Broad Absorption Line QSOs
نویسندگان
چکیده
منابع مشابه
Broad Absorption Line Qsos Observed by the Rosat Pspc
Recent results from the ROSAT All-Sky Survey (RASS) have shown that broad absorption line (BAL) QSOs are either highly absorbed or underluminous in the soft X-ray bandpass. Here, we extend this work by analyzing all known bona fide BALQSOs observed within the inner 20 of the ROSAT PSPC. This sample includes both targeted and serendipitous exposures ranging from 8 to 75 ksec. Despite these deep ...
متن کاملTerm Optical Variability in Broad Absorption Line QSOs
We present the first results from a pilot programme to monitor the short term optical variability in Broad Absorption Line system QSOs. Intra-night optical variations of ∼ 5% were detected on time scales of ∼ one hour in QSOs 0846+156 and 0856+172. Further, the mean magnitude level decreased in the two objects by ∼ 0.05 and ∼ 0.15 magnitude respectively during the period of our observations. Th...
متن کاملPolarization properties of broad absorption line QSOs : new statistical clues
We report the results of several statistical tests performed on a large sample of 139 broad absorption line (BAL) QSOs with good quality optical spectra and/or optical polarization data. Correlations between ten optical indices and the polarization degree p0 are systematically searched for. We find six significant non-trivial correlations. In order to identify the most important correlations, w...
متن کاملThe polarization properties of Broad Absorption Line QSOs : observational results
Correlations between BAL QSO intrinsic properties and polarization have been searched for. Some results are summarized here, providing possible constraints on BAL outflow models.
متن کاملAn Exploratory Chandra survey of Large Bright Quasar Survey broad absorption line QSOs
We are in the process of obtaining a complete sample of exploratory X-ray observations of broad absorption line (BAL) QSOs from the Large Bright Quasar Survey (LBQS). This survey is composed of short (5– 7 ks) Chandra ACIS-S3 observations designed to significantly constrain X-ray fluxes and hardness ratios. Our sample avoids the selection biases of some previous surveys while providing X-ray da...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1986
ISSN: 0074-1809
DOI: 10.1017/s007418090015291x