79 citations · 820 across the 41 of their papers we have counts for
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Supermassive stars with embedded stellar black hole cores: dense assembling star clusters as faint multiple Little Red Dot systems
Antti Rantala
Numerical simulations have established that star clusters with densities comparable to the high redshift (-) James Webb Space Telescope (JWST) proto globular clusters may…
FROST-CLUSTERS -- III. Metallicity-dependent intermediate mass black hole formation by runaway collisions in dense star clusters
Antti Rantala, Thorsten Naab, Natalia Lahén +4
We explore the formation of intermediate mass black holes (IMBHs), potential seeds for supermassive black holes (SMBHs), via runaway stellar collisions for a wide range of star clu…
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_{\…
Elusive Plunges and Heavy Intermediate-mass-ratio Inspirals from Single and Binary Supermassive Black Holes
Lazaros Souvaitzis, Antti Rantala, Thorsten Naab
The most massive galaxies in the Universe also host the largest supermassive black holes (SMBHs), with masses of and above. During their hierarchical a…
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…
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…
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…
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…
The role of Massive Black Holes in merging star clusters: dynamical evolution, stellar & compact object ejections and gravitational waves
Lazaros Souvaitzis, Antti Rantala, Thorsten Naab
Star clusters can interact and merge in galactic discs, halos, or centers. We present direct N-body simulations of binary mergers of star clusters with $M_{\star} = 2.7 \times 10^4…
A rapid channel for the collisional formation and gravitational wave driven mergers of supermassive black hole seeds at high redshift
Antti Rantala, Thorsten Naab
Motivated by JWST observations of dense, clumpy and clustered high redshift star formation, we simulate the hierarchical assembly of nine star cluste…
MAGICS II. Seed black holes stripped of their surrounding stars do not sink
Yihao Zhou, Diptajyoti Mukherjee, Nianyi Chen +7
MBH seed mergers are expected to be among the loudest sources of gravitational waves detected by the Laser Interferometer Space Antenna (LISA), providing a unique window into the b…
Identifying supermassive black hole recoil in elliptical galaxies
Alexander Rawlings, Atte Keitaanranta, Max Mattero +8
We study stellar core growth in simulations of merging massive () elliptical galaxies by a supermassive black hole (SMBH) displaced by gravitatio…
The formation, evolution and disruption of star clusters with improved gravitational dynamics in simulated dwarf galaxies
Natalia Lahén, Antti Rantala, Thorsten Naab +3
So far, even the highest resolution galaxy formation simulations with gravitational softening have failed to reproduce realistic life cycles of star clusters. We present the first…
The importance of nuclear star clusters for massive black hole growth and nuclear star formation in simulated low-mass galaxies
Christian Partmann, Thorsten Naab, Natalia Lahén +5
Observed low-mass galaxies with nuclear star clusters (NSCs) can host accreting massive black holes (MBH). We present simulations of dwarf galaxies ($M_{\mathrm{baryon}} \sim 0.6 -…
The supermassive black hole merger driven evolution of high-redshift red nuggets into present-day cored early-type galaxies
Antti Rantala, Alexander Rawlings, Thorsten Naab +2
Very compact ( kpc) massive quiescent galaxies (red nuggets) are more abundant in the high-redshift Universe (-) than today. Their size evolution…
Close Encounters of Wide Binaries Induced by the Galactic Tide: Implications for Stellar Mergers and Gravitational-Wave Sources
Jakob Stegmann, Alejandro Vigna-Gómez, Antti Rantala +6
A substantial fraction of stars can be found in wide binaries with projected separations between and . In the standard lore of binary physics, these would…
A calibrated model for N-body dynamical friction acting on supermassive black holes
Anna Genina, Volker Springel, Antti Rantala
Black holes are believed to be crucial in regulating star formation in massive galaxies, which makes it essential to faithfully represent the physics of these objects in cosmologic…
FROST-CLUSTERS -- I. Hierarchical star cluster assembly boosts intermediate-mass black hole formation
Antti Rantala, Thorsten Naab, Natalia Lahén
Observations and high-resolution hydrodynamical simulations indicate that massive star clusters assemble hierarchically from sub-clusters with a universal power-law cluster mass fu…
The difficult path to coalescence: massive black hole dynamics in merging low mass dark matter haloes and galaxies
Christian Partmann, Thorsten Naab, Antti Rantala +3
We present a high resolution numerical study of the sinking and merging of massive black holes (MBHs) with masses in the range of in multiple mino…
Evolution of eccentric stellar disks around supermassive black holes: the complex disk disruption dynamics and the milliparsec stars
Antti Rantala, Thorsten Naab
We study the 10 Myr evolution of parsec-scale stellar disks with initial masses of - and eccentricities -$0…
The isotropic center of NGC 5419 -- A core in formation?
Bianca Neureiter, Jens Thomas, Antti Rantala +5
With its cored surface brightness profile, the elliptical galaxy NGC 5419 appears as a typical high-mass early-type galaxy (ETG). However, the galaxy hosts two distinct nuclei in i…
Accuracy and precision of triaxial orbit models I: SMBH mass, stellar mass and dark-matter halo
B. Neureiter, S. de Nicola, J. Thomas +3
We investigate the accuracy and precision of triaxial dynamical orbit models by fitting two dimensional mock observations of a realistic N-body merger simulation resembling a massi…
The growth of intermediate mass black holes through tidal captures and tidal disruption events
Francesco Paolo Rizzuto, Thorsten Naab, Antti Rantala +5
We present simulations, including post-Newtonian dynamics, of dense clusters of low-mass stars harbouring central black holes (BHs) with initial masses of 50, 30…
Formation of star clusters and enrichment by massive stars in simulations of low-metallicity galaxies with a fully sampled initial stellar mass function
Natalia Lahén, Thorsten Naab, Guinevere Kauffmann +6
We present new GRIFFIN project hydrodynamical simulations that model the formation of galactic star cluster populations in low-metallicity () dwarf galaxies, including r…