197 citations · 1.2k across the 24 of their papers we have counts for
25 papers
Detection of star formation in a near-pristine pocket of the Universe
Louise Welsh, Ryan Cooke, Michele Fumagalli +3
We detect two high-confidence star-forming sources in the environment of a chemically near-pristine ([Fe/H] Damped Ly system (DLA) using Keck/KCWI. These are found…
Constraining the density distribution of the cold Circumgalactic Medium of quasars at z>2 through Lya, HeII and Ha emission
Andrea Travascio, Sebastiano Cantalupo, Titouan Lazeyras +16
Extended Lya emission is routinely detected around high-redshift quasars, revealing large reservoirs of cool circumgalactic medium (CGM). Its resonant nature complicates interpreta…
Detection of metal absorption lines in quasar spectra: a neural network approach using U-Net
Elena Sofia Mangola, Francesco Pistis, Michele Fumagalli +7
Current and future large spectroscopic surveys are significantly enhancing the volume and resolution of quasar spectra that are observed, which requires the creation of efficient a…
The KAGG survey: KCWI Analysis of Gas around Galaxies at z~3-5
Grecco A. Oyarzún, Marc Rafelski, J. Xavier Prochaska +5
We present the KCWI Analysis of Gas around Galaxies (KAGG) survey of Ly emission around Damped Ly Absorbers (DLAs) at z~3-5 with the Keck Cosmic Web Imager (KCWI) integral-fi…
Cosmic web Ly emission in a sample of overdense regions
Davide Tornotti, Michele Fumagalli, Matteo Fossati +7
We present a complete and homogeneous analysis of the Ly emission properties of the cosmic web at as a function of the overdensity of Ly emitters (L…
The environmental dependence of the circumgalactic medium in a high-resolution cosmological simulation
Georg Herzog, Rajeshwari Dutta, Michele Fumagalli
There is increasing evidence from observations that the circumgalactic medium (CGM) of galaxies depends on the large-scale structure in which they are embedded. When probing the CG…
Forecast for the detectability of patchy hydrogen reionization in WEAVE-QSO measurements of the Lyman- forest power spectrum at redshift
Ke Ma, James S. Bolton, Vid Iršič +9
We present the first detailed forecasts for the detectability of patchy hydrogen reionization in the one-dimensional Ly forest power spectrum to be measured by the WEAVE-QSO sur…
The Qz5 Survey (I): How the HI Mass Density of the Universe Evolves With Cosmic Time
Grecco A. Oyarzún, Marc Rafelski, Lise Christensen +9
We report that the neutral hydrogen (HI) mass density of the Universe () increases with cosmic time since , peaks at , and then decreases toward $z \sim…
Modeling Mg II resonance doublet spectra from galaxy haloes at z 1
Seok-Jun Chang, Rajeshwari Dutta, Max Gronke +3
We investigate the properties of cold gas at around star-forming galaxies at using Mg II spectra through radiative transfer modeling. We utilize a comprehen…
Baryonic Ecosystem in Galaxies (BEINGMgII). Host Galaxies of Ultra-strong MgII Absorbers in Subaru Hyper Suprime-Cam Survey
Ravi Joshi, Sarbeswar Das, Michele Fumagalli +5
We study the galaxies hosting ultra-strong MgII (USMgII) absorbers at small impact parameters of 2" (5 - 20 kpc), spanning a redshift range of , using deep…
The MUSE Ultra Deep Field: A 5 Mpc stretch of the z 4 cosmic web revealed in emission
Davide Tornotti, Michele Fumagalli, Matteo Fossati +7
We detect Ly emission from a ~5 Mpc-long (comoving) portion of the cosmic web hosting an overdensity () of 19 Ly emitters (LAEs) at within the MUSE…
Star-Formation in Neutral Hydrogen Gas Reservoirs at Cosmic Noon
Dharmender, Ravi Joshi, Michele Fumagalli +3
We aim to constrain the average star formation associated with neutral hydrogen gas reservoirs at cosmic noon. Using a unprecedented sample of 1716 high column density Damped Ly-$α…
