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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…
Convergence of small scale Ly structure at high- under different reionization scenarios
Caitlin C. Doughty, Joseph F. Hennawi, Frederick B. Davies +2
The Ly forest (LAF) at probes the thermal and reionization history of the intergalactic medium (IGM) and the nature of dark matter, but its interpretation requires compari…
A SPectroscopic survey of biased halos In the Reionization Era (ASPIRE): JWST Reveals a Filamentary Structure around a z=6.61 Quasar
Feige Wang, Jinyi Yang, Joseph F. Hennawi +56
We present the first results from the JWST ASPIRE program (A SPectroscopic survey of biased halos In the Reionization Era). This program represents an imaging and spectroscopic sur…
A SPectroscopic survey of biased halos In the Reionization Era (ASPIRE): A First Look at the Rest-frame Optical Spectra of Quasars Using JWST
Jinyi Yang, Feige Wang, Xiaohui Fan +53
Studies of rest-frame optical emission in quasars at have historically been limited by the wavelengths accessible by ground-based telescopes. The James Webb Space Telescope (…
Detecting and Characterizing Young Quasars. III. The Impact of Gravitational Lensing Magnification
Minghao Yue, Anna-Christina Eilers, Robert A. Simcoe +8
We test the impact of gravitational lensing on the lifetime estimates of seven high-redshift quasars at redshift . The targeted quasars are identified by their small obs…
On the recent discovery claim of a new quasar
Sarah E. I. Bosman, Frederick B. Davies, Eduardo Bañados
Koptelova et al. 2022 (K22) recently claimed a new quasar discovery at . After careful consideration of the publicly-available data underlying K22's claim, we find that the…
Measuring the photo-ionization rate, neutral fraction and mean free path of HI ionizing photons at from a large sample of XShooter and ESI spectra
Prakash Gaikwad, Martin G. Haehnelt, Frederick B. Davies +16
We measure the mean free path (), photo-ionization rate () and neutral fraction () of hydrogen in 12 redshif…
Examining the Decline in the C IV Content of the Universe over 4.3 < z < 6.3 using the E-XQR-30 Sample
Rebecca L. Davies, Emma Ryan-Weber, Valentina D'Odorico +12
Intervening CIV absorbers are key tracers of metal-enriched gas in galaxy halos over cosmic time. Previous studies suggest that the CIV cosmic mass density () decrease…