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Title: Simulating radiative magnetohydrodynamical flows with astrobear : implementation and applications of non-equilibrium cooling

Abstract

Radiative cooling plays a crucial role in the dynamics of many astrophysical flows, and is particularly important in the dense shocked gas within Herbig-Haro (HH) objects and stellar jets. Simulating cooling processes accurately is necessary to compare numerical simulations with existing and planned observations of HH objects, such as those from the Hubble Space Telescope and the James Webb Space Telescope. In this paper, we discuss a new, non-equilibrium cooling scheme we have implemented into the three-dimensional magnetohydrodynamic (MHD) code ASTROBEAR. The new cooling function includes ionization, recombination, and excitation of all the important atomic species that cool below 10 000 K. We tested the routine by comparing its predictions with those from the well-tested one-dimensional Cox–Raymond shock code (Raymond 1979). The results show that ASTROBEAR accurately tracks the ionization fraction, temperature, and other MHD variables for all low-velocity (≲90 km s-1) magnetized radiative shock waves. The new routine allows us to predict synthetic emission maps in all the bright forbidden and permitted lines observed in stellar jets, including H α, [N II], [O I], and [S II]. We present an example as to how these synthetic maps facilitate a direct comparison with narrowband images of HH objects.

Authors:
ORCiD logo [1];  [2];  [3]; ORCiD logo [2];  [4]
  1. Laboratory for Laser Energetics, University of Rochester, Rochester, NY 14623, USA
  2. Department of Physics and Astronomy, Rice University, 6100 S. Main, Houston, TX 77521, USA
  3. Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627, USA
  4. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
Publication Date:
Research Org.:
Rice Univ., Houston, TX (United States); Univ. of Rochester, NY (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); Space Telescope Science Institute; National Science Foundation (NSF)
OSTI Identifier:
1472141
Alternate Identifier(s):
OSTI ID: 1614474
Grant/Contract Number:  
SC0001063; NA0002037; NA0002722; HST-AR-11251.01-A (2007); HST-AR-12128.01-A; HST-AR013892.001-A
Resource Type:
Published Article
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 481 Journal Issue: 3; Journal ID: ISSN 0035-8711
Publisher:
Oxford University Press
Country of Publication:
United Kingdom
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Astronomy & Astrophysics; line: formation; (magnetohydrodynamics) MHD; radiation mechanisms: thermal; methods: numerical; (ISM:) Herbig-Haro objects; ISM: jets and outflows

Citation Formats

Hansen, E. C., Hartigan, P., Frank, A., Wright, A., and Raymond, J. C. Simulating radiative magnetohydrodynamical flows with astrobear : implementation and applications of non-equilibrium cooling. United Kingdom: N. p., 2018. Web. doi:10.1093/mnras/sty2471.
Hansen, E. C., Hartigan, P., Frank, A., Wright, A., & Raymond, J. C. Simulating radiative magnetohydrodynamical flows with astrobear : implementation and applications of non-equilibrium cooling. United Kingdom. doi:https://doi.org/10.1093/mnras/sty2471
Hansen, E. C., Hartigan, P., Frank, A., Wright, A., and Raymond, J. C. Fri . "Simulating radiative magnetohydrodynamical flows with astrobear : implementation and applications of non-equilibrium cooling". United Kingdom. doi:https://doi.org/10.1093/mnras/sty2471.
@article{osti_1472141,
title = {Simulating radiative magnetohydrodynamical flows with astrobear : implementation and applications of non-equilibrium cooling},
author = {Hansen, E. C. and Hartigan, P. and Frank, A. and Wright, A. and Raymond, J. C.},
abstractNote = {Radiative cooling plays a crucial role in the dynamics of many astrophysical flows, and is particularly important in the dense shocked gas within Herbig-Haro (HH) objects and stellar jets. Simulating cooling processes accurately is necessary to compare numerical simulations with existing and planned observations of HH objects, such as those from the Hubble Space Telescope and the James Webb Space Telescope. In this paper, we discuss a new, non-equilibrium cooling scheme we have implemented into the three-dimensional magnetohydrodynamic (MHD) code ASTROBEAR. The new cooling function includes ionization, recombination, and excitation of all the important atomic species that cool below 10 000 K. We tested the routine by comparing its predictions with those from the well-tested one-dimensional Cox–Raymond shock code (Raymond 1979). The results show that ASTROBEAR accurately tracks the ionization fraction, temperature, and other MHD variables for all low-velocity (≲90 km s-1) magnetized radiative shock waves. The new routine allows us to predict synthetic emission maps in all the bright forbidden and permitted lines observed in stellar jets, including H α, [N II], [O I], and [S II]. We present an example as to how these synthetic maps facilitate a direct comparison with narrowband images of HH objects.},
doi = {10.1093/mnras/sty2471},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 3,
volume = 481,
place = {United Kingdom},
year = {2018},
month = {9}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: https://doi.org/10.1093/mnras/sty2471

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Cited by: 2 works
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