Sadegh Khochfar

Little Red Dots are Direct-Collapse Black Hole-Forming Galaxies

Daniel J. Whalen, Muhammad A. Latif, Konstantinos Topalakis, Fergus Cullen et autres

"Little Red Dots" (LRDs) at $4 < z < 8$ are one of the most challenging discoveries by JWST to date because their distinctive V-shaped spectra and compact morphologies (100 - 200 pc) defy conventional astrophysical interpretation. Previous attempts to explain LRDs …

Clustering effects on the dark siren determination of H 0: a simulation study

Marios Kalomenopoulos, Riccardo Barbieri, Sadegh Khochfar, J. R. Gair et autres

ABSTRACT We investigate the cosmological power of gravitational wave (GW) events without electromagnetic counterparts using high-resolution, cosmological simulations that include realistic clustering. We assume a near-future detector network (LVK + LIGO India in O5), with sky localization and distance uncertainty capabilities for …

us, gb, de, nl (code pays fourni par la source)

Not all those missing are lost: leveraging galaxy clustering in incomplete catalogs to unleash dark sirens cosmology

Riccardo Barbieri, Marios Kalomenopoulos, Matteo Tagliazucchi, Jonathan Gair et autres

Gravitational waves offer a unique opportunity to solve the Hubble tension. In order to do so, we have to extract as much information as possible from cross correlating gravitational wave events (used as "dark sirens") with incomplete galaxy catalogs. Traditional methods assume …

Supermassive black holes in six triaxial galaxies: Insights from SINFONI and MUSE observations

Sabine Thater, Avinash Chaturvedi, Davor Krajnović, Michele Cappellari et autres

Dynamical modelling can be used to constrain the masses of central black holes, but it is challenging to model massive galaxies because of their complex kinematics. We report six new measurements of supermassive black hole masses of massive early-type galaxies from stellar …

Impact of subhalo dynamical friction heating on the formation of the first structures in the Universe

Zhenyu Wu, Sadegh Khochfar, Muhammad A. Latif, Ben Morton et autres

ABSTRACT We present a model for gas heating, driven by dynamical friction from orbiting subhaloes within dark matter haloes. Using data from the TNG50 simulation, we derive the subhalo mass function and calculate the dynamical friction heating rate for a wide range …

gb, ae (code pays fourni par la source)

Supermassive black holes in six triaxial galaxies: Insights from SINFONI and MUSE observations

Sabine Thater, Avinash Chaturvedi, Davor Krajnović, Michele Cappellari et autres

Dynamical modelling can be used to constrain the masses of central black holes, but it is challenging to model massive galaxies because of their complex kinematics. We report six new measurements of supermassive black hole masses of massive early-type galaxies from stellar …

at, de, gb (code pays fourni par la source)

Supermassive black holes in six triaxial galaxies: Insights from SINFONI and MUSE observations

Sabine Thater, Avinash Chaturvedi, Davor Krajnovic, Michele Cappellari et autres

Dynamical modelling can be used to constrain the masses of central black holes; however, modelling massive galaxies is challenging due to their complexity. In this work, we report six new supermassive black hole mass measurements of massive early-type galaxies from stellar kinematics, …

Supermassive black holes in six triaxial galaxies: Insights from SINFONI and MUSE observations

Sabine Thater, Avinash Chaturvedi, Davor Krajnovic, Michele Cappellari et autres

Dynamical modelling can be used to constrain the masses of central black holes; however, modelling massive galaxies is challenging due to their complexity. In this work, we report six new supermassive black hole mass measurements of massive early-type galaxies from stellar kinematics, …

How Overmassive Black Holes Formed at Cosmic Dawn

Muhammad A. Latif, Daniel J. Whalen, Sadegh Khochfar, Fergus Cullen

Abstract Overmassive black hole galaxies (OBGs) at redshifts z ∼ 10, or 450 Myr after the Big Bang, are one of the most puzzling discoveries by the James Webb Space Telescope to date because they formed by such early epochs and their …

ae, gb (code pays fourni par la source)

Supplementary material for the publication: "Supermassive black holes in six triaxial galaxies: Insights from SINFONI and MUSE observations"

Sabine Thater, Avinash Chaturvedi, Davor Krajnovic, Michele Cappellari et autres

We provide here our supplementary materials (PDF) for our manuscript that is accepted in Astronomy & Astrophysics.

at, de, gb (code pays fourni par la source)

Supplementary material for the publication: "Supermassive black holes in six triaxial galaxies: Insights from SINFONI and MUSE observations"

Sabine Thater, Avinash Chaturvedi, Davor Krajnovic, Michele Cappellari et autres

We provide here our supplementary materials (PDF) for our manuscript that is accepted in Astronomy & Astrophysics.

at, de, gb (code pays fourni par la source)

How Overmassive Black Holes Formed at Cosmic Dawn

Muhammad A. Latif, Daniel J. Whalen, Sadegh Khochfar, Fergus Cullen

Overmassive black hole galaxies (OBGs) at redshifts $z \sim$ 10, or 450 Myr after the Big Bang, are one of the most puzzling discoveries by the James Webb Space Telescope to date because they formed by such early epochs and their black-hole …