Harju, Jorma ORCID: 0000-0002-1189-9790, Pineda, Jaime E., Vasyunin, Anton, I, Caselli, Paola, Offner, Stella S. R., Goodman, Alyssa A., Juvela, Mika ORCID: 0000-0002-5809-4834, Sipilae, Olli, Faure, Alexandre ORCID: 0000-0001-7199-2535, 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 and Wiesenfeld, Laurent (2020). Efficient Methanol Production on the Dark Side of a Prestellar Core. Astrophys. J., 895 (2). BRISTOL: IOP PUBLISHING LTD. ISSN 1538-4357

Full text not available from this repository.

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.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Harju, JormaUNSPECIFIEDorcid.org/0000-0002-1189-9790UNSPECIFIED
Pineda, Jaime E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Vasyunin, Anton, IUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Caselli, PaolaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Offner, Stella S. R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Goodman, Alyssa A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Juvela, MikaUNSPECIFIEDorcid.org/0000-0002-5809-4834UNSPECIFIED
Sipilae, OlliUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Faure, AlexandreUNSPECIFIEDorcid.org/0000-0001-7199-2535UNSPECIFIED
Le Gal, RomaneUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hily-Blant, PierreUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Alves, JoaoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bizzocchi, LucaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Burkert, AndreasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Chen, HopeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Friesen, Rachel K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Guesten, RolfUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Myers, Philip C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Punanova, AnnaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rist, ClaireUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rosolowsky, ErikUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schlemmer, StephanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Shirley, YancyUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Spezzano, SilviaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Vastel, CharlotteUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wiesenfeld, LaurentUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-331836
DOI: 10.3847/1538-4357/ab8f93
Journal or Publication Title: Astrophys. J.
Volume: 895
Number: 2
Date: 2020
Publisher: IOP PUBLISHING LTD
Place of Publication: BRISTOL
ISSN: 1538-4357
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
ABSORPTION CROSS-SECTIONS; MOLECULAR COMPOSITION; INTERSTELLAR MATTER; DUST; CLOUD; DESORPTION; CHEMISTRY; WATER; GAS; RADIATIONMultiple languages
Astronomy & AstrophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/33183

Downloads

Downloads per month over past year

Altmetric

Export

Actions (login required)

View Item View Item