52 citations · 181 across the 39 of their papers we have counts for
41 papers
Nearly pristine gas in a galaxy 1 billion years after the Big Bang
Sarah E. I. Bosman, Frederick B. Davies, Louise Welsh +22
Excitation of carbon and oxygen ions is the primary mechanism by which collapsing gas clouds dissipate heat to form new stars. At early cosmic times, in galaxies with chemically pr…
Stacking HI in the dark: Towards detecting the reionization-epoch 21 cm signal in Lyman- dark gaps
Barun Maity, Frederick B. Davies
The detection of the redshifted 21 cm signal from neutral hydrogen during the epoch of reionization remains one of the central challenges in contemporary cosmology. Although upcomi…
To be lensed or not to be lensed: on the nature of the alleged high-z lensed quasars J0109-5424 and P170+20
Aurora Mata-Sanchez, Emanuele P. Farina, Anniek J. Gloudemans +17
We present a detailed multi-wavelength analysis of two gravitationally lensed z>6 quasar candidates: J0109-5424 and P170+20. Using JWST/NIRSpec near-infrared data from the Aether s…
Quasar Impostors: Two Extremely UV-Bright () Reionisation-Epoch Galaxies Powered by Very Massive Stars
Daming Yang, Joseph F. Hennawi, Sarah E. I. Bosman +20
The extreme bright end of the galaxy UV luminosity function during reionisation remains poorly constrained, particularly where the galaxy and quasar luminosity functions overlap an…
Broad Paschen lines as black hole mass tracers: A reverberation mapping calibration
Shengxiu Sun, Sarah E. I. Bosman, Frederick B. Davies +4
Single-epoch (SE) black hole mass estimators based on rest-frame ultraviolet or optical broad lines can be limited by dust attenuation or wavelength coverage. We calibrate estimato…
Euclid: Discovery of 31 new quasars at
D. Yang, J. F. Hennawi, F. Guarneri +211
We report the discovery of 31 new high- quasars in the redshift range . These quasars were selected from approximately 3000 deg of sky covered during the firs…
The host halo masses of AGNs and quasars at with TNG-Cluster, FLAMINGO and other cosmological galaxy simulations
Akanksha Kapahtia, Annalisa Pillepich, Joey Braspenning +5
Most observations and clustering analyses suggest that quasars inhabit a narrow range of dark-matter halo masses ( M) across cosmic time (). Recen…
First-star imprints in a metal-poor galaxy overdensity near the end of reionization
Zihao Li, Koki Kakiichi, Lise Christensen +24
The first generation of stars, known as Population III (Pop III), formed from primordial gas consisting solely of hydrogen and helium and is believed to have emerged only a few hun…
Life After the Quasar: Overmassive Black Holes and Remnant Ionised Bubbles in and Around Two z~6.6 Galaxies
Romain A. Meyer, Pascal A. Oesch, Callum Witten +7
Supermassive black holes (SMBH, ) powering luminous quasars already exist one billion years after the Big Bang, yet their connection to their star-formi…
Persephone's Torch: A 15th Magnitude Quadruply-Lensed Quasar From the Couch Discovered with SPHEREx and the LBT
Frederick B. Davies, Eduardo Bañados, Sarah E. I. Bosman +4
Here we report the spectroscopic and geometric confirmation of an extremely bright () and compact (Einstein radius of ) quadruply-lensed quasar at , J1…
Three Hundred Quasars from the Couch: A first look at high-redshift quasar discovery with SPHEREx
Frederick B. Davies, Sarah E. I. Bosman, Arpita Ganguly +9
Photometric selection of luminous high-redshift () quasars is plagued by contamination from numerous low-mass Galactic stars, reddened lower-redshift quasars, as well as…
The Keck/DEIMOS Stellar Archive: I. Uniform Velocities and Metallicities for 78 Milky Way Dwarf Galaxies and Globular Clusters
Marla Geha, Debora Pelliccia, J. Xavier Prochaska +5
We present a homogeneous spectroscopic dataset of 22,339 stars in 78 Milky Way dwarf galaxy satellites and globular clusters. All data were taken with the Keck II telescope and Dee…
