FORMATION OF COMPACT STELLAR CLUSTERS BY HIGH-REDSHIFT GALAXY OUTFLOWS. I. NON-EQUILIBRIUM COOLANT FORMATION

Gray, William J; Scannapieco, Evan

doi:10.1088/0004-637X/718/1/417

Title: FORMATION OF COMPACT STELLAR CLUSTERS BY HIGH-REDSHIFT GALAXY OUTFLOWS. I. NON-EQUILIBRIUM COOLANT FORMATION

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Abstract

We use high-resolution three-dimensional adaptive mesh refinement simulations to investigate the interaction of high-redshift galaxy outflows with low-mass virialized clouds of primordial composition. While atomic cooling allows star formation in objects with virial temperatures above 10{sup 4} K, 'minihalos' below this threshold are generally unable to form stars by themselves. However, these objects are highly susceptible to triggered star formation, induced by outflows from neighboring high-redshift starburst galaxies. Here, we conduct a study of these interactions, focusing on cooling through non-equilibrium molecular hydrogen (H{sub 2}) and hydrogen deuteride (HD) formation. Tracking the non-equilibrium chemistry and cooling of 14 species and including the presence of a dissociating background, we show that shock interactions can transform minihalos into extremely compact clusters of coeval stars. Furthermore, these clusters are all less than {approx}10{sup 6} M {sub sun}, and they are ejected from their parent dark matter halos: properties that are remarkably similar to those of the old population of globular clusters.

Authors:

Gray, William J; Scannapieco, Evan ^[1]

School of Earth and Space Exploration, Arizona State University, P.O. Box 871404, Tempe, AZ 85287-1404 (United States)

Publication Date:: Tue Jul 20 00:00:00 EDT 2010

OSTI Identifier:: 21455146

Resource Type:: Journal Article

Journal Name:: Astrophysical Journal

Additional Journal Information:: Journal Volume: 718; Journal Issue: 1; Other Information: DOI: 10.1088/0004-637X/718/1/417; Journal ID: ISSN 0004-637X

Country of Publication:: United States

Language:: English

Subject:: 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; GALACTIC EVOLUTION; GALAXIES; HYDROGEN; HYDROGEN DEUTERIDE; NONLUMINOUS MATTER; RED SHIFT; SHOCK WAVES; SIMULATION; STAR CLUSTERS; STARS; THREE-DIMENSIONAL CALCULATIONS; DEUTERIDES; DEUTERIUM COMPOUNDS; ELEMENTS; EVOLUTION; HYDROGEN COMPOUNDS; MATTER; NONMETALS

Citation Formats


                    Gray, William J, and Scannapieco, Evan. FORMATION OF COMPACT STELLAR CLUSTERS BY HIGH-REDSHIFT GALAXY OUTFLOWS. I. NON-EQUILIBRIUM COOLANT FORMATION.  United States: N. p., 2010. 
        Web.  doi:10.1088/0004-637X/718/1/417.

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                    Gray, William J, & Scannapieco, Evan. FORMATION OF COMPACT STELLAR CLUSTERS BY HIGH-REDSHIFT GALAXY OUTFLOWS. I. NON-EQUILIBRIUM COOLANT FORMATION.  United States.  https://doi.org/10.1088/0004-637X/718/1/417

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                    Gray, William J, and Scannapieco, Evan. 2010.  
        "FORMATION OF COMPACT STELLAR CLUSTERS BY HIGH-REDSHIFT GALAXY OUTFLOWS. I. NON-EQUILIBRIUM COOLANT FORMATION".  United States.  https://doi.org/10.1088/0004-637X/718/1/417.

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@article{osti_21455146,

  title        = {FORMATION OF COMPACT STELLAR CLUSTERS BY HIGH-REDSHIFT GALAXY OUTFLOWS. I. NON-EQUILIBRIUM COOLANT FORMATION},

  author       = {Gray, William J and Scannapieco, Evan},

  abstractNote = {We use high-resolution three-dimensional adaptive mesh refinement simulations to investigate the interaction of high-redshift galaxy outflows with low-mass virialized clouds of primordial composition. While atomic cooling allows star formation in objects with virial temperatures above 10{sup 4} K, 'minihalos' below this threshold are generally unable to form stars by themselves. However, these objects are highly susceptible to triggered star formation, induced by outflows from neighboring high-redshift starburst galaxies. Here, we conduct a study of these interactions, focusing on cooling through non-equilibrium molecular hydrogen (H{sub 2}) and hydrogen deuteride (HD) formation. Tracking the non-equilibrium chemistry and cooling of 14 species and including the presence of a dissociating background, we show that shock interactions can transform minihalos into extremely compact clusters of coeval stars. Furthermore, these clusters are all less than {approx}10{sup 6} M {sub sun}, and they are ejected from their parent dark matter halos: properties that are remarkably similar to those of the old population of globular clusters.},

  doi          = {10.1088/0004-637X/718/1/417},

  url          = {https://www.osti.gov/biblio/21455146},
  journal      = {Astrophysical Journal},

  issn         = {0004-637X},

  number       = 1,

  volume       = 718,

  place        = {United States},

  year         = {Tue Jul 20 00:00:00 EDT 2010},

  month        = {Tue Jul 20 00:00:00 EDT 2010}

}

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