Efficient Methanol Production on the Dark Side of a Prestellar Core

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Harju , J , Pineda , J E , Vasyunin , A , Caselli , P , Offner , S S R , Goodman , A A , Juvela , M , Sipilä , O , Faure , A , Le Gal , R , Hily-Blant , P , Alves , J , Bizzocchi , L , Burkert , A , Chen , H , Friesen , R K , Guesten , R , Myers , P C , Punanova , A , Rist , C , Rosolowsky , E , Schlemmer , S , Shirley , Y , Spezzano , S , Vastel , C & Wiesenfeld , L 2020 , ' Efficient Methanol Production on the Dark Side of a Prestellar Core ' , Astrophysical Journal , vol. 895 , no. 2 , 101 . https://doi.org/10.3847/1538-4357/ab8f93

Title: Efficient Methanol Production on the Dark Side of a Prestellar Core
Author: Harju, Jorma; Pineda, Jaime E.; Vasyunin, Anton; Caselli, Paola; Offner, Stella S. R.; Goodman, Alyssa A.; Juvela, Mika; Sipilä, Olli; Faure, Alexandre; Le Gal, Romane; Hily-Blant, Pierre; Alves, Joao; Bizzocchi, Luca; Burkert, Andreas; Chen, Hope; Friesen, Rachel K.; Guesten, Rolf; Myers, Philip C.; Punanova, Anna; Rist, Claire; Rosolowsky, Erik; Schlemmer, Stephan; Shirley, Yancy; Spezzano, Silvia; Vastel, Charlotte; Wiesenfeld, Laurent
Other contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2020-06
Language: eng
Number of pages: 18
Belongs to series: Astrophysical Journal
ISSN: 0004-637X
DOI: https://doi.org/10.3847/1538-4357/ab8f93
URI: http://hdl.handle.net/10138/330501
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-NH2D), methanol (CH3OH), and sulfur monoxide (SO). The dense core is seen in NH2D emission, whereas the CH3OH 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.
Subject: ABSORPTION CROSS-SECTIONS
MOLECULAR COMPOSITION
INTERSTELLAR MATTER
DUST
CLOUD
DESORPTION
CHEMISTRY
WATER
GAS
RADIATION
115 Astronomy, Space science
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