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Concurrent formatio...
Concurrent formation of supermassive stars and globular clusters : Implications for early self-enrichment
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- Gieles, Mark (author)
- University of Surrey
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- Charbonnel, Corinne (author)
- University of Toulouse,University of Geneva
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- Krause, Martin G.H. (author)
- University of Hertfordshire
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- Hénault-Brunet, Vincent (author)
- Radboud University Nijmegen,National Research Council of Canada
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- Agertz, Oscar (author)
- Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science
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- Lamers, Henny J.G.L.M. (author)
- University of Amsterdam
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- Bastian, Nathan (author)
- Liverpool John Moores University
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- Gualandris, Alessia (author)
- University of Surrey
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- Zocchi, Alice (author)
- European Space Research and Technology Centre (ESA/ESTEC),University of Bologna
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- Petts, James A. (author)
- University of Surrey
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(creator_code:org_t)
- 2018
- 2018
- English 19 s.
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In: Monthly Notices of the Royal Astronomical Society. - 0035-8711. ; 478:2, s. 2461-2479
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http://dx.doi.org/10...
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Abstract
Subject headings
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- We present a model for the concurrent formation of globular clusters (GCs) and supermassive stars (SMSs, ≳103M⊙) to address the origin of the HeCNONaMgAl abundance anomalies in GCs. GCs form in converging gas flows and accumulate low-angular momentum gas, which accretes on to protostars. This leads to an adiabatic contraction of the cluster and an increase of the stellar collision rate. A SMS can form via runaway collisions if the cluster reaches sufficiently high density before two-body relaxation halts the contraction. This condition is met if the number of stars ≳106 and the gas accretion rate ≳105M⊙ Myr-1, reminiscent of GC formation in high gas-density environments, such as - but not restricted to - the early Universe. The strong SMS wind mixes with the inflowing pristine gas, such that the protostars accrete diluted hot-hydrogen burning yields of the SMS. Because of continuous rejuvenation, the amount of processed material liberated by the SMS can be an order of magnitude higher than its maximum mass. This 'conveyor-belt' production of hot-hydrogen burning products provides a solution to the mass budget problem that plagues other scenarios. Additionally, the liberated material is mildly enriched in helium and relatively rich in other hot-hydrogen burning products, in agreement with abundances of GCs today. Finally, we find a super-linear scaling between the amount of processed material and cluster mass, providing an explanation for the observed increase of the fraction of processed material with GC mass. We discuss open questions of this new GC enrichment scenario and propose observational tests.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- Galaxies: star clusters: general
- Globular clusters: general
- Stars: abundances
- Stars: black holes
- Stars: kinematics and dynamics
- Supergiants
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Gieles, Mark
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Charbonnel, Cori ...
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Krause, Martin G ...
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Hénault-Brunet, ...
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Agertz, Oscar
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Lamers, Henny J. ...
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Bastian, Nathan
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Gualandris, Ales ...
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Zocchi, Alice
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Petts, James A.
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- NATURAL SCIENCES
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NATURAL SCIENCES
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Lund University