Results 31 to 40 of about 16,078 (195)
An Unusual Mini-BAL Quasar at z=4.59 [PDF]
, 1999 The z=4.591 quasar PC 1415+3408 exhibits very strong associated metal-line absorption from the N V (1238,1242), Si IV (1393,1402), and C IV (1548,1550) doublets spanning the velocity interval -1700 < v < 0 km/s.
Churchill, Christopher W. +3 more
core +2 more sources
The Nature of LoBAL QSOs. II. HST/WFC3 Observations Reveal Host Galaxies Dominated by Mergers
The Astrophysical Journal, 2023 Low-ionization broad absorption line QSOs (LoBALs) are suspected to be merging systems in which extreme, active galactic nucleus-driven outflows have been triggered.
Mariana S. Lazarova +6 more
doaj +1 more source
The Quasar-frame Velocity Distribution of Narrow CIV Absorbers [PDF]
, 2008 We report on a survey for narrow (FWHM < 600 km/s) CIV absorption lines in a sample of bright quasars at redshifts $1.8 \le z < 2.25$ in the Sloan Digital Sky Survey.
D. Nestor +4 more
core +2 more sources
Do Broad Absorption Line Quasars Live in Different Environments from Ordinary Quasars? [PDF]
The Astrophysical Journal, 2008 accepted for publication in ...
Shen, Yue +5 more
openaire +2 more sources
The Astrophysical Journal, 2023 Narrow-line Seyfert 1 (NLS1) galaxies are an important type of active galactic nucleus (AGN), generally expected to be accreting at a high Eddington rate. The properties of their outflows and importance of AGN feedback remain intriguing. We report on the
Xiao-Dan Fu +3 more
doaj +1 more source
A Variable PV Broad Absorption Line and Quasar Outflow Energetics [PDF]
, 2014 Broad absorption lines (BALs) in quasar spectra identify high velocity outflows that might exist in all quasars and could play a major role in feedback to galaxy evolution.
Barlow, Tom A. +2 more
core +2 more sources
Low-ionization broad absorption lines in quasars
The Astrophysical Journal, 1993 The absorption line properties of six Mg II broad absorption line quasars (BALQs) are examined using a BALQ sample of Weymann et al. (1991). It is found that Al III absorption is always stronger than Al II absorption; C IV absorption tends to be very deep and broad; and low ionization absorption tends to be narrower and lie at the low velocity end of ...
G. M. Voit +2 more
openaire +1 more source
Modeling Line-Driven Disk Wind for Broad Absorption Lines of Quasars [PDF]
Publications of the Astronomical Society of Japan, 2013 Abstract The disk wind, which is powered by the radiation force due to spectral lines (line force), has been studied concerning broad absorption line (BAL) quasars. We investigated the structure of the disk wind based on a non-hydrodynamic method, and compared it with wind properties inferred from X-ray observations of BAL quasars.
Nomura, Mariko +4 more
openaire +2 more sources
SDSS J090152.05+624342.6: A NEW “OVERLAPPING-TROUGH” FeLoBAL QUASAR AT Z ~ 2
Frontiers in Astronomy and Space Sciences, 2017 We here report an identification of SDSS J090152.04+624342.6 as a new “overlapping-trough” iron low-ionization broad absorption line quasar at redshift of z ~ 2.1.
Jing Wang +5 more
doaj +1 more source
The Pan-STARRS1 z > 5.6 Quasar Survey. II. Discovery of 55 Quasars at 5.6 < z < 6.5
The Astrophysical Journal Supplement Series, 2023 The identification of bright quasars at z ≳ 6 enables detailed studies of supermassive black holes, massive galaxies, structure formation, and the state of the intergalactic medium within the first billion years after the Big Bang.
Eduardo Bañados +22 more
doaj +1 more source