Results 91 to 100 of about 10,836 (194)
One H2 molecule per ten million H atoms reveals sub-parsec-scale cold overdensities at z ∼ 4★
Astronomy & AstrophysicsWe present the detection and analysis of H2 absorption at z = 4.24 towards the bright quasar J 0007−5705, which was observed with the Very Large Telescope as part of the ESPRESSO QUasar Absorption Line Survey (EQUALS). The high resolving power of R ≈ 120
Noterdaeme P. +13 more
doaj +1 more source
SDSS J115517.35+634622.0: A Newly Discovered Gravitationally Lensed Quasar
, 2003 We report the discovery of SDSSJ115517.35+634622.0, a previously unknown gravitationally lensed quasar. The lens system exhibits two images of a $z = 2.89$ quasar, with an image separation of $1{\farcs}832 \pm 0.007$ .
Bart Pindor +16 more
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The Astrophysical JournalThis paper investigates the physical conditions of the circumgalactic medium of L ^⋆ galaxies through explorations of observed ion tracer gas kinematics and comparisons of observations to different ionization models.
Samantha L. Garza +6 more
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The gas and stellar mass of low-redshift damped Lyman-$\alpha$ absorbers
, 2017 We report Hubble Space Telescope Cosmic Origins Spectrograph far-ultraviolet and Arecibo Telescope H{\sc i} 21cm spectroscopic studies of six damped and sub-damped Lyman-$\alpha$ absorbers (DLAs and sub-DLAs, respectively) at $z \lesssim 0.1$, that have ...
Ghosh, Tapasi +3 more
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The Astrophysical JournalHow do galaxies of different luminosities contribute to the metal absorber populations of varying species and strength? We present our analysis of the predicted metal contributions from galaxies as observed in quasar absorption line spectra during the ...
Samir Kušmić +3 more
doaj +1 more source
, 2000 There is considerable evidence that powerful radio quasars and radio galaxies are orientation-dependent manifestations of the same parent population: massive spheroids containing correspondingly massive black holes.
Fosbury, R. A. E.
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Circumnuclear Gas of a Quasar in Absorption and Emission Lines
The Astrophysical JournalWe present a detailed analysis of the unusual absorption- and emission-line spectrum of the quasar SDSS J074850.39+442439.0 (hereafter J0748+4424) at a redshift of z = 2.18. The archival SDSS optical spectrum is abundant in narrow absorption lines (NALs)
Xuejie Dai +12 more
doaj +1 more source
The Pittsburgh Sloan Digital Sky Survey MgII Quasar Absorption-Line Survey Catalog
, 2011 We present a catalog of intervening MgII quasar absorption-line systems in the redshift interval 0.36
Abazajian +39 more
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The Distance to the Magellanic Stream: Constraints from Optical Absorption along Stellar Sight Lines
The Astrophysical JournalThe Magellanic Stream is a large tail of neutral and ionized gas originating from tidal and hydrodynamical interactions between the Magellanic Clouds as they orbit the Milky Way (MW).
Sapna Mishra +4 more
doaj +1 more source
Peculiar Broad Absorption Line Quasars found in DPOSS
, 2003 With the recent release of large (i.e., > hundred million objects), well-calibrated photometric surveys, such as DPOSS, 2MASS, and SDSS, spectroscopic identification of important targets is no longer a simple issue. In order to enhance the returns from a
A. A. Mahabal +13 more
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