VLT Spectropolarimetry of Broad Absorption Line QSOs

Дата и время публикации : 2011-01-25T20:53:25Z

Авторы публикации и институты :
Michael A. DiPompeo
Michael S. Brotherton
Carlos De Breuck

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: Accepted for publication in the Astrophysical Journal Supplement Series
Первичная категория: astro-ph.CO

Все категории : astro-ph.CO

Краткий обзор статьи: We present spectropolarimetry of 19 confirmed and 4 possible bright, southern broad absorption line (BAL) quasars from the European Southern Observatory (ESO) Very Large Telescope (VLT). A wide range of redshifts is covered in the sample (from 0.9 to 3.4), and both low- and hi-ionization quasars are represented, as well as radio-loud and radio-quiet BALQSOs. We continue to confirm previously established spectropolarimetric properties of BALQSOs, including the generally rising continuum polarization with shorter wavelengths and comparatively large fraction with high broad-band polarization (6 of 19 with polarizations >2%). Emission lines are polarized less than or similar to the continuum, except in a few unusual cases, and absorption troughs tend to have higher polarizations. A search for correlations between polarization properties has been done, identifying 2 significant or marginally significant correlations. These are an increase in continuum polarization with decreasing optical luminosity (increasing absolute B magnitude) and decreasing ion{C}{4} emission-line polarization with increased continuum polarization.

Category: Physics