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most citedSupermassive stars with embedded stellar black hole cores: dense assembling star clusters as faint multiple Little Red Dot systems

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astro-ph.GA2025

Rapid sinking and efficient mergers of supermassive black holes in compact high-redshift galaxies

Atte Keitaanranta, Peter H. Johansson, Alexander Rawlings +5

We present a cosmological zoom-in simulation targeting the high redshift compact progenitor phase of massive galaxies, with the most massive galaxy reaching a stellar mass of $M_{\…

astro-ph.GA2025

Caught in the act: detections of recoiling supermassive black holes from simulations

Alexander Rawlings, Peter H. Johansson, Thorsten Naab +3

We study the detectability of supermassive black holes (SMBHs) with masses of displaced by gravitational wave recoil kicks $(v_{\rm ki…

astro-ph.GA2025

Mergers all the way down: stellar collisions and kinematics of a dense hierarchically forming massive star cluster in a dwarf starburst

Natalia Lahén, Thorsten Naab, Antti Rantala +1

Recent observations indicate that the progenitors of globular clusters (GCs) at high redshifts had high average stellar surface densities above $10^5\, \mathrm{M}_\odot\, \mathrm{p…

astro-ph.GA2025

FROST-CLUSTERS -- II. Massive stars, binaries and triples boost supermassive black hole seed formation in assembling star clusters

Antti Rantala, Natalia Lahén, Thorsten Naab +2

Observations and high-resolution hydrodynamical simulations indicate that massive star clusters form through a complex hierarchical assembly. We use simulations including post-Newt…

astro-ph.GA2025

A rapid channel for the collisional formation and gravitational wave driven mergers of supermassive black hole seeds at high redshift

Antti Rantala, Thorsten Naab

Motivated by JWST observations of dense, clumpy and clustered high redshift star formation, we simulate the hierarchical assembly of nine star cluste…

astro-ph.GA2025

Massive Interacting Binaries Enhance Feedback in Star-Forming Regions

Claude Cournoyer-Cloutier, Eric P. Andersson, Sabrina M. Appel +9

We present a new framework to incorporate feedback from massive interacting binaries in simulations of star cluster formation. Our new feedback model adds binary stellar evolution…