English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

We investigate the continuum and emission-line properties of 224 broadabsorption line quasars (BALQSOs) with 0.9<z<4.4 drawn from the Sloan DigitalSky Survey (SDSS) Early Data Release (EDR), which contains 3814 bona fidequasars. We find that low-ionization BALQSOs (LoBALs) are significantlyreddened as compared to normal quasars, in agreement with previous work.High-ionization BALQSOs (HiBALs) are also more reddened than the averagenonBALQSO. Assuming SMC-like dust reddening at the quasar redshift, the amountof reddening needed to explain HiBALs is E(B-V)~0.023 and LoBALs isE(B-V)~0.077 (compared to the ensemble average of the entire quasar sample). Wefind that there are differences in the emission-line properties between theaverage HiBAL, LoBAL, and nonBAL quasar. These differences, along withdifferences in the absorption line troughs, may be related to intrinsic quasarproperties such as the slope of the intrinsic (unreddened) continuum; moreextreme absorption properties are correlated with bluer intrinsic continua.Despite the differences among BALQSO sub-types and nonBALQSOs, BALQSOs appearto be drawn from the same parent population as nonBALQSOs when both areselected by their UV/optical properties. We find that the overall fraction oftraditionally defined BALQSOs, after correcting for color-dependent selectioneffects due to different SEDs of BALQSO and nonBALQSOs, is 13.4+/-1.2% andshows no significant redshift dependence for 1.7<z<3.45. After a roughcompleteness correction for the effects of dust extinction, we find thatapproximately one in every six quasars is a BALQSO.Comment: 35 pages, 11 figures (1 color), 1 table; accepted by A

Address

About

Learn

Download the Zendy App

Discover

Explore