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ALMA Imaging of a Galactic Molecular Outflow in NGC 4945

Bolatto, Alberto D. (author)
University of Maryland,Flatiron Institute,National Radio Astronomy Observatory
Leroy, Adam K. (author)
Ohio State University
Levy, Rebecca C. (author)
University of Maryland
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Meier, David S. (author)
New Mexico Institute of Mining and Technology,National Radio Astronomy Observatory Socorro
Mills, Elisabeth A. C. (author)
University of Kansas
Thompson, Todd A. (author)
Ohio State University
Emig, Kimberly L. (author)
National Radio Astronomy Observatory
Veilleux, Sylvain (author)
University of Maryland
Ott, Juergen (author)
National Radio Astronomy Observatory Socorro
Gorski, Mark, 1989 (author)
Chalmers tekniska högskola,Chalmers University of Technology
Walter, Fabian (author)
National Radio Astronomy Observatory Socorro,Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
Lopez, Laura A. (author)
Ohio State University
Lenkic, Laura (author)
University of Maryland
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 (creator_code:org_t)
2021-12-13
2021
English.
In: Astrophysical Journal. - : American Astronomical Society. - 1538-4357 .- 0004-637X. ; 923:1
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  • Journal article (peer-reviewed)
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  • We present the ALMA detection of molecular outflowing gas in the central regions of NGC 4945, one of the nearest starbursts and also one of the nearest hosts of an active galactic nucleus (AGN). We detect four outflow plumes in CO J= 3 - 2 at similar to 0.3 resolution that appear to correspond to molecular gas located near the edges of the known ionized outflow cone and its (unobserved) counterpart behind the disk. The fastest and brightest of these plumes has emission reaching observed line-of-sight projected velocities of over 450 km s(-1) beyond systemic, equivalent to an estimated physical outflow velocity v greater than or similar to 600 km s(-1) for the fastest emission. Most of these plumes have corresponding emission in HCN or HCO + J= 4 - 3. We discuss a kinematic model for the outflow emission where the molecular gas has the geometry of the ionized gas cone and shares the rotation velocity of the galaxy when ejected. We use this model to explain the velocities we observe, constrain the physical speed of the ejected material, and account for the fraction of outflowing gas that is not detected due to confusion with the galaxy disk. We estimate a total molecular mass outflow rate (M) over dot(mol) similar to 20 M-circle dot yr(-1) flowing through a surface within 100 pc of the disk midplane, likely driven by a combination of the central starburst and AGN.

Subject headings

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

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