Results 11 to 20 of about 335 (139)
Spectroscopy of Broad Absorption Line Quasars at 3 ≲ Z ≲ 5. I. Evidence for Quasar Winds Shaping Broad/Narrow Emission Line Regions [PDF]
The 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 +8 more
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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
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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
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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
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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
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Associated Absorption Lines in the Radio‐loud Quasar 3C 351: Far‐Ultraviolet Echelle Spectroscopy from theHubble Space Telescope [PDF]
The Astrophysical Journal, 2002 As one of the most luminous radio-loud quasars showing intrinsic ultraviolet (UV) and X-ray absorption, 3C 351 provides a laboratory for studying the kinematics and physical conditions of such ionized absorbers. We present an analysis of the intrinsic absorption lines in the high-resolution ($\sim$ 7 km/s) far-UV spectrum which was obtained from ...
Yuan, Q. +5 more
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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.
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The 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.
Sebastian Lipari, B. Punsly
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The 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, Limin Lu, Blair D. Savage
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, 2012 2 pages, 2 figures, Conference proceedings for "AGN Winds in Charleston," Charleston, SC, Oct 15-18, 2011.
Haggard, Daryl +4 more
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