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Astrophysical JournalVolume 895, Issue 2, 1 June 2020, Article number 101

Efficient Methanol Production on the Dark Side of a Prestellar Core(Article)(Open Access)

  • Harju, J.,
  • Pineda, J.E.,
  • Vasyunin, A.I.,
  • Caselli, P.,
  • Offner, S.S.R.,
  • Goodman, A.A.,
  • Juvela, M.,
  • Sipila, O.,
  • Faure, A.,
  • Le Gal, R.,
  • Hily-Blant, P.,
  • Alves, J.,
  • Bizzocchi, L.,
  • Burkert, A.,
  • Chen, H.,
  • Friesen, R.K.,
  • Güsten, R.,
  • Myers, P.C.,
  • Punanova, A.,
  • Rist, C.,
  • Rosolowsky, E.,
  • Schlemmer, S.,
  • Shirley, Y.,
  • Spezzano, S.,
  • Vastel, C.,
  • Wiesenfeld, L.
  Save all to author list
  • aMax-Planck-Institut für Extraterrestrische Physik, Gießenbachstraße 1, Garching, D-85748, Germany
  • bDepartment of Physics, University of Helsinki, P.O. BOX 64, FI-00014, Finland
  • cUral Federal University, 19 Mira street, Yekaterinburg, 620002, Russian Federation
  • dVentspils University of Applied Sciences, Inženieru 101, Ventspils, 3601, Latvia
  • eAstronomy Department, University of Texas, Austin, TX 78712, United States
  • fHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, United States
  • gUniversité Grenoble Alpes, IPAG, Grenoble, F-38000, France
  • hCNRS, IPAG, Grenoble, F-38000, France
  • iUniversity of Vienna, Türkenschanzstraße 17, Vienna, A-1880, Austria
  • jUniversitats-Sternwarte, Ludwig-Maximilians-Universitat München, Scheinerstraße 1, München, D-81679, Germany
  • kDunlap Institute for Astronomy and Astrophysics, University of Toronto, 50 St. George Street, Toronto, ON M5S 3H4, Canada
  • lMax-Planck-Institut für Radioastronomie, Auf dem Hügel 69, Bonn, D-53121, Germany
  • mDepartment of Physics, 4-181 CCIS, University of Alberta, Edmonton, AB T6G 2E1, Canada
  • nI. Physikalisches Institut, Universitat zu Köln, Zülpicher Straße 77, Köln, D-50937, Germany
  • oSteward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721, United States
  • pUniversité de Toulouse, UPS-OMP, IRAP, Toulouse, France
  • qCNRS, IRAP, 9 Avenue du Colonel Roche, BP 44346, Toulouse, Cedex 4, F-31028, France
  • rLaboratoire Aimé-Cotton, CNRS, Université Paris-Saclay, Orsay, F-91405, France

Abstract

We present Atacama Large Millimeter/submillimeter Array maps of the starless molecular cloud core Ophiuchus/H-MM1 in the lines of deuterated ammonia (ortho-NH2 D), methanol (CH3 OH), and sulfur monoxide (SO). The dense core is seen in NH2 D emission, whereas the CH3 OH and SO distributions form a halo surrounding the core. Because methanol is formed on grain surfaces, its emission highlights regions where desorption from grains is particularly efficient. Methanol and sulfur monoxide are most abundant in a narrow zone that follows the eastern side of the core. This side is sheltered from the stronger external radiation field coming from the west. We show that photodissociation on the illuminated side can give rise to an asymmetric methanol distribution but that the stark contrast observed in H-MM1 is hard to explain without assuming enhanced desorption on the shaded side. The region of the brightest emission has a wavy structure that rolls up at one end. This is the signature of Kelvin-Helmholtz instability occurring in sheared flows. We suggest that in this zone, methanol and sulfur are released as a result of grain-grain collisions induced by shear vorticity. © 2020. The American Astronomical Society. All rights reserved.

  • ISSN: 0004637X
  • Source Type: Journal
  • Original language: English
  • DOI: 10.3847/1538-4357/ab8f93
  • Document Type: Article
  • Publisher: Institute of Physics Publishing


© Copyright 2020 Elsevier B.V., All rights reserved.

Cited by 18 documents

Harju, J. , Pineda, J.E. , Sipilä, O.
Nuclear spin ratios of deuterated ammonia in prestellar cores LAsMA observations of H-MM1 and Oph D
(2024) Astronomy and Astrophysics
Riedel, W. , Sipilä, O. , Redaelli, E.
Modelling deuterated isotopologues of methanol towards the pre-stellar core L1544
(2023) Astronomy and Astrophysics
Lin, Y. , Spezzano, S. , Pineda, J.E.
Initial conditions of star formation at ≲2000 au: Physical structure and NH3 depletion of three early-stage cores
(2023) Astronomy and Astrophysics
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