ASPIRE: The Environments and Dark Matter Halos of Luminous Quasars in the Epoch of Reionization
Feige Wang, Jaclyn B. Champagne, Jiamu Huang +42
We present a systematic study of the environments of 25 luminous quasars at from the ASPIRE program. Using JWST/NIRCam WFSS data, we identified 487 galaxies at $5.3 \less…
Studying dark gaps in Ly- forest transmission with large reionization simulations
Barun Maity, Frederick B. Davies, Benedetta Spina +1
The physical conditions of the intergalactic medium (IGM) during the final stages of cosmic reionization () are not yet fully understood. Recent reports of unexpected…
Shedding the envelope: JWST reveals a kiloparsec-scale [OIII]-weak Balmer shell around a z=7.64 quasar
Julien Wolf, Eduardo Bañados, Xiaohui Fan +25
Luminous quasars at the redshift frontier z>7 serve as stringent probes of super-massive black hole formation and they are thought to undergo much of their growth obscured by dense…
Detecting the signature of helium reionization through 3HeII 3.46cm line-intensity mapping
Benedetta Spina, Cristiano Porciani, Sarah E. I. Bosman +4
Helium reionization is the most recent phase change of the intergalactic medium, yet its timing and main drivers remain uncertain. Among the probes to trace its unfolding, the 3.46…
A close look at the black hole masses and hot dusty toruses of the first quasars with MIRI-MRS
Sarah E. I. Bosman, Javier Álvarez-Márquez, Frederick B. Davies +29
The presence of supermassive black holes (SMBHs, ) at remains a puzzle. While their existence appears to require exotic formation or growth proce…
Updated dark pixel fraction constraints on reionization's end from the Lyman-series forests of XQR-30
Frederick B. Davies, Sarah E. I. Bosman, Valentina D'Odorico +16
The fraction of "dark pixels" in the Ly and other Lyman-series forests at provides a powerful constraint on the end of the reionization process. Any spectral region…
BEES: Quasar lifetime measurements from extended rest-optical emission line nebulae at
Dominika Ďurovčíková, Anna-Christina Eilers, Yuzo Ishikawa +13
Measurements of quasar lifetimes at high redshift indicate that the earliest billion-solar-mass supermassive black holes (SMBHs) have only been active as luminous quasars for less…
A first look at quasar-galaxy clustering at
Jan-Torge Schindler, Joseph F. Hennawi, Frederick B. Davies +8
We present JWST observations of the environments surrounding two high-redshift quasars, J02520503 at and J10072115 at , which enable the first constraints…
Measuring the IGM correlation length at 5<z<6.1: a fast change at the end of Reionization
Benedetta Spina, Sarah E. I. Bosman, Barun Maity +1
The Lyman- forest of high redshift quasars is a powerful probe of the late stages of the Epoch of Reionization (EoR), particularly through the presence of Gunn-Peterson troughs.…
Escape fractions from unattenuated Ly emitters around luminous quasars
Minghao Yue, Anna-Christina Eilers, Jorryt Matthee +7
Ionized proximity zones around luminous quasars provide a unique laboratory to characterize the Ly emission lines from galaxies without significant attenuation from the in…
Discovery and characterization of 25 new quasars at 4.6 < z < 6.9 from wide-field multi-band surveys
Silvia Belladitta, Eduardo Bañados, Zhang-Liang Xie +18
Luminous quasars at provide key insights into the early Universe. Their rarity necessitates wide-field multi-band surveys to efficiently separate them from the main astrophys…
Efficient Modelling of Lyman-α opacity fluctuations during late reionization epoch
Barun Maity, Frederick Davies, Prakash Gaikwad
The Lyman- forest opacity fluctuations observed from high-redshift quasar spectra have been proven to be extremely successful in order to probe the late phase of the reionizatio…