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Title: H i Kinematics along the Minor Axis of M82

Abstract

M82 is one of the best-studied starburst galaxies in the local universe, and is consequently a benchmark for researching star formation feedback at both low and high redshift. We introduce new VLA H i observations that reveal the cold gas kinematics along the minor axis in unprecedented detail. This includes the detection of H i up to 10 kpc along the minor axis toward the south and beyond 5 kpc to the north. A surprising aspect of these observations is that the line-of-sight H i velocity decreases substantially from about 120 to $$50\,\mathrm{km}\,{{\rm{s}}}^{-1}$$ from 1.5 to 10 kpc off the midplane. The velocity profile is not consistent with the H i gas cooling from the hot wind. We determine that the velocity decrease is substantially greater than the deceleration expected from gravitational forces alone. If the H i consists of a continuous population of cold clouds, some additional drag force must be present, and the magnitude of the drag force places a joint constraint on the ratio of the ambient medium to the typical cloud size and density. We also demonstrate that the H i kinematics are inconsistent with a simple conical outflow centered on the nucleus, but instead require the more widespread launch of the H i over the ~1 kpc extent of the starburst region. Regardless of the launch mechanism for the H i gas, the observed velocity decrease along the minor axis is sufficiently great that the H i may not escape the halo of M82. The inferred H i outflow rate at 10 kpc off the midplane is much less than 1 $${M}_{\odot }$$ yr–1.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [2];  [3];  [4]; ORCiD logo [5]; ORCiD logo [6]
  1. The Ohio State Univ., Columbus, OH (United States)
  2. National Radio Astronomy Observatory, Charlottesville, VA (United States)
  3. Univ. of Maryland, College Park, MD (United States)
  4. Rincon Research Corp., Tucson, AZ (United States)
  5. Univ. of California, San Diego, CA (United States)
  6. Max Planck Inst. für Astronomie, Heidelberg (Germany)
Publication Date:
Research Org.:
The Ohio State Univ., Columbus, OH (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); National Science Foundation (NSF)
OSTI Identifier:
1542019
Grant/Contract Number:  
SC0015525
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 856; Journal Issue: 1; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; galaxies: individual (M82); galaxies: ISM; galaxies: starburst; intergalactic medium; ISM: jets and outflows; ISM: molecules

Citation Formats

Martini, Paul, Leroy, Adam K., Mangum, Jeffrey G., Bolatto, Alberto, Keating, Katie M., Sandstrom, Karin, and Walter, Fabian. H i Kinematics along the Minor Axis of M82. United States: N. p., 2018. Web. doi:10.3847/1538-4357/aab08e.
Martini, Paul, Leroy, Adam K., Mangum, Jeffrey G., Bolatto, Alberto, Keating, Katie M., Sandstrom, Karin, & Walter, Fabian. H i Kinematics along the Minor Axis of M82. United States. doi:10.3847/1538-4357/aab08e.
Martini, Paul, Leroy, Adam K., Mangum, Jeffrey G., Bolatto, Alberto, Keating, Katie M., Sandstrom, Karin, and Walter, Fabian. Mon . "H i Kinematics along the Minor Axis of M82". United States. doi:10.3847/1538-4357/aab08e. https://www.osti.gov/servlets/purl/1542019.
@article{osti_1542019,
title = {H i Kinematics along the Minor Axis of M82},
author = {Martini, Paul and Leroy, Adam K. and Mangum, Jeffrey G. and Bolatto, Alberto and Keating, Katie M. and Sandstrom, Karin and Walter, Fabian},
abstractNote = {M82 is one of the best-studied starburst galaxies in the local universe, and is consequently a benchmark for researching star formation feedback at both low and high redshift. We introduce new VLA H i observations that reveal the cold gas kinematics along the minor axis in unprecedented detail. This includes the detection of H i up to 10 kpc along the minor axis toward the south and beyond 5 kpc to the north. A surprising aspect of these observations is that the line-of-sight H i velocity decreases substantially from about 120 to $50\,\mathrm{km}\,{{\rm{s}}}^{-1}$ from 1.5 to 10 kpc off the midplane. The velocity profile is not consistent with the H i gas cooling from the hot wind. We determine that the velocity decrease is substantially greater than the deceleration expected from gravitational forces alone. If the H i consists of a continuous population of cold clouds, some additional drag force must be present, and the magnitude of the drag force places a joint constraint on the ratio of the ambient medium to the typical cloud size and density. We also demonstrate that the H i kinematics are inconsistent with a simple conical outflow centered on the nucleus, but instead require the more widespread launch of the H i over the ~1 kpc extent of the starburst region. Regardless of the launch mechanism for the H i gas, the observed velocity decrease along the minor axis is sufficiently great that the H i may not escape the halo of M82. The inferred H i outflow rate at 10 kpc off the midplane is much less than 1 ${M}_{\odot }$ yr–1.},
doi = {10.3847/1538-4357/aab08e},
journal = {The Astrophysical Journal (Online)},
number = 1,
volume = 856,
place = {United States},
year = {2018},
month = {3}
}

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