BAL Quasars about?

We aim to find out the reason why there exists an anisotropic HI absorption around quasars; i.e., the environments around quasars are highly biased toward producing strong HI absorption in transverse direction while there exists a significant deficit of HI absorption within a few Mpc of quasars along line-of-sight. The most plausible explanation for this opposite trend is that the transverse direction is shadowed from the quasar UV radiation due to dust torus. However, a critical weakness of this idea is that we have no information on inclination angle of our sightline relative to the torus. In this study, we examine environments of quasars with broad absorption troughs in their spectra (i.e., BAL quasars) because it is widely believed that BAL troughs are observed if the central continuum is viewed from the side through their powerful outflows near the dust torus. With closely separated 12 projected quasar pairs at different redshift with separation angle of $\theta$$<$120$^{\prime\prime}$, we examine HI absorption at foreground BAL quasars in spectra of background quasars. We confirm there exist optically thick gas around two of 12 BAL quasars, and that the mean HI absorption str

Author

Misawa, Toru; Ishimoto, Rikako; Kobu, Satoshi; Kashikawa, Nobunari; Okoshi, Katsuya; Noboriguchi, Akatoki; Schramm, Malte; Liu, Qiang

Published

2022

Language

EN