Universität zu Köln

Lahen, Natalia ORCID: 0000-0003-2166-1935, Naab, Thorsten ORCID: 0000-0002-7314-2558, Johansson, Peter H., Elmegreen, Bruce, Hu, Chia-Yu ORCID: 0000-0002-9235-3529 and Walch, Stefanie ORCID: 0000-0001-6941-7638 (2019). The Formation of Low-metallicity Globular Clusters in Dwarf Galaxy Mergers. Astrophys. J. Lett., 879 (2). BRISTOL: IOP PUBLISHING LTD. ISSN 2041-8213

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Abstract

We present a hydrodynamical simulation at sub-parsec and few-solar-mass resolution of a merger between two gas-rich dwarf galaxies. Our simulation includes a detailed model for the multi-phase interstellar medium and is able to follow the entire formation history of spatially resolved star clusters, including feedback from individual massive stars. Shortly after the merger we find a population of similar to 900 stellar clusters with masses above 10(2.5) M-circle dot and a cluster mass function (CMF), which is well fitted with a power law with a slope of alpha = -1.70 +/- 0.08. We describe here in detail the formation of the three most massive clusters (M-* greater than or similar to 10(5) M-circle dot), which populate the high-mass end of the CMF. The simulated clusters form rapidly on a timescale of 6-8 Myr in converging flows of dense gas. The embedded merger phase has extremely high star formation rate surface densities of Sigma(SFR) > 10 M-circle dot yr(-1) kpc(-2) and thermal gas pressures in excess of Pth similar to 10(7) K-B cm(-3))(-1). The formation process is terminated by rapid gas expulsion driven by the first generation of supernovae, after which the cluster centers relax and both their structure and kinematics become indistinguishable from observed local globular clusters (GCs). The simulation presented here provides a general model for the formation of metal-poor GCs in chemically unevolved starbursting environments of low-mass dwarf galaxies, which are common at high redshifts.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Lahen, Natalia UNSPECIFIED orcid.org/0000-0003-2166-1935 UNSPECIFIED Naab, Thorsten UNSPECIFIED orcid.org/0000-0002-7314-2558 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
URN:	urn:nbn:de:hbz:38-135261
DOI:	10.3847/2041-8213/ab2a13
Journal or Publication Title:	Astrophys. J. Lett.
Volume:	879
Number:	2
Date:	2019
Publisher:	IOP PUBLISHING LTD
Place of Publication:	BRISTOL
ISSN:	2041-8213
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SMOOTHED PARTICLE HYDRODYNAMICS; MASSIVE STAR-CLUSTERS; BRIGHTNESS PROFILES; FEEDBACK; SIMULATIONS; CLOUDS; YIELDS Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/13526