369 citations · 1.5k across the 20 of their papers we have counts for
21 papers
Probing the cosmic web with fast radio bursts: II. Scintillation
Sharon Lapiner, Nir Mandelker, Paz Beniamini +1
We consider the formation of multiphase gas in cosmic web objects (CWOs) through cooling and fragmentation within the shock-heated medium of cosmic sheets and filaments, and the ci…
Probing the Cosmic Web with Fast Radio Bursts. I. Scattering
Sharon Lapiner, Nir Mandelker, Paz Beniamini +1
We study the formation of multiphase gas in the post-accretion-shock regions of cosmic sheets, filaments, and the circumgalactic medium (CGM) of haloes, i.e., cosmic web objects (C…
From Feedback-Free Star Clusters to Little Red Dots via Compaction
Avishai Dekel, Dhruba Dutta Chowdhury, Sharon Lapiner +6
We address the origin of the Little Red Dots (LRDs) seen by JWST at cosmic morning () as compact stellar systems with over-massive black holes (BHs). We propose…
From FFB Starbursts at Cosmic Dawn to Quenching at Cosmic Morning: Hi-z Galaxy Bimodality
Avishai Dekel, Nir Mandelker, Zhaozhou Li +5
We propose a mass-dependent bimodality in the early evolution of galaxies. The massive track connects the super-bright galaxies at cosmic dawn () to the super-massive quiesc…
Mini-quenching of galaxies by bursty star formation
Tibor Dome, Sandro Tacchella, Anastasia Fialkov +5
The recent reported discovery of a low-mass and an intermediate-mass quenched galaxy with JWST/NIRSpec is the first evidence of halted star formation above $z\appro…
Wet Compaction to a Blue Nugget: a Critical Phase in Galaxy Evolution
Sharon Lapiner, Avishai Dekel, Jonathan Freundlich +6
We utilize high-resolution cosmological simulations to reveal that high-redshift galaxies tend to undergo a robust `wet compaction' event when near a `golden' stellar mass of $\sim…
Effects of feedback on galaxies in the VELA simulations: elongation, clumps and compaction
Daniel Ceverino, Nir Mandelker, Gregory F. Snyder +5
The evolution of star-forming galaxies at high redshifts is very sensitive to the strength and nature of stellar feedback. Using two sets of cosmological, zoom-in simulations from…
Core Formation in High-z Massive Haloes: Heating by Post Compaction Satellites and Response to AGN Outflows
Avishai Dekel, Jonathan Freundlich, Fangzhou Jiang +6
Observed rotation curves in star-forming galaxies indicate a puzzling dearth of dark matter in extended flat cores within haloes of mass at . T…
Compaction-Driven Black Hole Growth
Sharon Lapiner, Avishai Dekel, Yohan Dubois
We study the interplay between galaxy evolution and central black-hole (BH) growth using the {NewHorizon} cosmological simulation. BH growth is slow when the dark-matter halo is be…
Evaluating Galaxy Dynamical Masses From Kinematics and Jeans Equilibrium in Simulations
Michael Kretschmer, Avishai Dekel, Jonathan Freundlich +3
We provide prescriptions to evaluate the dynamical mass () of galaxies from kinematic measurements of stars or gas using analytic considerations and the VELA suite of…
The Dekel-Zhao profile: A mass-dependent dark-matter density profile with flexible inner slope and analytic potential, velocity dispersion, and lensing properties
Jonathan Freundlich, Fangzhou Jiang, Avishai Dekel +6
We explore a function with two shape parameters for the dark-matter halo density profile subject to baryonic effects, which is a special case of the general Zhao family of models a…
Origin of Star-Forming Rings around Massive Centres in Massive Galaxies at
Avishai Dekel, Sharon Lapiner, Omri Ginzburg +9
Using analytic modeling and simulations, we address the origin of an abundance of star-forming, clumpy, extended gas rings about massive central bodies in massive galaxies at $z \!…
A mass threshold for galactic gas discs by spin flips
Avishai Dekel, Omri Ginzburg, Fangzhou Jiang +4
We predict, analytically and by simulations, that gas discs tend to survive only in haloes above a threshold mass (stellar mass )…
A model for core formation in dark matter haloes and ultra diffuse galaxies by outflow episodes
Jonathan Freundlich, Avishai Dekel, Fangzhou Jiang +5
We present a simple model for the response of a dissipationless spherical system to an instantaneous mass change at its center, describing the formation of flat cores in dark matte…
Multi-Filament Inflows Fueling Young Star Forming Galaxies
D. Christopher Martin, Donal O'Sullivan, Mateusz Matuszweski +13
Theory suggests that there are two primary modes of accretion through which dark matter halos acquire the gas to form and fuel galaxies, hot and cold mode accretion. In cold mode a…
Origin of the Golden Mass of Galaxies and Black Holes
Avishai Dekel, Sharon Lapiner, Yohan Dubois
We address the origin of the golden mass and time for galaxy formation and the onset of rapid black-hole growth. The preferred dark-halo mass of ~ is translated to…
Deep Learning Identifies High-z Galaxies in a Central Blue Nugget Phase in a Characteristic Mass Range
M. Huertas-Company, J. R. Primack, A. Dekel +11
We use machine learning to identify in color images of high-redshift galaxies an astrophysical phenomenon predicted by cosmological simulations. This phenomenon, called the blue nu…
Is the dark-matter halo spin a predictor of galaxy spin and size?
Fangzhou Jiang, Avishai Dekel, Omer Kneller +8
The similarity between the distributions of spins for galaxies () and for dark-matter haloes (), indicated both by simulations and observations, is naively in…
Evolution of Galaxy Shapes from Prolate to Oblate through Compaction Events
Matteo Tomassetti, Avishai Dekel, Nir Mandelker +6
We study the evolution of global shapes of galaxies using cosmological simulations. The shapes refer to the components of dark matter (DM), stars and gas at the stellar half-mass r…
The Confinement of Star-Forming Galaxies into a Main Sequence through Episodes of Gas Compaction, Depletion, and Replenishment
Sandro Tacchella, Avishai Dekel, C. Marcella Carollo +5
Using cosmological simulations, we address the properties of high-redshift star-forming galaxies (SFGs) across their main sequence (MS) in the plane of star-formation rate (SFR) ve…
Evolution of Density Profiles in High-z Galaxies: Compaction and Quenching Inside-Out
Sandro Tacchella, Avishai Dekel, C. Marcella Carollo +5
Using cosmological simulations, we address the interplay between structure and star formation in high-redshift galaxies via the evolution of surface density profiles. Our sample co…