Projektbeschreibung
Evolution der Milchstraße durch detaillierte Informationen über Zwerggalaxien
In der Milchstraße sind wertvolle Informationen über die Formation und Evolution von Galaxien im Laufe der kosmischen Zeit verborgen. Diese Überreste können detailliert analysiert werden, um mehr über die ersten Sterne, die Anhäufung chemischer Elemente im Universum, dunkle Materie und die hierarchische Formation von Galaxien zu erfahren. Finanziert über den Europäischen Forschungsrat wird im Projekt TREASURES das wissenschaftliche Potenzial der umfangreichen Untersuchung 4DWARFS maximiert. Im Projekt sollen das stellare Alter, die Radialgeschwindigkeiten und Elementhäufigkeiten von über 130 000 Sternen bestimmt werden. Auch Informationen zu Zwerggalaxien und Strömen werden gesammelt, um das Wissen um mehrere Größenordnungen auszuweiten. Bei der 4DWARFS-Untersuchung werden hochwertige Spektren einzelner Sterne in fast 50 Zwerggalaxien und mehreren Sternströmen in Systemen, die grundlegende Veränderungen durchlaufen, erfasst.
Ziel
The Milky Way is an environment rich with satellite galaxies, stellar streams and accreted systems. Encoded in these structures is the formation and evolution of the Galaxy through cosmic time. Fortunately, these nearby relics can be studied in extraordinary detail – star by star – revealing the properties of the first stars, the build-up of chemical elements in the Universe, the nature of dark matter, and hierarchical galaxy formation.
To unlock these treasure troves of hidden information, I designed a large-scale survey: 4DWARFS (PI: Skúladóttir, 520,000 fibre hours) that after a very competitive 2-year selection has now been accepted as a 5-year 4MOST survey, starting in 2024. 4DWARFS will collect high-quality spectra of individual stars in close to 50 dwarf galaxies, and dozens of stellar streams from systems currently undergoing disruption.
The goal of TREASURES is to execute and exploit this large 4DWARFS survey to its highest scientific potential. TREASURES will provide the community with stellar ages, radial velocities and chemical abundances for over 130,000 stars, and thus increase the number of stars with detailed abundance information in dwarf galaxies and streams by several orders of magnitude, ensuring the far-reaching impact of this project. Furthermore, TREASURES will use state-of-the-art models to contrast these new large data against theory, and put in context with the Milky Way.
Through an ambitious combination of modelling and data of unprecedented magnitude and completeness TREASURES will quantify and put fundamental constraints on:
(I) The properties of the first stars (mass and energy distributions)
(II) The origin of the chemical elements (physics of stars, supernovae and neutron star mergers)
(III) Hierarchical galaxy formation at the smallest mass scales, and structure of dark matter halos
TREASURES will thus paint a comprehensive picture of the formation and evolution of the Milky Way environment, from cosmic dawn until the present day.
Wissenschaftliches Gebiet
- natural sciencesphysical sciencesastronomystellar astronomyneutron stars
- engineering and technologymechanical engineeringvehicle engineeringaerospace engineeringsatellite technology
- natural sciencesphysical sciencesastronomyastrophysicsdark matter
- natural sciencesphysical sciencesastronomyphysical cosmologygalaxy evolution
- natural sciencesphysical sciencesastronomystellar astronomysupernova
Schlüsselbegriffe
- Local group
- dwarf galaxies
- ultra faint dwarf galaxies
- dwarf spheroidal galaxies
- stellar streams
- accreted systems
- galaxy mergers
- dark matter
- chemical evolution
- chemical abundances
- nucleosynthesis
- first stars
- supernovae
- supernovae type Ia
- neutron star mergers
- asymptotic giant branch stars
- stellar physics
- stellar ages
- kinematics
- dynamics
- hierarchical galaxy formation
Programm/Programme
- HORIZON.1.1 - European Research Council (ERC) Main Programme
Thema/Themen
Finanzierungsplan
HORIZON-ERC - HORIZON ERC GrantsGastgebende Einrichtung
50121 Florence
Italien