Circum-Galactic Medium in the Halo of Quasars [PDF]
Frontiers in Astronomy and Space Sciences, 2017 The properties of circum-galactic gas in the halo of quasar host galaxies are investigated analyzing Mg II 2800 and C IV 1540 absorption-line systems along the line of sight close to quasars.
Riccardo Ottolina +6 more
doaj +5 more sources
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
openaire +3 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
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
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
Associated Absorption Lines in the Radio‐loud Quasar 3C 351: Far‐Ultraviolet Echelle Spectroscopy from theHubble Space Telescope [PDF]
The Astrophysical Journal, 2002 27 pages with 5 figures, accepted by ...
Yuan, Q. +5 more
openaire +2 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.
openaire +1 more source
Spectroscopy along Multiple, Lensed Sightlines through Outflowing Winds in the Quasar SDSS J1029+2623 [PDF]
, 2012 We study the origin of absorption features on the blue side of the C IV broad emission line of the large-separation lensed quasar SDSS J1029+2623 at z_em ~ 2.197.
Gandhi, Poshak +5 more
core +3 more sources