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(Nearly) Model-Independent Constraints on the Neutral Hydrogen Fraction in the Intergalactic Medium at Using Dark Pixel Fractions in Ly and Ly Forests
Xiangyu Jin, Jinyi Yang, Xiaohui Fan +10
Cosmic reionization was the last major phase transition of hydrogen from neutral to highly ionized in the intergalactic medium (IGM). Current observations show that the IGM is sign…
Accretion from Winds of Red Giant Branch Stars May Reveal the Supermassive Black Hole in Leo I
Fabio Pacucci, Abraham Loeb
A supermassive black hole (SMBH) of was recently detected via dynamical measurements at the center of the dwarf galaxy Leo I. Standing o…
A vast population of wandering and merging IMBHs at cosmic noon
Tiziana Di Matteo, Yueying Ni, Nianyi Chen +5
Massive black holes in the centers of galaxies today must have grown by several orders of magnitude from seed black holes formed at early times. Detecting a population of intermedi…
Orbital and Radiative Properties of Wandering Intermediate-Mass Black Holes in the ASTRID Simulation
Emma Jane Weller, Fabio Pacucci, Yueying Ni +4
Intermediate-Mass Black Holes (IMBHs) of are commonly found at the center of dwarf galaxies. Simulations and observations convincingly show that a sizable po…
The Two Galaxy Candidates HD1 and HD2 Are Likely Not Lensed
Rui Zhe Lee, Fabio Pacucci, Priyamvada Natarajan +1
The discovery of two UV-bright galaxy candidates at , HD1 and HD2, laid the foundation for a new race to study the early Universe. Previous investigations suggested that…
Observational Signatures of Massive Black Hole Progenitor Pathways: Could Leo I a Smoking Gun?
John A. Regan, Fabio Pacucci, M. J. Bustamante-Rosell
Observational evidence is mounting regarding the population demographics of Massive Black Holes (MBHs), from the most massive cluster galaxies down to the dwarf galaxy regime. Howe…
BASS XXII: The BASS DR2 AGN Catalog and Data
Michael J. Koss, Claudio Ricci, Benny Trakhtenbrot +32
We present the AGN catalog and optical spectroscopy for the second data release of the Swift BAT AGN Spectroscopic Survey (BASS DR2). With this DR2 release we provide 1425 optical…
BAT AGN Spectroscopic Survey XXI: The Data Release 2 Overview
Michael J. Koss, Benny Trakhtenbrot, Claudio Ricci +24
The BAT AGN Spectroscopic Survey (BASS) is designed to provide a highly complete census of the key physical parameters of supermassive black holes (SMBHs) that power local active g…
Lensing in the Darkness: A Bayesian Analysis of 22 Chandra Sources at Shows No Evidence of Lensing
Fabio Pacucci, Adi Foord, Lucia Gordon +1
More than quasars have been detected so far at , with only one showing clear signs of strong gravitational lensing. Some studies call for a missing population of lense…
Cosmology with the Laser Interferometer Space Antenna
Pierre Auclair, David Bacon, Tessa Baker +177
The Laser Interferometer Space Antenna (LISA) has two scientific objectives of cosmological focus: to probe the expansion rate of the universe, and to understand stochastic gravita…
Detectability of Wandering Intermediate-Mass Black Holes in the Milky Way Galaxy from Radio to X-rays
Bryan Seepaul, Fabio Pacucci, Ramesh Narayan
Intermediate-mass black holes (IMBHs, ), are typically found at the center of dwarf galaxies and might be wandering, thus far undetected, in the Milky Way…
Astrophysics with the Laser Interferometer Space Antenna
Pau Amaro Seoane, Jeff Andrews, Manuel Arca Sedda +156
The Laser Interferometer Space Antenna (LISA) will be a transformative experiment for gravitational wave astronomy, and, as such, it will offer unique opportunities to address many…
Prospects to Explore High-redshift Black Hole Formation with Multi-band Gravitational Waves Observatories
Hsin-Yu Chen, Angelo Ricarte, Fabio Pacucci
The assembly of massive black holes in the early universe remains a poorly constrained open question in astrophysics. The merger and accretion of light seeds (remnants of Populatio…
Dynamics of Intermediate-Mass Black Holes Wandering in the Milky Way Galaxy Using the Illustris TNG50 Simulation
Emma Jane Weller, Fabio Pacucci, Lars Hernquist +1
The detection of Intermediate-Mass Black Holes (IMBHs) in dwarf galaxies is crucial to closing the gap in the wide mass distribution of black holes ( to $\…
Are the Newly-Discovered Drop-out Sources Starburst Galaxies or Quasars?
Fabio Pacucci, Pratika Dayal, Yuichi Harikane +2
The detection of two galaxy candidates has opened a new window on galaxy formation at an era only Myr after the Big Bang. Here, we investigate the physical nature…