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18 papers · 2 filters
Giant Metrewave Radio Telescope detection of associated HI 21cm absorption at towards TXS1954+513
J. N. H. S. Aditya, Nissim Kanekar, J. Xavier Prochaska +3
We have used the 610 MHz receivers of the Giant Metrewave Radio Telescope (GMRT) to detect associated HI 21cm absorption from the blazar TXS1954+513. The GMRT HI 21cm…
On the selection of damped Lyman alpha systems using MgII absorption at 2<z<4
T. A. M. Berg, S. L. Ellison, J. X. Prochaska +8
The XQ-100 survey provides optical and near infrared coverage of 36 blindly selected, intervening damped Lyman alpha systems (DLAs) at 2 < z < 4, simultaneously covering the MgII d…
Chemical abundances of damped Lyman alpha systems in the XQ-100 survey
T. A. M. Berg, S. L. Ellison, R. Sanchez-Ramirez +8
The XQ-100 survey has provided high signal-noise spectra of 100 redshift 3-4.5 quasars with the X-Shooter spectrograph. The metal abundances for 13 elements in the 41 damped Lyman…
MApping the Most Massive Overdensities (MAMMOTH) II -- Discovery of an Extremely Massive Overdensity BOSS1441 at
Zheng Cai, Xiaohui Fan, Fuyan Bian +10
Cosmological simulations suggest a strong correlation between high optical-depth Ly absorbers, which arise from the intergalactic medium (IGM), and 3-D mass overdensities on sca…
Discovery of an Enormous Ly nebula in a massive galaxy overdensity at
Zheng Cai, Xiaohui Fan, Yujin Yang +12
Enormous Ly Nebulae (ELANe), unique tracers of galaxy density peaks, are predicted to lie at the nodes and intersections of cosmic filamentary structures. Previous successful se…
The COS-Halos Survey: Origins of the Highly Ionized Circumgalactic Medium of Star-Forming Galaxies
Jessica K. Werk, J. Xavier Prochaska, Sebastiano Cantalupo +6
The total contribution of diffuse halo gas to the galaxy baryon budget strongly depends on its dominant ionization state. In this paper, we address the physical conditions in the h…
The Circumgalactic Medium of Submillimeter Galaxies. I. First Results from a Radio-Identified Sample
Hai Fu, J. F. Hennawi, J. X. Prochaska +14
We present the first results from an on-going survey to characterize the circumgalactic medium (CGM) of the massive high-redshift galaxies detected as submillimeter galaxies (SMGs)…
XQ-100: A legacy survey of one hundred 3.5 < z < 4.5 quasars observed with VLT/XSHOOTER
S. Lopez, V. D'Odorico, S. L. Ellison +23
We describe the execution and data reduction of the European Southern Observatory Large Programme "Quasars and their absorption lines: a legacy survey of the high-redshift universe…
Low-metallicity Absorbers Account for Half of the Dense Circumgalactic Gas at z < 1
Christopher B. Wotta, Nicolas Lehner, J. Christopher Howk +2
We present an analysis of the metallicity distribution of the dense circumgalactic medium (CGM) of galaxies at 0.1 < z < 1.1 as probed by partial Lyman limit systems (pLLSs, 16.1 <…
The survival of gas clouds in the Circumgalactic Medium of Milky Way-like galaxies
L. Armillotta, F. Fraternali, J. K. Werk +2
Observational evidence shows that low-redshift galaxies are surrounded by extended haloes of multiphase gas, the so-called 'circumgalactic medium' (CGM). To study the survival of r…
The Cosmic Evolution of the Metallicity Distribution of Ionized Gas Traced by Lyman Limit Systems
Nicolas Lehner, John M. O'Meara, J. Christopher Howk +2
We present the first results from our KODIAQ Z survey aimed to determine the metallicity distribution and physical properties of the z>2 partial and full Lyman limit systems (pLLSs…
The Optical Variability of SDSS Quasars from Multi-epoch Spectroscopy. III. A Sudden UV Cutoff in Quasar SDSS J2317+0005
Hengxiao Guo, Matthew A. Malkan, Minfeng Gu +6
We have collected near-infrared to X-ray data of 20 multi-epoch heavily reddened SDSS quasars to investigate the physical mechanism of reddening. Of these, J2317+0005 is found to b…
Nature and statistical properties of quasar associated absorption systems in the XQ-100 Legacy Survey
Serena Perrotta, Valentina D'Odorico, J. Xavier Prochaska +12
We statistically study the physical properties of a sample of narrow absorption line (NAL) systems looking for empirical evidences to distinguish between intrinsic and intervening…
First Connection between Cold Gas in Emission and Absorption: CO Emission from a Galaxy-Quasar Pair
M. Neeleman, J. X. Prochaska, M. A. Zwaan +7
We present the first detection of molecular emission from a galaxy selected to be near a projected background quasar using the Atacama Large Millimeter/submillimeter Array (ALMA).…
A Universal Density Structure for Circum-Galactic Gas
Jonathan Stern, Joseph F. Hennawi, J. Xavier Prochaska +1
We develop a new method to constrain the physical conditions in the cool (~10^4 K) circumgalactic medium (CGM) from measurements of ionic column densities, by assuming that the coo…
The UV-bright Quasar Survey (UVQS): DR1
TalaWanda R. Monroe, J. Xavier Prochaska, N. Tejos +5
We present the first data release (DR1) from our UV-bright Quasar Survey (UVQS) for new active galactic nuclei (AGN) across the sky. Using simple GALEX UV and WISE near-…
The HI Content of the Universe over the Past 10 Gyrs
Marcel Neeleman, J. Xavier Prochaska, Joseph Ribaudo +4
We use the Hubble Space Telescope (HST) archive of ultraviolet (UV) quasar spectroscopy to conduct the first blind survey for damped Ly-alpha absorbers (DLAs) at low redshift (z <…
Discovery of a Damped Lya Absorber at z = 3.3 along a galaxy sight-line in the SSA22 field
K. Mawatari, A. K. Inoue, K. Kousai +5
Using galaxies as background light sources to map the Lya absorption lines is a novel approach to study Damped Lya Absorbers (DLAs). We report the discovery of an intervening z = 3…