Publications (17)
Descendants of the first stars: the distinct chemical signature of second generation stars
Tilman Hartwig, Naoki Yoshida, Mattis Magg +9
Extremely metal-poor (EMP) stars in the Milky Way (MW) allow us to infer the properties of their progenitors by comparing their chemical composition to the metal yields of the firs…
Predicting the locations of possible long-lived low-mass first stars: Importance of satellite dwarf galaxies
Mattis Magg, Tilman Hartwig, Bhaskar Agarwal +4
The search for metal-free stars has so far been unsuccessful, proving that if there are surviving stars from the first generation, they are rare, they have been polluted, or we hav…
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…
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…
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…
Metal Mixing in Minihalos: The Descendants of Pair-Instability Supernovae
Mattis Magg, Anna T. P. Schauer, Ralf S. Klessen +3
The lack of observations of abundance patterns originating in pair-instability supernovae has been a long-standing problem in relation to the first stars. This class of supernovae…
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…
A New Statistical Model for Population III Supernova Rates: Discriminating Between CDM and WDM Cosmologies
Mattis Magg, Tilman Hartwig, Simon C. O. Glover +2
With new observational facilities becoming available soon, discovering and characterising supernovae from the first stars will open up alternative observational windows to the end…
A Minimum Dilution Scenario for Supernovae and Consequences for Extremely Metal-Poor Stars
Mattis Magg, Thomas Nordlander, Simon C. O. Glover +6
To date no metal-free stars have been identified by direct observations. The most common method of constraining their properties is searching the spectra of the most metal-poor sta…
Effect of the cosmological transition to metal-enriched star-formation on the hydrogen 21-cm signal
Mattis Magg, Itamar Reis, Anastasia Fialkov +6
Mapping Cosmic Dawn with 21-cm tomography offers an exciting new window into the era of primordial star formation. However, self-consistent implementation of both the process of st…
Observational constraints on the survival of pristine stars
Mattis Magg, Ralf S. Klessen, Simon C. O. Glover +1
There is a longstanding discussion about whether low mass stars can form from pristine gas in the early Universe. A particular point of interest is whether we can find surviving pr…
Exploring the nature of the Lyman- emitter CR7
Tilman Hartwig, Muhammad A. Latif, Mattis Magg +6
CR7 is the brightest Lyman- emitter observed at , which shows very strong Lyman- and HeII 1640Ã line luminosities, but no metal line emission. Previous studies suggest…
Mono-enriched stars and Galactic chemical evolution -- Possible biases in observations and theory
Camilla Juul Hansen, Andreas Koch, Lyudmila Mashonkina +9
A long sought after goal using chemical abundance patterns derived from metal-poor stars is to understand the Galactic chemical evolution (GCE) and to pin down the nature of the fi…
Detecting strongly lensed supernovae at z ~ 5-7 with LSST
Claes-Erik Rydberg, Daniel J. Whalen, Matteo Maturi +4
Supernovae (SNe) could be powerful probes of the properties of stars and galaxies at high redshifts in future surveys. Wide fields and longer exposure times are required to offset…
Metal Mixing in the R-Process Enhanced Ultra-Faint Dwarf Galaxy Reticulum II
Alexander P. Ji, Joshua D. Simon, Ian U. Roederer +9
The ultra-faint dwarf galaxy Reticulum~II was enriched by a single rare and prolific r-process event. The r-process content of Reticulum~II thus provides a unique opportunity to st…
Gravitational Waves from the Remnants of the First Stars
Tilman Hartwig, Marta Volonteri, Volker Bromm +4
Gravitational waves (GWs) provide a revolutionary tool to investigate yet unobserved astrophysical objects. Especially the first stars, which are believed to be more massive than p…
A-SLOTH: Ancient Stars and Local Observables by Tracing Halos
Mattis Magg, Tilman Hartwig, Li-Hsin Chen +1
Galaxies are thought to reside inside of large gravitationally bound structures of dark matter, so-called haloes. While the smallest of these haloes host no or only a few stars, th…