21 citations · 49 across the 12 of their papers we have counts for
12 papers
The Challenge of Observing Patchy Reionization with CMB Optical-Depth Fluctuations
Nick Takoudes, Hanjue Zhu, Nickolay Y. Gnedin
Spatial fluctuations in the Thomson optical depth encode information about the inhomogeneous nature of cosmic reionization. We compute the optical-depth angular power spectrum, $C_…
The Last Crossing in Excursion-Set Theory of Cosmic Reionization
Hanjue Zhu
I introduce the last crossing of the photon-counting barrier as a statistic for analytical models of cosmic reionization. Because ionizing galaxies are biased tracers of density an…
Damping Wing-Like Features in the Spectra of High Redshift Quasars: a Challenge for Fully-Coupled Simulations
Nickolay Y. Gnedin, Hanjue Zhu
Recently, several observational detections of damping-wing-like features at the edges of ``dark gaps" in the spectra of distant quasars (the ``Malloy-Lidz effect") have been report…
Cosmic Ray Mediated Thermal Fronts in the Warm-Hot Circumgalactic Medium
Hanjue Zhu, Ellen G. Zweibel, Nickolay Y. Gnedin
We investigate the 1D plane-parallel front connecting the warm ( K) and hot ( K) phases of the circumgalactic medium (CGM), focusing on the influence of cosmic rays (CR…
On the Physical Nature of Ly Transmission Spikes in High Redshift Quasar Spectra
Hanjue Zhu, Nickolay Gnedin, Camille Avestruz
We investigate Lyman-alpha (Ly) transmission spikes at using synthetic quasar spectra from the ``Cosmic Reionization On Computers" simulations. We focus on under…
Spatially Resolved Properties of Extraplanar Diffuse Ionized Gas in NGC3511 and NGC3513
Hanjue Zhu, Erin Boettcher, Hsiao-Wen Chen
Gaseous, disk-halo interfaces are shaped by processes that are critical to galaxy evolution, including gas accretion and outflows. Extraplanar diffuse ionized gas (eDIG) layers are…
Cosmic Reionization On Computers: Statistics, Physical Properties and Environment of Lyman Limit Systems at
Jiawen Fan, Hanjue Zhu, Camille Avestruz +1
Lyman limit systems (LLSs) are dense hydrogen clouds with high enough HI column densities to absorb Lyman continuum photons emitted from distant quasars. Their high column densitie…
Mass-Metallicity Relation during the Epoch of Reionization in the CROC Simulations
Isaac Noel, Hanjue Zhu, Nickolay Gnedin
The low-redshift mass-metallicity relation (MZR) is well studied, but the high-redshift MZR remains difficult to observe. To study the early MZR further, we analyze the Cosmic Reio…
Cosmic Reionization On Computers: Baryonic Effects on Halo Concentrations During the Epoch of Reionization
Hanjue Zhu, Nickolay Y. Gnedin
Baryons both increase halo concentration through adiabatic contraction and expel mass through feedback processes. However, it is not well understood how the radiation fields preval…
Revealing the Galaxy-Halo Connection Through Machine Learning
Ryan Hausen, Brant E. Robertson, Hanjue Zhu +5
Understanding the connections between galaxy stellar mass, star formation rate, and dark matter halo mass represents a key goal of the theory of galaxy formation. Cosmological simu…
Gravitational couplings in Chameleon models
Macarena Lagos, Hanjue Zhu
We consider cosmological models where dark energy is described by a dynamical field equipped with the Chameleon screening mechanism, which serves to hide its effects in local dense…
Automated Lensing Learner: Automated Strong Lensing Identification with a Computer Vision Technique
Camille Avestruz, Nan Li, Hanjue Zhu +3
Forthcoming surveys such as the Large Synoptic Survey Telescope (LSST) and Euclid necessitate automatic and efficient identification methods of strong lensing systems. We present a…