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Journal article
Evolution of star clusters in a cosmological tidal field
Monthly notices of the Royal Astronomical Society, v 436(4), pp 3695-3706
01 Dec 2013
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Abstract
We present a method to couple N-body star cluster simulations to a cosmological tidal field, using amuse (Astrophysical Multipurpose Software Environment). We apply this method to star clusters embedded in the CosmoGrid dark matter only Lambda cold dark matter simulation. Our star clusters are born at z = 10 (corresponding to an age of the universe of about 500 Myr) by selecting a dark matter particle and initializing a star cluster with 32 000 stars on its location. We then follow the dynamical evolution of the star cluster within the cosmological environment. We compare the evolution of star clusters in two Milky Way size haloes with a different accretion history. The mass-loss of the star clusters is continuous irrespective of the tidal history of the host halo, but major merger events tend to increase the rate of mass-loss. From the selected two dark matter haloes, the halo that experienced the larger number of mergers tends to drive a smaller mass-loss rate from the embedded star clusters, even though the final masses of both haloes are similar. We identify two families of star clusters: native clusters, which become part of the main halo before its final major merger event, and the immigrant clusters, which are accreted upon or after this event; native clusters tend to evaporate more quickly than immigrant clusters. Accounting for the evolution of the dark matter halo causes immigrant star clusters to retain more mass than when the z = 0 tidal field is taken as a static potential. The reason for this is the weaker tidal field experienced by immigrant star clusters before merging with the larger dark matter halo.
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Details
- Title
- Evolution of star clusters in a cosmological tidal field
- Creators
- Steven Rieder - Leiden UniversityTomoaki Ishiyama - University of TsukubaPaul Langelaan - Leiden UniversityJunichiro Makino - Tokyo Institute of TechnologyStephen L. W. McMillan - Drexel UniversitySimon Portegies Zwart - Leiden Univ, Sterrewacht Leiden, POB 9513, NL-2300 RA Leiden, Netherlands
- Publication Details
- Monthly notices of the Royal Astronomical Society, v 436(4), pp 3695-3706
- Publisher
- Oxford Univ Press
- Number of pages
- 12
- Grant note
- 643.000.803 / NWO; Netherlands Organization for Scientific Research (NWO) 612.071.503 / LGM AST-0708299 / NSF in the USA NOVA SH-095-08; SH-187-10 / NCF 24740115 / MEXT/JSPS KAKENHI; Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT); Japan Society for the Promotion of Science; Grants-in-Aid for Scientific Research (KAKENHI) 614.061.608 / AMUSE LKBF in the Netherlands; Netherlands Government MEXT HPCI STRATEGIC PROGRAM RI-031513; RI-222919 / DEISA Consortium (EU) 639.073.803 / VICI; Netherlands Organization for Scientific Research (NWO)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000327798100063
- Scopus ID
- 2-s2.0-84889047018
- Other Identifier
- 991019167570504721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Astronomy & Astrophysics