Reference wavelengths of Si ii, C ii, Fe i, and Ni ii for quasar absorption spectroscopy. [PDF]
Monthly notices of the Royal Astronomical Society, 2020 Wavelengths of absorption lines in the spectra of galaxies along the line of sight to distant quasars can be used to probe the variablility of the fine structure constant, α, at high redshifts, provided that the laboratory wavelengths are known to better
G. Nave, C. Clear
semanticscholar +1 more source
The Study of the Circumgalactic Medium with Quasar Pairs
The Astrophysical Journal Supplement Series, 2023 We have collected 10,025 foreground–background quasar pairs with projected distances d _p < 500 kpc from the large quasar catalog of the Sloan Digital Sky Survey DR16Q. We investigate the properties of the Mg ii absorption lines with W _r > 0.15 Å around
Zhi-Fu Chen +7 more
doaj +1 more source
Neutral-gas-phase metal abundances in Zn ii-selected quasar absorption line systems near redshift z = 1.2★ [PDF]
Monthly notices of the Royal Astronomical Society, 2018 We present ten metallicity measurements for quasar absorbers near $z=1.2$ that were selected for having unusually significant ZnII absorption in their SDSS spectra.
E. Monier +4 more
semanticscholar +1 more source
Near-infrared spectroscopy of extreme BAL QSOs from the QUBRICS bright quasar survey [PDF]
, 2021 We report on the spectral confirmation of 18 QSO candidates from the"QUasars as BRIght beacons for Cosmology in the Southern hemisphere'' survey (QUBRICS), previously observed in the optical band, for which we acquired new spectroscopic data in the near ...
G. Cupani +10 more
semanticscholar +1 more source
Polypept(o)ide-Based Core-Shell Bottlebrush Polymers: A Versatile Platform for Drug Encapsulation. [PDF]
Macromol BiosciThis study developed polypept(o)ide‐based core–shell brushes (CSBs) with tunable sizes (Rh: 17–70 nm) for hydrophobic drug delivery. CSBs achieved 10% dasatinib loading through π–π interactions, enabling sustained release over 72 h. Notably, CSB‐dasatinib complexes showed comparable cell viability reduction to the free drug in U‐87 MG cells ...
Zhao B +6 more
europepmc +2 more sources
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
Laboratory atomic transition data for precise optical quasar absorption spectroscopy [PDF]
, 2013 Quasar spectra reveal a rich array of important astrophysical information about galaxies which intersect the quasar line of sight. They also enable tests of the variability of fundamental constants over cosmological time and distance-scales. Key to these
M. Murphy +2 more
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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
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