359 citations · 4.2k across the 145 of their papers we have counts for
18 papers · 1 filter
The emergence of X-ray emission lines during relativistic radio-jet formation in the changing-look active galactic nucleus 1ES 1927+654
Dev R. Sadaula, Sibasish Laha, Eileen T. Meyer +27
We present results from a comprehensive multi-wavelength monitoring campaign of the changing-look active galactic nucleus 1ES 1927+654 during the onset and evolution of a relativis…
The Advanced X-ray Imaging Satellite (AXIS) Community Science Book
Michael Koss, Nafisa Aftab, Steven W. Allen +395
The AXIS Community Science Book represents the collective effort of 592 scientists worldwide to define the transformative science enabled by the Advanced X-ray Imaging Satellite (A…
Multi-wavelength observations of a jet launch in real time from the post-changing-look Active Galaxy 1ES 1927+654
Sibasish Laha, Eileen T. Meyer, Dev R. Sadaula +34
We present results from a high cadence multi-wavelength observational campaign of the enigmatic changing look AGN 1ES 1927+654 from May 2022- April 2024, coincident with an unprece…
Constraining Disk-to-Corona Power Transfer Fraction, Soft X-ray Excess Origin, and Black Hole Spin Population of Type-1 AGN across Mass Scales
Labani Mallick, Ciro Pinto, John Tomsick +6
Understanding the nature of the accretion disk, its interplay with the X-ray corona, and assessing black hole spin demographics remain open challenges in astrophysics. In this pape…
HOLESOM: Constraining the Properties of Slowly-Accreting Massive Black Holes with Self-Organizing Maps
Valentina La Torre, Fabio Pacucci
Accreting massive black holes (MBHs, with M M) are known for their panchromatic emission, spanning from radio to gamma rays. While MBHs accreting at sign…
The case for super-Eddington accretion in JWST broad-line AGN during the first billion years
Erini Lambrides, Rebecca Larson, Kristen Garofali +23
A multitude of JWST studies reveal a surprising over-abundance of over-massive accreting super-massive black holes (SMBHs) -- leading to a deepening tension between theory and obse…
Constraining Wind-Driven Accretion Onto Gaia BH3 With Chandra
Nico Cappelluti, Fabio Pacucci, Günther Hasinger
Gaia BH3 is the most massive known stellar-origin black hole in the Milky Way, with a mass . Detected from Gaia's astrometry, this black hole i…
Mildly Super-Eddington Accretion Onto Slowly-Spinning Black Holes Explains the X-Ray Weakness of the Little Red Dots
Fabio Pacucci, Ramesh Narayan
JWST has revealed a population of low-luminosity AGN at in compact, red hosts (the "Little Red Dots", or LRDs), which are largely undetected in X-rays. We investigate this ph…
The black hole occupation fraction of local dwarf galaxies with AXIS
Elena Gallo, Edmund Hodges-Kluck, Tommaso Treu +7
The fraction of local dwarf galaxies that hosts massive black holes is arguably the cleanest diagnostic of the dominant seed formation mechanism of today's supermassive black holes…
Surveying the onset and evolution of supermassive black holes at high-z with AXIS
Nico Cappelluti, Adi Foord, Stefano Marchesi +8
The nature and origin of supermassive black holes (SMBHs) remain an open matter of debate within the scientific community. While various theoretical scenarios have been proposed, e…
Tracking Supermassive Black Hole Mergers from kpc to sub-pc Scales with AXIS
Adi Foord, Nico Cappelluti, Tingting Liu +8
We present an analysis showcasing how the Advanced X-ray Imaging Satellite (AXIS), a proposed NASA Probe-class mission, will significantly increase our understanding of supermassiv…
First Detection of an Over-Massive Black Hole Galaxy UHZ1: Evidence for Heavy Black Hole Seed Formation from Direct Collapse
Priyamvada Natarajan, Fabio Pacucci, Angelo Ricarte +3
The recent Chandra-JWST discovery of a quasar in the z = 10.1 galaxy UHZ1 reveals that accreting supermassive black holes (SMBHs) were already in place 470 million years after the…
Detection Prospects of Local Super-Massive Black Holes Based on the Sloan-Digital Sky Survey
Nadav Joseph Outmezguine, Fabio Pacucci, Abraham Loeb
We use the Sloan-Digital Sky Survey quasar catalog to statistically infer the local abundance of black holes heavier than , which allows us to estimate the detection p…
Disentangling nature from nurture: tracing the origin of seed black holes
Priyamvada Natarajan, Angelo Ricarte, Vivienne Baldassare +16
The origin and properties of black hole seeds that grow to produce the detected population of supermassive black holes are unconstrained at present. Despite the existence of severa…
Electromagnetic Window into the Dawn of Black Holes
Zoltán Haiman, William N. Brandt, Alexey Vikhlinin +28
Massive 10^6-10^10 Msun black holes (BHs) are ubiquitous in local galactic nuclei. They were common by the time the Universe is several Gyr old, and many of them were in place with…
The Chandra COSMOS legacy survey: Energy Spectrum of the Cosmic X-ray Background and constraints on undetected populations
Nico Cappelluti, Yanxia Li, Angelo Ricarte +15
Using {\em Chandra} observations in the 2.15 deg COSMOS legacy field, we present one of the most accurate measurements of the Cosmic X-ray Background (CXB) spectrum to date i…
Shining in the Dark: the Spectral Evolution of the First Black Holes
Fabio Pacucci, Andrea Ferrara, Marta Volonteri +1
Massive Black Hole (MBH) seeds at redshift are now thought to be key ingredients to explain the presence of the super-massive () bla…
Simulating the growth of Intermediate Mass Black Holes
Fabio Pacucci, Andrea Ferrara
Theoretical models predict that a population of Intermediate Mass Black Holes (IMBHs) of mass might form at high () redsh…