Transient C iv broad absorption lines in radio-detected QSOs
نویسندگان
چکیده
منابع مشابه
X-ray Spectroscopy of QSOs with Broad Ultraviolet Absorption Lines
For the population of QSOs with broad ultraviolet absorption lines, we are just beginning to accumulate X-ray observations with enough counts for spectral analysis at CCD resolution. From a sample of eight QSOs [including four Broad Absorption Line (BAL) QSOs and three mini-BAL QSOs] with ASCA or Chandra spectra with more than 200 counts, general patterns are emerging. Their power-law X-ray con...
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Moderate resolution spectra have been recorded for a sample of radio-selected QSOs (z ∼ 2.5) discovered in the “Faint Images of the Radio Sky at Twenty centimeters” (FIRST) VLA survey. This work is motivated by the study of a heterogeneous set of QSO absorption line spectra that showed that as many as 36% of the absorbers normally thought to be intergalactic are correlated with physical propert...
متن کاملX-ray Absorption in Radio-quiet Qsos
Major flows of ionized gas are thought to be present in the nuclei of most luminous QSOs, and absorption by these flows often has a significant effect upon the observed X-ray continuum from the black hole region. We briefly discuss X-ray studies of this gas and attempts to determine its geometry, dynamics, and ionization physics. Our focus is on X-ray warm absorber QSOs, Broad Absorption Line Q...
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 کاملBroad 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 ...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2015
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/stv2240