Broad absorption line disappearance and emergence using multiple-epoch spectroscopy from the Sloan Digital Sky Survey [PDF]
, 2017 We investigate broad absorption line (BAL) disappearance and emergence using a 470 BAL-quasar sample over 1x10^-7 pc (0.02 au) using the ionization-change scenario, and constrain a nominal outflow location of < 0.5 pc and a transverse size of ~0.01 pc ...
S. McGraw +10 more
semanticscholar +1 more source
Evidence of First Stars-enriched Gas in High-redshift Absorbers
The Astrophysical Journal, 2023 The first stars were born from chemically pristine gas. They were likely massive, and thus they rapidly exploded as supernovae, enriching the surrounding gas with the first heavy elements.
Andrea Saccardi +8 more
doaj +1 more source
UNSHIFTED METASTABLE He i* MINI-BROAD ABSORPTION LINE SYSTEM IN THE NARROW-LINE TYPE 1 QUASAR SDSS J080248.18+551328.9 [PDF]
, 2014 We report the identification of an unusual absorption-line system in the quasar SDSS J080248.18+551328.9 and present a detailed study of the system, incorporating follow-up optical and near-IR spectroscopy.
T. Ji +13 more
semanticscholar +1 more source
X-ray selected broad absorption line quasars in SDSS-V: BALs and non-BALs span the same range of X-ray properties [PDF]
Broad absorption line (BAL) quasars are often considered X-ray weak relative to their optical/UV luminosity, whether intrinsically (i.e., the coronal emission is fainter) or due to large column densities of absorbing material.
Pranavi Hiremath +12 more
semanticscholar +1 more source
Thomson Thick X-Ray Absorption in a Broad Absorption Line Quasar, PG 0946+301 [PDF]
Astrophysical Journal, 2000 We present a deep ASCA observation of a broad absorption line quasar (BALQSO) PG 0946+301. The source was clearly detected in one of the gas imaging spectrometers, but not in any other detector.
S. Mathur +16 more
semanticscholar +1 more source
MICROLENSING CONSTRAINTS ON BROAD ABSORPTION AND EMISSION LINE FLOWS IN THE QUASAR H1413+117 [PDF]
, 2015 We present new integral field spectroscopy of the gravitationally lensed broad absorption line (BAL) quasar H1413+117, covering the ultraviolet restframe spectral range.
M. O’Dowd +4 more
semanticscholar +1 more source
The Astrophysical Journal Letters, 2023 The launch of JWST opens a new window for studying the connection between metal-line absorbers and galaxies at the end of the Epoch of Reionization.
Yunjing Wu +29 more
doaj +1 more source
Absorption-Line Systems and Galaxies in Front of the Second-brightest Quasar, PHL 1811 [PDF]
, 2003 The extraordinarily bright quasar PHL 1811, at a redshift zem = 0.192, provides an attractive opportunity to use ultraviolet absorption-line spectroscopy to study the properties of gas systems in the local universe.
E. Jenkins +6 more
semanticscholar +1 more source
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
Discovery of Hα Absorption in the Unusual Broad Absorption Line Quasar SDSS J083942.11+380526.3 [PDF]
, 2006 We discovered Hα absorption in the broad Hα emission line of an unusual broad absorption line quasar, SDSS J083942.11+380526.3, at z = 2.318, through near-infrared spectroscopy with the Cooled Infrared Spectrograph and Camera for OHS (CISCO) on the ...
K. Aoki +5 more
semanticscholar +1 more source