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Title: Formation of globular cluster candidates in merging proto-galaxies at high redshift: a view from the FIRE cosmological simulations

Abstract

Using a state-of-the-art cosmological simulation of merging proto-galaxies at high redshift from the FIRE project, with explicit treatments of star formation and stellar feedback in the interstellar medium, we investigate the formation of star clusters and examine one of the formation hypotheses of present-day metal-poor globular clusters. Here, we find that frequent mergers in high-redshift proto-galaxies could provide a fertile environment to produce long-lasting bound star clusters. The violent merger event disturbs the gravitational potential and pushes a large gas mass of ≳ 10 5–6 M collectively to high density, at which point it rapidly turns into stars before stellar feedback can stop star formation. The high dynamic range of the reported simulation is critical in realizing such dense star-forming clouds with a small dynamical time-scale, tff ≲ 3 Myr, shorter than most stellar feedback time-scales. Our simulation then allows us to trace how clusters could become virialized and tightly bound to survive for up to ~420 Myr till the end of the simulation. Finally, because the cluster's tightly bound core was formed in one short burst, and the nearby older stars originally grouped with the cluster tend to be preferentially removed, at the end of the simulation themore » cluster has a small age spread.« less

Authors:
ORCiD logo [1]; ORCiD logo [2];  [2]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4];  [5];  [6]; ORCiD logo [2];  [7]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States). Kavli Inst. for Particle Astrophysics and Cosmology; Stanford Univ., CA (United States). Dept. of Physics; California Inst. of Technology (CalTech), Pasadena, CA (United States). TAPIR, Dept. of Astronomy
  2. California Inst. of Technology (CalTech), Pasadena, CA (United States). TAPIR, Dept. of Astronomy
  3. Center for Computational Astrophysics, New York, NY (United States). Flatiron Inst.; Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
  4. California Inst. of Technology (CalTech), Pasadena, CA (United States). TAPIR, Dept. of Astronomy; Carnegie Observatories, Pasadena, CA (United States); Univ. of California, Davis, CA (United States). Dept. of Physics
  5. Northwestern Univ., Evanston, IL (United States). Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA), Dept. of Physics and Astronomy
  6. Univ. of California, San Diego, CA (United States). Center for Astrophysics and Space Sciences, Dept. of Physics
  7. Univ. of Toronto, ON (Canada). Canadian Inst. for Theoretical Astrophysics
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE; National Science Foundation (NSF); National Aeronautic and Space Administration (NASA); Alfred P. Sloan Foundation; Gordon and Betty Moore Foundation
OSTI Identifier:
1423127
Grant/Contract Number:  
AC02-76SF00515; PF4-150147; NAS8-03060; AST-1411920; AST-1517491; AST-1412836; 1455342; NNX14AH35G; HSTGO-14734; NNX15AB22G; HST-AR-14293.001-A; HST-GO-14268.022-A; PF5-160136
Resource Type:
Accepted Manuscript
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 474; Journal Issue: 3; Journal ID: ISSN 0035-8711
Publisher:
Royal Astronomical Society
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; stars formation; globular clusters general; galaxies formation; galaxies kinematics and dynamics; galaxies star clusters general; cosmology theory

Citation Formats

Kim, Ji-hoon, Ma, Xiangcheng, Grudić, Michael Y., Hopkins, Philip F., Hayward, Christopher C., Wetzel, Andrew, Faucher-Giguère, Claude-André, Kereš, Dušan, Garrison-Kimmel, Shea, and Murray, Norman. Formation of globular cluster candidates in merging proto-galaxies at high redshift: a view from the FIRE cosmological simulations. United States: N. p., 2017. Web. doi:10.1093/mnras/stx2994.
Kim, Ji-hoon, Ma, Xiangcheng, Grudić, Michael Y., Hopkins, Philip F., Hayward, Christopher C., Wetzel, Andrew, Faucher-Giguère, Claude-André, Kereš, Dušan, Garrison-Kimmel, Shea, & Murray, Norman. Formation of globular cluster candidates in merging proto-galaxies at high redshift: a view from the FIRE cosmological simulations. United States. doi:10.1093/mnras/stx2994.
Kim, Ji-hoon, Ma, Xiangcheng, Grudić, Michael Y., Hopkins, Philip F., Hayward, Christopher C., Wetzel, Andrew, Faucher-Giguère, Claude-André, Kereš, Dušan, Garrison-Kimmel, Shea, and Murray, Norman. Thu . "Formation of globular cluster candidates in merging proto-galaxies at high redshift: a view from the FIRE cosmological simulations". United States. doi:10.1093/mnras/stx2994. https://www.osti.gov/servlets/purl/1423127.
@article{osti_1423127,
title = {Formation of globular cluster candidates in merging proto-galaxies at high redshift: a view from the FIRE cosmological simulations},
author = {Kim, Ji-hoon and Ma, Xiangcheng and Grudić, Michael Y. and Hopkins, Philip F. and Hayward, Christopher C. and Wetzel, Andrew and Faucher-Giguère, Claude-André and Kereš, Dušan and Garrison-Kimmel, Shea and Murray, Norman},
abstractNote = {Using a state-of-the-art cosmological simulation of merging proto-galaxies at high redshift from the FIRE project, with explicit treatments of star formation and stellar feedback in the interstellar medium, we investigate the formation of star clusters and examine one of the formation hypotheses of present-day metal-poor globular clusters. Here, we find that frequent mergers in high-redshift proto-galaxies could provide a fertile environment to produce long-lasting bound star clusters. The violent merger event disturbs the gravitational potential and pushes a large gas mass of ≳ 105–6 M⊙ collectively to high density, at which point it rapidly turns into stars before stellar feedback can stop star formation. The high dynamic range of the reported simulation is critical in realizing such dense star-forming clouds with a small dynamical time-scale, tff ≲ 3 Myr, shorter than most stellar feedback time-scales. Our simulation then allows us to trace how clusters could become virialized and tightly bound to survive for up to ~420 Myr till the end of the simulation. Finally, because the cluster's tightly bound core was formed in one short burst, and the nearby older stars originally grouped with the cluster tend to be preferentially removed, at the end of the simulation the cluster has a small age spread.},
doi = {10.1093/mnras/stx2994},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 3,
volume = 474,
place = {United States},
year = {2017},
month = {11}
}

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