Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/101512
Title: Efficient Methanol Production on the Dark Side of a Prestellar Core
Authors: 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.
Issue Date: 2020
Publisher: Institute of Physics Publishing
Citation: Efficient Methanol Production on the Dark Side of a Prestellar Core / J. Harju, J. E. Pineda, A. I. Vasyunin, et al. — DOI 10.3847/1538-4357/ab8f93 // Astrophysical Journal. — 2020. — Vol. 895. — Iss. 2. — 101.
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.
URI: http://hdl.handle.net/10995/101512
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85086174231
PURE ID: 13162749
8129ae24-2ef1-4081-a8bc-5334593d1ec0
ISSN: 0004637X
DOI: 10.3847/1538-4357/ab8f93
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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