Results 11 to 20 of about 16,078 (195)
DESI z ≳ 5 Quasar Survey. I. A First Sample of 400 New Quasars at z ∼ 4.7–6.6
The Astrophysical Journal Supplement Series, 2023 We report the first results of a high-redshift ( z ≳ 5) quasar survey using the Dark Energy Spectroscopic Instrument (DESI). As a DESI secondary target program, this survey is designed to carry out a systematic search and investigation of quasars at 4.8 <
Jinyi Yang +41 more
doaj +1 more source
Variability in Quasar Broad Absorption Line Outflows [PDF]
Proceedings of the International Astronomical Union, 2009 Broad absorption lines (BALs) in quasar spectra identify high-velocity outflows that likely exist in all quasars and could play a major role in feedback to galaxy evolution (e.g., Di Matteo et al. 2005). Studying the variability in these BALs can help us understand the structure, evolution, and basic physical properties of these outflows.
Daniel M. Capellupo +4 more
openaire +1 more source
The Astrophysical Journal Letters, 2023 We report on the discovery of a rare case of spatially and kinematically resolved galactic-scale outflow at intermediate redshift based on VLT/MUSE optical integral field spectroscopic observation of the quasar HE 0238–1904.
Qinyuan Zhao, Junfeng Wang
doaj +1 more source
Discovery of Newly Formed Broad Absorption Lines in a Radio-Loud Quasar [PDF]
, 2002 We report a serendipitous discovery of broad absorption lines that were newly formed in the spectrum of the high-redshift, luminous radio-loud quasar TEX 1726 + 344, in a time interval of only 12 years.
F. Ma, Ma
core +3 more sources
Spectropolarimetry of FIRST Broad Absorption Line Quasars [PDF]
The Astrophysical Journal, 1997 We present Keck spectropolarimetry of two rare low-ionization broad absorption line (BAL) quasars (QSOs), FIRST J084044.5+363328 and FIRST J155633.8+351758, that also exhibit narrow absorption lines from metastable excited levels of Fe II (iron Lo-BALs).
M. S. Brotherton +4 more
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The Astrophysical Journal, 2023 Broad absorption line quasars are actively accreting supermassive black holes that have strong outflows characterized by broad absorption lines in their rest-UV spectra.
Kaylie S. Green +7 more
doaj +1 more source
The orientation and polarization of broad absorption line quasars★ [PDF]
Monthly Notices of the Royal Astronomical Society, 2012 We present new spectropolarimetric observations of 8 radio-loud broad absorption line (BAL) quasars, and combine these new data with our previous spectropolarimetric atlases (of both radio-loud and radio-quiet objects) in order to investigate the polarization properties of BAL quasars as a group.
DiPompeo, M. A. +2 more
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The Astrophysical Journal Supplement Series, 2023 We report the fourth installment in the series of the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) quasar survey, which includes quasars observed between 2017 September and 2021 June.
Jun-Jie Jin +12 more
doaj +1 more source
AChandraSurvey of Broad Absorption Line Quasars [PDF]
The Astrophysical Journal, 2001 12 pages, Latex, emulateapj style, including 3 tables and 3 figures. Accepted May 15, 2001 for publication in ApJ Main Journal. See also http://hea-www.harvard.edu/~pgreen/Papers.html Replaced May 21 since 2 lines were missing from Table ...
Green, Paul J. +4 more
openaire +3 more sources
Broad Absorption Line Quasar catalogues with Supervised Neural Networks [PDF]
, 2008 We have applied a Learning Vector Quantization (LVQ) algorithm to SDSS DR5 quasar spectra in order to create a large catalogue of broad absorption line quasars (BALQSOs).
Christian Knigge +4 more
core +1 more source