Results 1 to 10 of about 336 (152)
Spectroscopy of Broad Absorption Line Quasars at 3 ≲ Z ≲ 5. I. Evidence for Quasar Winds Shaping Broad/Narrow Emission Line Regions [PDF]
Astrophysical Journal, 2020 Abstract We present an observational study of 22 broad absorption line quasars (BAL QSOs) at based on optical/near-IR spectroscopy, aiming to investigate quasar winds and their effects.
Weimin Yi, Wenwen Zuo, Jinyi Yang
exaly +4 more sources
High-Resolution Spectroscopy of Quasars and Quasar Absorption-Line Systems [PDF]
Publications of the Astronomical Society of the Pacific, 1995 Topic cover in this paper included new observations of QSO absorption lines by the Keck Telescope HIRES spectrometer and the Hubble Space Telescope. An overview of the major scientific issues in this field is followed by a brief summary of a panel discussion that addressed future instrumental possibilities that could answer some of these questions.
exaly +2 more sources
Astrophysical Journal, Supplement Series, 1997 We have obtained a high signal-to-noise (30 ? S/N ? 70), high-resolution (FWHM = 20 km s-1) spectrum of the radio-quiet QSO HS 1700+6416 (zem = 2.72) with the echelle spectrograph on the Kitt Peak National Observatory 4 m telescope. We detect 13 metal systems in the optical spectrum of this QSO, including six systems with associated optically thin ...
Todd M Tripp, Blair D Savage
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Astrophysical Journal, 2005 A new generation of sensitive X-ray measurements are indicating that the existence of X-ray attenuation column densities, NH > 1024 cm-2, is quite common among broad absorption line quasars (BALQSOs). This is significant to the geometry of the broad absorption line (BAL) outflow.
Brian Punsly, Sebastian Lipari
exaly +3 more sources
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
XMM-NewtonSpectroscopy of the Highly Polarized and Luminous Broad Absorption Line Quasar CSO 755 [PDF]
The Astronomical Journal, 2005 7 pages (emulateapj), 3 figures.
Shemmer O. +6 more
openaire +4 more sources
Upper limits on the 21 cm power spectrum at z = 5.9 from quasar absorption line spectroscopy [PDF]
Monthly Notices of the Royal Astronomical Society: Letters, 2016 Abstract We present upper limits on the 21 cm power spectrum at z = 5.9 calculated from the model-independent limit on the neutral fraction of the intergalactic medium of $x_{{\rm H\,\small {I}}} < 0.06 + 0.05\ (1\sigma )$ derived from dark pixel statistics of quasar absorption spectra.
Pober, Jonathan C. +2 more
openaire +3 more sources
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
Subaru High-Resolution Spectroscopy of Complex Metal Absorption Lines of the Quasar HS 1603+3820 [PDF]
The Astronomical Journal, 2003 35 pages, 11 figures, accepted for publication in the Astronomical ...
Misawa, Toru +6 more
openaire +2 more sources
VLT+UVES Spectroscopy of the Ca
The Astrophysical Journal, 2003 We study high-resolution spectra of the "overlapping-trough" low-ionization broad absorption line (LoBAL) quasar SDSS J030000.56+004828.0. The Ca II, Mg II, and Mg I column densities in this object are the largest reported to date for any BAL outflow. The broad Ca II absorption is mildly blended, but the blending can be disentangled to measure the Ca ...
Hall, PB +6 more
openaire +1 more source