A survey of extremely metal-poor gas at cosmic noon: evidence of elevated [O/Fe]
Louise Welsh, Ryan Cooke, Michele Fumagalli +2
We aim to study the high-precision chemical abundances of metal-poor gas clouds at cosmic noon (2<z<4) and investigate the associated enrichment histories. We analyse the abundance…
Dissecting cold gas in a high-redshift galaxy using a lensed background quasar
J. -K. Krogager, P. Noterdaeme, J. M. O'Meara +9
We present a study of cold gas absorption from a damped Lyman- absorber (DLA) at redshift towards two lensed images of the quasar J144254.78+405535.5 at reds…
Two more, bright, z > 6 quasars from VST ATLAS and WISE
B. Chehade, A. C. Carnall, T. Shanks +10
Recently, Carnall et al. discovered two bright high redshift quasars using the combination of the VST ATLAS and WISE surveys. The technique involved using the 3-D colour plane i-z:…
WEAVE-QSO: A Massive Intergalactic Medium Survey for the William Herschel Telescope
M. M. Pieri, S. Bonoli, J. Chaves-Montero +12
In these proceedings we describe the WEAVE-QSO survey, which will observe around 400,000 high redshift quasars starting in 2018. This survey is part of a broader WEAVE survey to be…
The Neutral Hydrogen Cosmological Mass Density at z=5
Neil H. M. Crighton, Michael T. Murphy, J. Xavier Prochaska +8
We present the largest homogeneous survey of damped Lyman- systems (DLAs) using the spectra of 163 QSOs that comprise the Giant Gemini GMOS (GGG) survey. With this surve…
Directly imaging damped Ly-alpha galaxies at z>2. III: The star formation rates of neutral gas reservoirs at z~2.7
Michele Fumagalli, John M. O'Meara, J. Xavier Prochaska +2
We present results from a survey designed to probe the star formation properties of 32 damped Ly-alpha systems (DLAs) at z~2.7. By using the "double-DLA" technique that eliminates…
Metal-enriched, sub-kiloparsec gas clumps in the circumgalactic medium of a faint z = 2.5 galaxy
Neil H. M. Crighton, Joseph F. Hennawi, Robert A. Simcoe +5
We report the serendipitous detection of a 0.2 L, Lyman- emitting galaxy at redshift 2.5 at an impact parameter of 50 kpc from a bright background QSO sightline. A high-reso…
The Giant Gemini GMOS survey of z>4.4 quasars - I. Measuring the mean free path across cosmic time
Gábor Worseck, J. Xavier Prochaska, John M. O'Meara +7
We have obtained spectra of 163 quasars at with the Gemini Multi Object Spectrometers on the Gemini North and South telescopes, the largest publicly available s…
The Rapid Decline in Metallicity of Damped Ly-alpha Systems at z~5
Marc Rafelski, Marcel Neeleman, Michele Fumagalli +2
We present evidence that the cosmological mean metallicity of neutral atomic hydrogen gas shows a sudden decrease at z>4.7 down to <Z>=-2.03(+0.09-0.11), which is 6 sigma deviant f…
Towards a Unified Description of the Intergalactic Medium at Redshift z~2.5
J. Xavier Prochaska, Piero Madau, John M. O'Meara +1
We examine recent measurements of the z~2.5 intergalactic medium (IGM) which constrain the HI frequency distribution f(N) and the mean free path MFP to ionizing radiation. We argue…
Dissecting the properties of optically-thick hydrogen at the peak of cosmic star formation history
Michele Fumagalli, John M. O'Meara, J. Xavier Prochaska +1
We present results of a blind survey of Lyman limit systems (LLSs) detected in absorption against 105 quasars at z~3 using the blue sensitive MagE spectrograph at the Magellan Clay…
Confronting Simulations of Optically Thick Gas in Massive Halos with Observations at z=2-3
Michele Fumagalli, Joseph F. Hennawi, J. Xavier Prochaska +4
Cosmological hydrodynamic simulations predict the physical state of baryons in the circumgalactic medium (CGM), which can be directly tested via quasar absorption line observations…