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Title: Design and Scaling of an Omega-EP Experiment to Study Cold Streams Feeding Early Galaxies

Abstract

Galaxies form in the centers of dark matter halos, and grow by accreting gas from the halos. The gas supply to the galaxy is the bottleneck for star formation and ultimately sets its stellar mass and star formation rate. As gas falls from the cosmic web into the halos, the highly supersonic infalling gas (Mach ~20 for Milky Way-type halos) eventually forms a shock. If cooling is inefficient, this shock quickly stabilizes as a quasi-static slowly expanding accretion shock at the outer edge of the halo. If, however, cooling is important, a recent theory suggests that filaments of gas from the cosmic web will freefall unshocked through the halos, and shock only at the outskirts of the central galaxies. Furthermore, these "cold streams" allow for a steady supply of gas into the galaxies and for more efficient star formation. The cold dense filament flowing into a hot less dense environment is potentially Kelvin–Helmholtz unstable. This instability may hinder the ability of the stream to deliver gas deeply enough into the halo. A design of a well-scaled laser experiment on Omega-EP meant for studying this phenomena is presented in the current work, with relevant theory informed by 2D hydrodynamic simulations ofmore » the experiment. We establish the hydrodynamic scaling analysis between the cosmological system and its experimental analog, presenting the experiment as an adiabatic upper limit to informing the role of mixing due to the Kelvin–Helmholtz instability.« less

Authors:
 [1];  [2];  [2]; ORCiD logo [3];  [2]; ORCiD logo [2];  [4]
  1. Univ. of Michigan, Ann Arbor, MI (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Univ. of Michigan, Ann Arbor, MI (United States)
  3. The Hebrew University, Jerusalem (Israel)
  4. Univ. of Michigan, Ann Arbor, MI (United States); Nuclear Research Center e Negev, Beer-Shev (Israel)
Publication Date:
Research Org.:
Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1638343
Grant/Contract Number:  
NA0003869; NA0002956; NA0002719; NA0001944
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal. Supplement Series (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal. Supplement Series (Online); Journal Volume: 245; Journal Issue: 2; Journal ID: ISSN 1538-4365
Publisher:
American Astronomical Society/IOP
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Kelvin-Helmholtz instability; galaxy formation; shock wave; halos

Citation Formats

Coffing, Shane X., Angulo, Adriana A., Trantham, Matthew R., Birnboim, Yuval, Kuranz, Carolyn C., Drake, R. P., and Malamud, Guy. Design and Scaling of an Omega-EP Experiment to Study Cold Streams Feeding Early Galaxies. United States: N. p., 2019. Web. https://doi.org/10.3847/1538-4365/ab4a15.
Coffing, Shane X., Angulo, Adriana A., Trantham, Matthew R., Birnboim, Yuval, Kuranz, Carolyn C., Drake, R. P., & Malamud, Guy. Design and Scaling of an Omega-EP Experiment to Study Cold Streams Feeding Early Galaxies. United States. https://doi.org/10.3847/1538-4365/ab4a15
Coffing, Shane X., Angulo, Adriana A., Trantham, Matthew R., Birnboim, Yuval, Kuranz, Carolyn C., Drake, R. P., and Malamud, Guy. Fri . "Design and Scaling of an Omega-EP Experiment to Study Cold Streams Feeding Early Galaxies". United States. https://doi.org/10.3847/1538-4365/ab4a15. https://www.osti.gov/servlets/purl/1638343.
@article{osti_1638343,
title = {Design and Scaling of an Omega-EP Experiment to Study Cold Streams Feeding Early Galaxies},
author = {Coffing, Shane X. and Angulo, Adriana A. and Trantham, Matthew R. and Birnboim, Yuval and Kuranz, Carolyn C. and Drake, R. P. and Malamud, Guy},
abstractNote = {Galaxies form in the centers of dark matter halos, and grow by accreting gas from the halos. The gas supply to the galaxy is the bottleneck for star formation and ultimately sets its stellar mass and star formation rate. As gas falls from the cosmic web into the halos, the highly supersonic infalling gas (Mach ~20 for Milky Way-type halos) eventually forms a shock. If cooling is inefficient, this shock quickly stabilizes as a quasi-static slowly expanding accretion shock at the outer edge of the halo. If, however, cooling is important, a recent theory suggests that filaments of gas from the cosmic web will freefall unshocked through the halos, and shock only at the outskirts of the central galaxies. Furthermore, these "cold streams" allow for a steady supply of gas into the galaxies and for more efficient star formation. The cold dense filament flowing into a hot less dense environment is potentially Kelvin–Helmholtz unstable. This instability may hinder the ability of the stream to deliver gas deeply enough into the halo. A design of a well-scaled laser experiment on Omega-EP meant for studying this phenomena is presented in the current work, with relevant theory informed by 2D hydrodynamic simulations of the experiment. We establish the hydrodynamic scaling analysis between the cosmological system and its experimental analog, presenting the experiment as an adiabatic upper limit to informing the role of mixing due to the Kelvin–Helmholtz instability.},
doi = {10.3847/1538-4365/ab4a15},
journal = {The Astrophysical Journal. Supplement Series (Online)},
number = 2,
volume = 245,
place = {United States},
year = {2019},
month = {12}
}

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