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106 papers
A Robust Estimator for the Lyman- Forest 1D Power Spectrum at High Redshift
Molly Wolfson, Joseph F. Hennawi, Frederick B. Davies +1
The Lyman- (Ly) forest flux power spectrum is sensitive to a range of astrophysical and cosmological effects, including the thermal state of and large-scale fluctuatio…
The Light Echo of a High-Redshift Quasar mapped with Lyman- Tomography
Anna-Christina Eilers, Minghao Yue, Jorryt Matthee +11
Ultra-violet (UV) radiation from accreting black holes ionizes the intergalactic gas around early quasars, carving out highly ionized bubbles in their surroundings. Any changes in…
First constraints on the local ionization topology in front of two quasars at z ~ 7.5
Timo Kist, Joseph F. Hennawi, Frederick B. Davies +10
Thus far, Lyman- damping wings towards quasars have been used to probe the \textit{global} ionization state of the foreground intergalactic medium (IGM). A new parameterization…
Inferring local quasar IGM damping wing constraints
Timo Kist, Joseph F. Hennawi, Frederick B. Davies
Lyman- damping wings towards quasars are a highly sensitive probe of the neutral hydrogen (HI) content in the foreground intergalactic medium (IGM), not only constraining the gl…
Quasar lifetime measurements from extended Ly nebulae at
Dominika Ďurovčíková, Anna-Christina Eilers, Romain A. Meyer +7
The existence of billion-solar-mass black holes hosted in luminous quasars within the first gigayear of cosmic history poses a challenge to our understanding of supermassive black…
A local, topology-independent parameterization of quasar IGM damping wings
Timo Kist, Joseph F. Hennawi, Frederick B. Davies
Lyman- damping wings towards quasars provide a unique probe of reionization because their strength correlates strongly with the global volume-averaged neutral hydrogen (HI) frac…
Quantifying the Precision of IGM Damping Wing Measurements Towards Quasars
Timo Kist, Joseph F. Hennawi, Frederick B. Davies
We investigate the precision with which the Lyman- damping wing signature imprinted on the spectra of high-redshift quasars (QSOs) by the foreground neutral intergalactic medium…
Precisely Measuring the Cosmic Reionization History from IGM Damping Wings Towards Quasars
Joseph F. Hennawi, Timo Kist, Frederick B. Davies +1
We introduce a new approach for analyzing the IGM damping wings imprinted on the proximity zones of quasars in the epoch of reionization (EoR). Whereas past work has typically forg…
A Spatially Resolved [CII] Survey of 31 Massive Galaxies Hosting Luminous Quasars
Feige Wang, Jinyi Yang, Xiaohui Fan +15
The [CII] 158 m emission line and the underlying far-infrared (FIR) dust continuum are important tracers for studying star formation and kinematic properties of early galaxies.…
A Massive Protocluster Anchored by a Luminous Quasar at
Feige Wang, Jinyi Yang, Joseph F. Hennawi +13
Protoclusters, the progenitors of galaxy clusters, trace large scale structures in the early Universe and are important to our understanding of structure formation and galaxy evolu…
Recognizing Blazars Using Radio Morphology from the VLA Sky Survey
Zhang-Liang Xie, Eduardo Banados, Silvia Belladitta +4
Blazars are radio-loud Active Galactic Nuclei (AGN) whose jets have a very small angle to our line of sight. Observationally, the radio emission are mostly compact or a compact-cor…
Constraints on the Evolution of the Ionizing Background and Ionizing Photon Mean Free Path at the End of Reionization
Frederick B. Davies, Sarah E. I. Bosman, Prakash Gaikwad +16
The variations in Ly forest opacity observed at between lines of sight to different background quasars are too strong to be caused by fluctuations in the density field a…
Signatures of Small-scale Structure of the Pre-reionization Intergalactic Medium in Quasar Proximity Zones
Frederick B. Davies, Joseph F. Hennawi
The small-scale structure of baryons in the intergalactic medium is intimately linked to their past thermal history. Prior to the K photoheating during the epoch of r…
Possible Contamination of the Intergalactic Medium Damping Wing in ULAS J1342+0928 by Proximate Damped Ly Absorption
Frederick B. Davies, Eduardo Bañados, Joseph F. Hennawi +1
The red damping wing from neutral hydrogen in the intergalactic medium is a smoking-gun signal of ongoing reionization. One potential contaminant of the intergalactic damping wing…
The impact of varying inhomogeneous reionization histories on metrics of Ly opacity
Caitlin C. Doughty, Joseph F. Hennawi, Jose Oñorbe +2
The epoch of hydrogen reionization is complete by , but its progression at higher redshifts is uncertain. Measurements of Ly forest opacity show large scatter at , sug…
Searching for the Imprints of AGN Feedback on the Lyman Alpha Forest Around Luminous Red Galaxies
Vikram Khaire, Teng Hu, Joseph F. Hennawi +3
We explore the potential of using the low-redshift Lyman- (Ly) forest surrounding luminous red galaxies (LRGs) as a tool to constrain active galactic nuclei (AGN) feedback mo…
Forecasting constraints on the high-z IGM thermal state from the Lyman- forest flux auto-correlation function
Molly Wolfson, Joseph F. Hennawi, Frederick B. Davies +2
The auto-correlation function of the Lyman- (Ly) forest flux from high-z quasars can statistically probe all scales of the intergalactic medium (IGM) just after the epoch of…
Measurements of the Lyman- forest flux auto-correlation functions from the extended XQR-30 data set
Molly Wolfson, Joseph F. Hennawi, Sarah E. I. Bosman +14
Recently, the Lyman- (Ly) forest flux auto-correlation function has been shown to be sensitive to the mean free path of hydrogen-ionizing photons, , for simul…
The Impact of the WHIM on the IGM Thermal State Determined from the Low- Lyman- Forest
Teng Hu, Vikram Khaire, Joseph F. Hennawi +4
At , shock heating caused by large-scale velocity flows and possibly violent feedback from galaxy formation, converts a significant fraction of the cool gas ($T\sim 1…
The relationship between IGM Lyman-alpha opacity and galaxy density near the end of reionization
Holly M. Christenson, George D. Becker, Anson D'Aloisio +6
Observed scatter in the Lyman-alpha opacity of quasar sightlines at has motivated measurements of the correlation between Ly opacity and galaxy density, as models that pre…
First measurement of the Mg II forest correlation function in the Epoch of Reionization
Suk Sien Tie, Joseph F. Hennawi, Feige Wang +5
In the process of producing the roughly three ionizing photons per atom required to reionize the IGM, the same massive stars explode and eject metals into their surroundings. While…
Probing Ultra-late Reionization: Direct Measurements of the Mean Free Path over
Yongda Zhu, George D. Becker, Holly M. Christenson +22
The mean free path of ionizing photons, , is a critical parameter for modeling the intergalactic medium (IGM) both during and after reionization. We present direct mea…
XQR-30: the ultimate XSHOOTER quasar sample at the reionization epoch
Valentina D'Odorico, E. Banados, G. D. Becker +46
The final phase of the reionization process can be probed by rest-frame UV absorption spectra of quasars at z>6, shedding light on the properties of the diffuse intergalactic mediu…
Can the Low Redshift Lyman Alpha Forest Constrain AGN Feedback Models?
Vikram Khaire, Teng Hu, Joseph F. Hennawi +2
We investigate the potential of low-redshift Lyman alpha (Ly) forest for constraining active galactic nuclei (AGN) feedback models by analyzing the Illustris and IllustrisTNG si…