Universität zu Köln

Lahen, Natalia ORCID: 0000-0003-2166-1935, Naab, Thorsten, Johansson, Peter H., Elmegreen, Bruce, Hu, Chia-Yu ORCID: 0000-0002-9235-3529, Walch, Stefanie ORCID: 0000-0001-6941-7638, Steinwandel, Ulrich P. and Moster, Benjamin P. (2020). The GRIFFIN Project-Formation of Star Clusters with Individual Massive Stars in a Simulated Dwarf Galaxy Starburst. Astrophys. J., 891 (1). BRISTOL: IOP PUBLISHING LTD. ISSN 1538-4357

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Abstract

We describe a population of young star clusters (SCs) formed in a hydrodynamical simulation of a gas-rich dwarf galaxy merger resolved with individual massive stars at subparsec spatial resolution. The simulation is part of the GRIFFIN (Galaxy Realizations Including Feedback From INdividual massive stars) project. The star formation environment during the simulation spans seven orders of magnitude in gas surface density and thermal pressure, and the global star formation rate surface density (Sigma(SFR)) varies by more than three orders of magnitude during the simulation. Young SCs more massive than M-*,M-cl similar to 10(2.5)M(circle dot) form along a mass function with a power-law index alpha similar to -1.7 (alpha similar to -2 for M-*,M-cl greater than or similar to 10(3) M-circle dot) at all merger phases, while the normalization and the highest SC masses (up to similar to 10(6) M-circle dot) correlate with SSFR. The cluster formation efficiency varies from Gamma similar to 20% in early merger phases to Gamma similar to 80% at the peak of the starburst and is compared to observations and model predictions. The massive SCs (greater than or similar to 10(4)M(circle dot)) have sizes and mean surface densities similar to observed young massive SCs. Simulated lower mass clusters appear slightly more concentrated than observed. All SCs form on timescales of a few Myr and lose their gas rapidly resulting in typical stellar age spreads between sigma similar to 0.1-2 Myr (1 sigma), consistent with observations. The age spreads increase with cluster mass, with the most massive cluster (similar to 10(6)M(circle dot)) reaching a spread of 5 Myr once its hierarchical formation finishes. Our study shows that it is now feasible to investigate the SC population of entire galaxies with novel high-resolution numerical simulations.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Lahen, Natalia UNSPECIFIED orcid.org/0000-0003-2166-1935 UNSPECIFIED Naab, Thorsten UNSPECIFIED UNSPECIFIED UNSPECIFIED Johansson, Peter H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Elmegreen, Bruce UNSPECIFIED UNSPECIFIED UNSPECIFIED Hu, Chia-Yu UNSPECIFIED orcid.org/0000-0002-9235-3529 UNSPECIFIED Walch, Stefanie UNSPECIFIED orcid.org/0000-0001-6941-7638 UNSPECIFIED Steinwandel, Ulrich P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Moster, Benjamin P. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-341938
DOI:	10.3847/1538-4357/ab7190
Journal or Publication Title:	Astrophys. J.
Volume:	891
Number:	1
Date:	2020
Publisher:	IOP PUBLISHING LTD
Place of Publication:	BRISTOL
ISSN:	1538-4357
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SMOOTHED PARTICLE HYDRODYNAMICS; STANDARD STELLAR LIBRARY; GIANT MOLECULAR CLOUDS; SUPERNOVA-DRIVEN ISM; HIGH-REDSHIFT; EVOLUTIONARY SYNTHESIS; GLOBULAR-CLUSTERS; DYNAMICAL EVOLUTION; BRIGHTNESS PROFILES; INTERSTELLAR-MEDIUM Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/34193