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H i Kinematics along the Minor Axis of M82

Journal Article · · The Astrophysical Journal (Online)
 [1];  [2];  [3];  [4];  [5];  [6];  [7]
  1. The Ohio State Univ., Columbus, OH (United States); DOE/OSTI
  2. The Ohio State Univ., Columbus, OH (United States)
  3. National Radio Astronomy Observatory, Charlottesville, VA (United States)
  4. Univ. of Maryland, College Park, MD (United States)
  5. Rincon Research Corp., Tucson, AZ (United States)
  6. Univ. of California, San Diego, CA (United States)
  7. Max Planck Inst. für Astronomie, Heidelberg (Germany)
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.
Research Organization:
The Ohio State Univ., Columbus, OH (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Grant/Contract Number:
SC0015525
OSTI ID:
1542019
Journal Information:
The Astrophysical Journal (Online), Journal Name: The Astrophysical Journal (Online) Journal Issue: 1 Vol. 856; ISSN 1538-4357
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (14)

Evolution of compact groups from intermediate to final stages: A case study of the H I content of HCG 16⋆ journal December 2019
A model for the minimum mass of bound stellar clusters and its dependence on the galactic environment journal July 2019
A multiwavelength study of a massive, active galaxy at z ∼ 2: coupling the kinematics of the ionized and molecular gas journal August 2019
Charge-exchange emission and cold clumps in multiphase galactic outflows journal November 2019
MusE GAs FLOw and Wind (MEGAFLOW) IV. A two sightline tomography of a galactic wind journal December 2019
A Review of Recent Observations of Galactic Winds Driven by Star Formation journal December 2018
The Origin of Interstellar Turbulence in M33 journal January 2019
SOFIA Far-infrared Imaging Polarimetry of M82 and NGC 253: Exploring the Supergalactic Wind journal January 2019
A Review of Recent Observations of Galactic Winds Driven by Star Formation text January 2018
SOFIA Far Infrared Imaging Polarimetry of M82 and NGC 253: Exploring the Super-Galactic Wind text January 2018
A multi-wavelength study of a massive, active galaxy at $z\sim 2$: coupling the kinematics of the ionized and molecular gas text January 2019
Evolution of compact groups from intermediate to final stages: A case study of the HI content of HCG 16 text January 2019
MusE GAs FLOw and Wind (MEGAFLOW) IV: A two sightline tomography of a galactic wind text January 2019
Charge exchange emission and cold clumps in multi-phase galactic outflows text January 2019

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