THE INTRINSIC FRACTIONS AND RADIO PROPERTIES OF LOW-IONIZATION BROAD ABSORPTION LINE QUASARS
نویسندگان
چکیده
منابع مشابه
The Frequency and Radio Properties of Broad Absorption Line Quasars
A sample of 67 Broad Absorption Line quasars (BALQSOs) from the Large Bright Quasar Survey (LBQS) is used to estimate the observed and intrinsic fraction of BAL quasars in optically– selected samples at intermediate (BJ ≃ 18.5) magnitudes. The observed BALQSO fraction in the redshift range 1.5 ≤ z ≤ 3.0 is 15± 3%. A well–determined, empirical, k–correction, to allow for the differences in the s...
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We present the results of EVN+MERLIN VLBI polarization observations of 8 Broad Absorption Line (BAL) quasars at 1.6 GHz, including 4 LoBALs and 4 HiBALs with either steep or flat spectra on VLA scales. Only one steep-spectrum source, J1122+3124, shows two-sided structure on the scale of 2 kpc. The other four steep-spectrum sources and three flat-spectrum sources display either an unresolved ima...
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متن کاملBroad Absorption Line Quasars and the Radio–Loud/Radio–Quiet Dichotomy
The observation that the extremely broad, blueshifted absorption troughs which characterize broad absorption line quasars (BALQs) occur exclusively in radio–quiet quasars (RQQs) suggests that this class of active galactic nuclei (AGN) may offer important clues to the radio–loud/radio–quiet (RL/RQ) dichotomy in quasars. Interestingly, there is also substantial observational evidence for similar,...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2012
ISSN: 0004-637X,1538-4357
DOI: 10.1088/0004-637x/757/2/180