Results 61 to 70 of about 10,836 (194)

A Classification Scheme for Quasar Absorption Lines

The Astrophysical Journal
We present a method to classify intergalactic absorption lines and apply it to 10,772 low-redshift systems. The classification gives the number of components (reflecting the kinematics) in four different ionization phases, using detections and ...
Benjamin E. Rosenwasser, Bart P. Wakker, Blair D. Savage   +2 more
doaj   +1 more source

Gemini GNIRS near-infrared spectroscopy of 50 quasars at z>~5.7

, 2019
We report initial results from a large Gemini program to observe z>~5.7 quasars with GNIRS near-IR spectroscopy. Our sample includes 50 quasars with simultaneous ~0.85-2.5 micron spectra covering the rest-frame ultraviolet and major broad emission lines ...
Banados, Eduardo, Fan, Xiaohui, Ho, Luis C., Jiang, Linhua, Riechers, Dominik A., Shen, Yue, Strauss, Michael A., Venemans, Bram, Vestergaard, Marianne, Walter, Fabian, Wang, Feige, Willott, Chris, Wu, Jin, Wu, Xue-Bing, Yang, Jinyi   +14 more
core   +1 more source

H I 21 cm Absorption Associated with Foreground Galaxies on Top of Quasars

The Astrophysical Journal
A systematic search for H i 21 cm absorption in quasar–galaxy pairs (QGPs) provides a powerful means to map the distribution of cold gas around high-redshift star-forming galaxies.
Labanya K. Guha, Raghunathan Srianand, Rajeshwari Dutta   +2 more
doaj   +1 more source

DESI Survey Validation Data in the COSMOS/Hyper Suprime-Cam Field: Cool Gas Trace Main-sequence Star-forming Galaxies at the Cosmic Noon

The Astrophysical Journal, 2023
We present the first result in exploring the gaseous halo and galaxy correlation using the Dark Energy Spectroscopic Instrument survey validation data in the Cosmic Evolution Survey (COSMOS) and Hyper Suprime-Cam field.
Siwei Zou, Linhua Jiang, Zheng Cai, John Moustakas, Zechang Sun, Zhiwei Pan, Jiani Ding, Jaime E. Forero-Romero, Hu Zou, Yuan-sen Ting, Matthew Pieri, Steven Ahlen, David Alexander, David Brooks, Arjun Dey, Andreu Font-Ribera, Satya Gontcho A. Gontcho, Klaus Honscheid, Martin Landriau, Axel de la Macorra, Mariana Vargas Magana, Aaron Meisner, Ramon Miquel, Michael Schubnell, Gregory Tarlé, Zhimin Zhou   +25 more
doaj   +1 more source

Implications of Dramatic Broad Absorption Line Variability in the Quasar FBQS J1408+3054

, 2010
We have observed a dramatic change in the spectrum of the formerly heavily absorbed `overlapping-trough' iron low-ionization broad absorption line (FeLoBAL) quasar FBQS J1408+3054.
Abazajian, Allen, Arav, Arav, Becker, Becker, Becker, Bentz, Boroson, Boroson, Brotherton, Canalizo, Crenshaw, D. P. Schneider, de Kool, Doi, Everett, Farrah, Farrah, Filippenko, Gallagher, Gallagher, Ganguly, Gibson, Gibson, Gibson, Gregg, Gregg, Gregg, Hall, Hall, Hamann, Hill, Hovatta, K. Anosov, Knigge, Kraemer, Kraemer, Kurosawa, Lasker, Leighly, Lewis, Low, Lundgren, M. D. Gregg, Martini, Miller, Misawa, Monet, Moore, Morrissey, Mshar, Murray, Murray, Ogle, Onken, P. B. Hall, Priddey, Proga, Proga, Proga, Proga, R. H. Becker, R. L. White, R. R. Gibson, Reichard, Richards, Richards, Risaliti, Schmidt, Shakura, Sheinis, Shen, Skrutskie, Smith, Sprayberry, Trump, Urrutia, Voit, Véron-Cetty, W. N. Brandt, Wang, Weymann, White, White, Willott, Woods, York, Zhang, Zhang   +89 more
core   +1 more source

Comprehensive Connection among the Quasars with Different Types of Outflow Absorption Lines

The Astrophysical Journal
It is commonly accepted that outflows from the central regions of quasars play a substantial role in regulating the global properties of the host galaxy. These outflows are typically detected through blueshifted absorption lines.
Xing-Long Peng, Zhi-Fu Chen, Zhi-Cheng He, Ting-Ting Pang, Zhi-Wen Wang   +4 more
doaj   +1 more source

On the Metallicities and Kinematics of the Circumgalactic Media of Damped Lyα Systems at z ∼ 2.5

The Astrophysical Journal, 2023
We use medium- and high-resolution spectroscopy of close pairs of quasars to analyze the circumgalactic medium (CGM) surrounding 32 damped Ly α absorption systems (DLAs). The primary quasar sightline in each pair probes an intervening DLA in the redshift
Stephanie M. Urbano Stawinski, Kate H. R. Rubin, J. Xavier Prochaska, Joseph F. Hennawi, Nicolas Tejos, Michele Fumagalli, Marc Rafelski, Evan N. Kirby, Elisabeta Lusso, Zachary Hafen   +9 more
doaj   +1 more source

A new 21-cm absorber identified with an $L \sim L^\star$ galaxy

, 2001
We present Giant Metrewave Radio Telescope (GMRT) observations of redshifted 21-cm absorption from the $z=0.437$ metal line absorption system towards PKS 1243-072.
Bowen, Centurión, Chengalur, Cohen, Dessauges-Zavadsky, Haehnelt, J. N. Chengalur, Kanekar, Landolt, Lane, Le Brun, N. Kanekar, Pettini, Prochaska, R. M. Athreya, Rao, Rao, Rola, Storrie-Lombardi, Storrie-Lombardi, Tresse, Turnshek, Wilkes, Wolfire, Wright   +24 more
core   +1 more source

Microlensing Constraints on Broad Absorption and Emission Line Flows in the Quasar H1413+117 [PDF]

, 2015
We present new integral field spectroscopy of the gravitationally lensed broad absorption line (BAL) quasar H1413+117, covering the ultraviolet to visible rest-frame spectral range.
Bate, Nicholas F., Labrie, Kathleen, O'Dowd, Matthew J., Rogers, Joshua, Webster, Rachel L.   +4 more
core   +2 more sources

The Circumgalactic Medium Traced by Mg ii Absorption with DESI: Dependence on Galaxy Stellar Mass, Star Formation Rate, and Azimuthal Angle

The Astrophysical Journal
Understanding the circumgalactic medium (CGM) distribution of galaxies is the key to revealing the dynamical exchange of materials between galaxies and their surroundings.
Zeyu Chen, Enci Wang, Hu Zou, Siwei Zou, Yang Gao, Huiyuan Wang, Haoran Yu, Cheng Jia, Haixin Li, Chengyu Ma, Yao Yao, Weiyu Ding, Runyu Zhu   +12 more
doaj   +1 more source