Poster Presentation

Statistical analysis of BAL quasars using SED fitting

Author(s): Yuri Yanagiya, Akatoki Noboriguchi, Toru Misawa

Presenter: Yuri Yanagiya (Shinshu university)

Broad absorption lines (BALs) with a line width of > 2000 km/s are often detected in spectra of quasars with a fraction of those quasars (BAL quasars) is in the range of about 10 – 40%. There are two possible scenarios of BAL quasars; i) they are viewed at large inclination angle (but not so large as Type 2 quasars) and ii) they are at the early stage of quasar evolution. If the former is the case, a detection rate of BAL quasars depends on an inclination angle and an opening angle of dust torus. However, these parameters have not been evaluated in detail using large samples.
In this study, we exploit photometric archive data in multi-bands from UV (SDSS), NIR (2MASS), to MIR (WISE) to estimate three key parameters (an inclination angle, an opening angle of dust torus, and dust extinction) by SED fitting with CIGALE. We perform the analysis for both BAL and non-BAL quasars to see if the result is consistent to the inclination scenario (or the evolution scenario is more promising).