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  • Barnes, A. T.Universität Bonn,University of Bonn (author)

ALMA-IRDC: dense gas mass distribution from cloud to core scales

  • Article/chapterEnglish2021

Publisher, publication year, extent ...

  • 2021-03-22
  • Oxford University Press (OUP),2021

Numbers

  • LIBRIS-ID:oai:research.chalmers.se:c1d56e17-7ab3-4028-944f-acab2b4bc1a8
  • https://research.chalmers.se/publication/524387URI
  • https://doi.org/10.1093/mnras/stab803DOI

Supplementary language notes

  • Language:English
  • Summary in:English

Part of subdatabase

Classification

  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • 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 and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Henshaw, J. D.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
  • Fontani, F.Max-Planck-Institut für extraterrestrische Physik,Max Planck Institute for Extraterrestrial Physics,Istituto nazionale di astrofisica (INAF) (author)
  • Pineda, J. E.Max-Planck-Institut für extraterrestrische Physik,Max Planck Institute for Extraterrestrial Physics (author)
  • Cosentino, Giuliana,1990Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)giuliana (author)
  • Tan, Jonathan,1973Chalmers tekniska högskola,Chalmers University of Technology,University of Virginia(Swepub:cth)tanj (author)
  • Caselli, P.Max-Planck-Institut für extraterrestrische Physik,Max Planck Institute for Extraterrestrial Physics (author)
  • Jimenez-Serra, I (author)
  • Law, Chi Yan,1990Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)ychi (author)
  • Avison, A.University of Manchester (author)
  • Bigiel, F.Universität Bonn,University of Bonn (author)
  • Feng, S.Chinese Academy of Sciences,National Institutes of Natural Sciences (NINS),Academia Sinica Taiwan (author)
  • Kong, S.University of Arizona (author)
  • Longmore, S. N.Liverpool John Moores University (author)
  • Moser, L.Universität Bonn,University of Bonn (author)
  • Parker, R. J.University of Sheffield (author)
  • Sanchez-Monge, A.Universität zu Köln,University of Cologne (author)
  • Wang, K.Beijing University of Technology (author)
  • Universität BonnMax Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG) (creator_code:org_t)

Related titles

  • In:Monthly Notices of the Royal Astronomical Society: Oxford University Press (OUP)503:3, s. 4601-46260035-87111365-2966

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