Zobrazeno 1 - 10
of 1 196
pro vyhledávání: '"Regan, John"'
High redshift observations of 10$^9$ M$_\odot$ supermassive black holes (SMBHs) at $z \sim7$ and `Little Red Dots' that may host overmassive black holes at $z>4$ suggests the existence of so-called heavy seeds (>1000 M$_\odot$) in the early Universe.
Externí odkaz:
http://arxiv.org/abs/2410.06141
The advent of new and near-future observatories probing the earliest epochs of the Universe has opened the opportunity to investigate the formation and growth of the first massive black holes (MBHs). Additionally, the use of high resolution cosmologi
Externí odkaz:
http://arxiv.org/abs/2409.16413
Recent observations by the James Webb Space Telescope (JWST) have revealed a previously hidden population of extremely bright and compact objects between redshifts of $z \sim 4$ and $z \sim 10$. Given their extreme red colouring in the observed frame
Externí odkaz:
http://arxiv.org/abs/2409.13441
Recent observations by the James Webb Space Telescope confirm the existence of massive black holes ($>10^6$ $\rm{M_{\odot}}$) beyond the redshift of $z=10$. However, their formation mechanism(s) still remain an open question. Light seed black holes a
Externí odkaz:
http://arxiv.org/abs/2409.08326
Autor:
O'Brennan, Hannah, Regan, John A., Power, Chris, Ward, Saoirse, Brennan, John, McCaffrey, Joe
Publikováno v:
The Open Journal of Astrophysics, Vol. 7, 2024, 14th November
Recent JWST observations of very early galaxies, at $\rm{z \gtrsim 10}$, have led to claims that tension exists between the sizes and luminosities of high-redshift galaxies and what is predicted by standard $\Lambda$CDM models. Here we use the adapti
Externí odkaz:
http://arxiv.org/abs/2408.15194
Autor:
Regan, John, Volonteri, Marta
The pathway(s) to seeding the massive black holes (MBHs) that exist at the heart of galaxies in the present and distant Universe remains an unsolved problem. Here we categorise, describe and quantitatively discuss the formation pathways of both $\tex
Externí odkaz:
http://arxiv.org/abs/2405.17975
Autor:
Nandal, Devesh, Regan, John A., Woods, Tyrone E., Farrell, Eoin, Ekström, Sylvia, Meynet, Georges
The chemical enrichment of the early Universe is a crucial element in the formation and evolution of galaxies, and Population III (PopIII) stars must play a vital role in this process. In this study, we examine metal enrichment from massive stars in
Externí odkaz:
http://arxiv.org/abs/2402.03428
Publikováno v:
Monthly Notices of the Royal Astronomical Society, Volume 529, Issue 1, March 2024, Pages 604-627
We compare the performance of the popular Bondi-Hoyle-Lyttleton (BHL) accretion scheme with a simple mass-flux scheme applied to stellar-mass black holes (BHs) across six levels of increasing spatial resolution. Simulating the formation of black hole
Externí odkaz:
http://arxiv.org/abs/2401.04183
Publikováno v:
A&A 686, A256 (2024)
Observations of $z \gtrsim 6$ quasars provide information on the early evolution of the most massive black holes (MBHs) and galaxies. Current observations, able to trace both gas and stellar properties, reveal a population of MBHs that is significant
Externí odkaz:
http://arxiv.org/abs/2312.08422
Autor:
Prole, Lewis R., Regan, John A., Glover, Simon C. O., Klessen, Ralf S., Priestley, Felix D., Clark, Paul C.
Halos with masses in excess of the atomic limit are believed to be ideal environments in which to form heavy black hole seeds with masses above 10^3 Msun. In cases where the H_2 fraction is suppressed this is expected to lead to reduced fragmentation
Externí odkaz:
http://arxiv.org/abs/2312.06769