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ALMA-IRDC: dense ga...
ALMA-IRDC: dense gas mass distribution from cloud to core scales
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- Barnes, A. T. (author)
- Universität Bonn,University of Bonn
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- Henshaw, J. D. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Fontani, F. (author)
- Max-Planck-Institut für extraterrestrische Physik,Max Planck Institute for Extraterrestrial Physics,Istituto nazionale di astrofisica (INAF)
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- Pineda, J. E. (author)
- Max-Planck-Institut für extraterrestrische Physik,Max Planck Institute for Extraterrestrial Physics
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- Cosentino, Giuliana, 1990 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Tan, Jonathan, 1973 (author)
- Chalmers tekniska högskola,Chalmers University of Technology,University of Virginia
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- Caselli, P. (author)
- Max-Planck-Institut für extraterrestrische Physik,Max Planck Institute for Extraterrestrial Physics
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Jimenez-Serra, I (author)
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- Law, Chi Yan, 1990 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Avison, A. (author)
- University of Manchester
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- Bigiel, F. (author)
- Universität Bonn,University of Bonn
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- Feng, S. (author)
- Chinese Academy of Sciences,National Institutes of Natural Sciences (NINS),Academia Sinica Taiwan
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- Kong, S. (author)
- University of Arizona
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- Longmore, S. N. (author)
- Liverpool John Moores University
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- Moser, L. (author)
- Universität Bonn,University of Bonn
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- Parker, R. J. (author)
- University of Sheffield
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- Sanchez-Monge, A. (author)
- Universität zu Köln,University of Cologne
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- Wang, K. (author)
- Beijing University of Technology
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Universität Bonn Max Planck Gesellschaft zur Förderung der Wissenschaften eV. (MPG) (creator_code:org_t)
- 2021-03-22
- 2021
- English.
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In: Monthly Notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 503:3, s. 4601-4626
- Related links:
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https://www.research...
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https://research.cha...
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https://doi.org/10.1...
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Abstract
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- Infrared dark clouds (IRDCs) are potential hosts of the elusive early phases of high mass star formation (HMSF). Here, we conduct an in-depth analysis of the fragmentation properties of a sample of 10 IRDCs, which have been highlighted as some of the best candidates to study HMSF within the Milky Way. To do so, we have obtained a set of large mosaics covering these IRDCs with Atacama Large Millimeter/submillimeter Array (ALMA) at Band 3 (or 3 mm). These observations have a high angular resolution (similar to 3 arcsec; similar to 0.05 pc), and high continuum and spectral line sensitivity (similar to 0.15 mJy beam(-1) and similar to 0.2 K per 0.1 km s(-1) channel at the N2H+ (1 - 0) transition). From the dust continuum emission, we identify 96 cores ranging from low to high mass (M = 3.4-50.9M(circle dot)) that are gravitationally bound (alpha(vir) = 0.3-1.3) and which would require magnetic field strengths of B = 0.3-1.0 mG to be in virial equilibrium. We combine these results with a homogenized catalogue of literature cores to recover the hierarchical structure within these clouds over four orders of magnitude in spatial scale (0.01-10 pc). Using supplementary observations at an even higher angular resolution, we find that the smallest fragments (<0.02 pc) within this hierarchy do not currently have the mass and/or the density required to form high-mass stars. None the less, the new ALMA observations presented in this paper have facilitated the identification of 19 (6 quiescent and 13 star-forming) cores that retain >16M(circle dot) without further fragmentation. These high-mass cores contain trans-sonic non-thermal motions, are kinematically sub-virial, and require moderate magnetic field strengths for support against collapse. The identification of these potential sites of HMSF represents a key step in allowing us to test the predictions from high-mass star and cluster formation theories.
Subject headings
- NATURVETENSKAP -- Fysik -- Subatomär fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Subatomic Physics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
Keyword
- stars: massive
- ISM: clouds
- stars: formation
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Barnes, A. T.
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Henshaw, J. D.
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Fontani, F.
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Pineda, J. E.
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Cosentino, Giuli ...
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Tan, Jonathan, 1 ...
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show more...
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Caselli, P.
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Jimenez-Serra, I
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Law, Chi Yan, 19 ...
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Avison, A.
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Bigiel, F.
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Feng, S.
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Kong, S.
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Longmore, S. N.
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Moser, L.
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Parker, R. J.
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Sanchez-Monge, A ...
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Wang, K.
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Subatomic Physic ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Other Physics To ...
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Monthly Notices ...
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Chalmers University of Technology