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Title: EFFECT OF STREAMING MOTION OF BARYONS RELATIVE TO DARK MATTER ON THE FORMATION OF THE FIRST STARS

Abstract

We evaluate the effect of a supersonic relative velocity between the baryons and dark matter on the thermal and density evolution of the first gas clouds at z {approx}< 50. Through a series of cosmological simulations, initialized at z{sub i} = 100 with a range of relative streaming velocities and minihalo formation redshifts, we find that the typical streaming velocities will have little effect on the gas evolution. Once the collapse begins, the subsequent evolution of the gas will be nearly indistinguishable from the case of no streaming, and star formation will still proceed in the same way, with no change in the characteristic Pop III stellar masses. Reionization is expected to be dominated by halo masses of {approx}>10{sup 8} M{sub sun}, for which the effect of streaming should be negligible.

Authors:
;  [1];  [2]
  1. Department of Astronomy and Texas Cosmology Center, University of Texas at Austin, TX 78712 (United States)
  2. Astronomy Department, Harvard University, 60 Garden Street, Cambridge, MA 02138 (United States)
Publication Date:
OSTI Identifier:
21560442
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal Letters
Additional Journal Information:
Journal Volume: 730; Journal Issue: 1; Other Information: DOI: 10.1088/2041-8205/730/1/L1; Journal ID: ISSN 2041-8205
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BARYONS; CLOUDS; COSMOLOGY; DENSITY; GALAXIES; NONLUMINOUS MATTER; RED SHIFT; SIMULATION; STAR EVOLUTION; STARS; VELOCITY; ELEMENTARY PARTICLES; EVOLUTION; FERMIONS; HADRONS; MATTER; PHYSICAL PROPERTIES

Citation Formats

Stacy, Athena, Bromm, Volker, and Loeb, Abraham. EFFECT OF STREAMING MOTION OF BARYONS RELATIVE TO DARK MATTER ON THE FORMATION OF THE FIRST STARS. United States: N. p., 2011. Web. doi:10.1088/2041-8205/730/1/L1.
Stacy, Athena, Bromm, Volker, & Loeb, Abraham. EFFECT OF STREAMING MOTION OF BARYONS RELATIVE TO DARK MATTER ON THE FORMATION OF THE FIRST STARS. United States. https://doi.org/10.1088/2041-8205/730/1/L1
Stacy, Athena, Bromm, Volker, and Loeb, Abraham. Sun . "EFFECT OF STREAMING MOTION OF BARYONS RELATIVE TO DARK MATTER ON THE FORMATION OF THE FIRST STARS". United States. https://doi.org/10.1088/2041-8205/730/1/L1.
@article{osti_21560442,
title = {EFFECT OF STREAMING MOTION OF BARYONS RELATIVE TO DARK MATTER ON THE FORMATION OF THE FIRST STARS},
author = {Stacy, Athena and Bromm, Volker and Loeb, Abraham},
abstractNote = {We evaluate the effect of a supersonic relative velocity between the baryons and dark matter on the thermal and density evolution of the first gas clouds at z {approx}< 50. Through a series of cosmological simulations, initialized at z{sub i} = 100 with a range of relative streaming velocities and minihalo formation redshifts, we find that the typical streaming velocities will have little effect on the gas evolution. Once the collapse begins, the subsequent evolution of the gas will be nearly indistinguishable from the case of no streaming, and star formation will still proceed in the same way, with no change in the characteristic Pop III stellar masses. Reionization is expected to be dominated by halo masses of {approx}>10{sup 8} M{sub sun}, for which the effect of streaming should be negligible.},
doi = {10.1088/2041-8205/730/1/L1},
url = {https://www.osti.gov/biblio/21560442}, journal = {Astrophysical Journal Letters},
issn = {2041-8205},
number = 1,
volume = 730,
place = {United States},
year = {2011},
month = {3}
}