193 citations · 1.7k across the 44 of their papers we have counts for
35 papers · 1 filter
Impact of initial mass function on the chemical evolution of high-redshift galaxies
Boyuan Liu, Michela Mapelli, Volker Bromm +10
Recent observations by the James Webb Space Telescope (JWST) have found evidence for an invariant relation between stellar mass, metallicity, and star formation rate up to $z\sim 8…
A-SLOTH reveals the nature of the first stars
Tilman Hartwig, Veronika Lipatova, Simon C. O. Glover +1
The first generation of stars (PopIII) are too dim to be observed directly and probably too short-lived to have survived for local observations. Hence, we rely on simulations and i…
Gravitational waves from mergers of Population III binary black holes: roles played by two evolution channels
Boyuan Liu, Tilman Hartwig, Nina S. Sartorio +6
The gravitational wave (GW) signal from binary black hole (BBH) mergers is a promising probe of Population III (Pop III) stars. To fully unleash the power of the GW probe, one impo…
Binary black hole mergers from Population III stars: uncertainties from star formation and binary star properties
Filippo Santoliquido, Michela Mapelli, Giuliano Iorio +5
Population III (Pop. III) binary stars likely produced the first stellar-born binary black hole (BBH) mergers in the Universe. Here, we quantify the main sources of uncertainty for…
Machine learning detects multiplicity of the first stars in stellar archaeology data
Tilman Hartwig, Miho N. Ishigaki, Chiaki Kobayashi +2
In unveiling the nature of the first stars, the main astronomical clue is the elemental compositions of the second generation of stars, observed as extremely metal-poor (EMP) stars…
First estimate of the local value of the baryonic streaming velocity
Betul Uysal, Tilman Hartwig
Several studies have shown the influence of the relative streaming velocity (SV) between baryons and dark matter on the formation of structures. For the first time, we constrain th…
A machine learning approach to assessing the presence of substructure in quasar host galaxies using the Hyper Suprime-Cam Subaru Strategic Program
Chris Nagele, John D. Silverman, Tilman Hartwig +4
The conditions under which galactic nuclear regions become active are largely unknown, although it has been hypothesized that secular processes related to galaxy morphology could p…
Unveiling the contribution of Pop III stars in primeval galaxies at redshift
Shafqat Riaz, Tilman Hartwig, Muhammad A. Latif
Detection of the first stars has remained elusive so-far but their presence may soon be unveiled by upcoming JWST observations. Previous studies have not investigated the entire po…
Comparing simulated Milky Way satellite galaxies with observations using unsupervised clustering
Li-Hsin Chen, Tilman Hartwig, Ralf S. Klessen +1
We develop a new analysis method that allows us to compare multi-dimensional observables to a theoretical model. The method is based on unsupervised clustering algorithms which ass…
Public Release of A-SLOTH: Ancient Stars and Local Observables by Tracing Halos
Tilman Hartwig, Mattis Magg, Li-Hsin Chen +8
The semi-analytical model A-SLOTH (Ancient Stars and Local Observables by Tracing Halos) is the first public code that connects the formation of the first stars and galaxies to obs…
Tracing stars in Milky Way satellites with A-SLOTH
Li-Hsin Chen, Mattis Magg, Tilman Hartwig +3
We study the stellar mass-to-halo mass relation at in 30 Milky Way-like systems down to the ultra-faint () regime using the semi-analytic model A-SLOTH. A…
Gravitational waves from the remnants of the first stars in nuclear star clusters
Boyuan Liu, Volker Bromm
We study Population III (Pop III) binary remnant mergers in nuclear star clusters (NSCs) with a semi-analytical approach for early structure formation. Within this framework, we ke…
Origin of metals in old Milky Way halo stars based on GALAH and Gaia
Miho N. Ishigaki, Tilman Hartwig, Yuta Tarumi +6
Stellar and supernova nucleosynthesis in the first few billion years of the cosmic history have set the scene for early structure formation in the Universe, while little is known a…
Optical Spectroscopy of Dual Quasar Candidates from the Subaru HSC-SSP program
Shenli Tang, John D. Silverman, Xuheng Ding +30
We report on a spectroscopic program to search for dual quasars using Subaru Hyper Suprime-Cam (HSC) images of SDSS quasars which represent an important stage during galaxy mergers…
Dual supermassive black holes at close separation revealed by the Hyper Suprime-Cam Subaru Strategic Program
John D. Silverman, Shenli Tang, Khee-Gan Lee +30
The unique combination of superb spatial resolution, wide-area coverage, and deep depth of the optical imaging from the Hyper Suprime-Cam (HSC) Subaru Strategic Program is utilized…
Implications of inhomogeneous metal mixing for stellar archaeology
Yuta Tarumi, Tilman Hartwig, Mattis Magg
The first supernovae enrich the previously pristine gas with metals, out of which the next generation of stars form. Based on hydrodynamical simulations, we develop a new stochasti…
Radio Power from a Direct-Collapse Black Hole in CR7
Daniel J. Whalen, Mar Mezcua, Avery Meiksin +2
The leading contenders for the seeds of the first quasars are direct collapse black holes (DCBHs) formed during catastrophic baryon collapse in atomically-cooled halos at …
On the Detection of Supermassive Primordial Stars. II. Blue Supergiants
Marco Surace, Erik Zackrisson, Daniel J. Whalen +4
Supermassive primordial stars in hot, atomically-cooling haloes at 15 - 20 may have given birth to the first quasars in the universe. Most simulations of these rapidly acc…
Formation of carbon-enhanced metal-poor stars as a consequence of inhomogeneous metal mixing
Tilman Hartwig, Naoki Yoshida
We present a novel scenario for the formation of carbon-enhanced metal-poor (CEMP) stars. Carbon enhancement at low stellar metallicities is usually considered a consequence of fai…
On the Detection of Supermassive Primordial Stars
Marco Surace, Daniel J. Whalen, Tilman Hartwig +6
The collapse of supermassive primordial stars in hot, atomically-cooled halos may have given birth to the first quasars at 15 - 20. Recent numerical simulations of these r…
Fingerprint of the first stars: multi-enriched extremely metal-poor stars in the TOPoS survey
Tilman Hartwig, Miho N. Ishigaki, Ralf S. Klessen +1
Extremely metal poor (EMP) stars in the Milky Way inherited the chemical composition of the gas out of which they formed. They therefore carry the chemical fingerprint of the first…
Titans of the Early Universe: The Prato Statement on the Origin of the First Supermassive Black Holes
Tyrone E. Woods, Bhaskar Agarwal, Volker Bromm +30
In recent years, the discovery of massive quasars at z~7 has provided a striking challenge to our understanding of the origin and growth of supermassive black holes in the early Un…
Statistical predictions for the first black holes
Tilman Hartwig
The recent observations of supermassive black holes (SMBHs) at high redshift challenge our understanding of their formation and growth. There are different proposed pathways to for…
Gravitational Wave Signals from the First Massive Black Hole Seeds
Tilman Hartwig, Bhaskar Agarwal, John A. Regan
Recent numerical simulations reveal that the isothermal collapse of pristine gas in atomic cooling haloes may result in stellar binaries of supermassive stars with $M_* \gtrsim 10^…