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Eva Wirström (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; S. B. Charnley ; Carina M. Persson (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; J. V. Buckle ; M. A. Cordiner ; S. Takakuwa
Astrophysical Journal Letters (2041-8205). Vol. 788 (2014), 2,
[Artikel, refereegranskad vetenskaplig]

After more than 30 yr of investigations, the nature of gas-grain interactions at low temperatures remains an unresolved issue in astrochemistry. Water ice is the dominant ice found in cold molecular clouds; however, there is only one region where cold (similar to 10 K) water vapor has been detected-L1544. This study aims to shed light on ice desorption mechanisms under cold cloud conditions by expanding the sample. The clumpy distribution of methanol in dark clouds testifies to transient desorption processes at work-likely to also disrupt water ice mantles. Therefore, the Herschel HIFI instrument was used to search for cold water in a small sample of prominent methanol emission peaks. We report detections of the ground-state transition of o-H2O (J = 1(10)-1(01)) at 556.9360 GHz toward two positions in the cold molecular cloud, Barnard 5. The relative abundances of methanol and water gas support a desorption mechanism which disrupts the outer ice mantle layers, rather than causing complete mantle removal.

Nyckelord: astrochemistry, ISM: individual objects (Barnard 5), ISM: molecules, stars: formation, submillimeter: ISM, WAVE-ASTRONOMY-SATELLITE, STAR-FORMING REGIONS, ROTATIONAL-EXCITATION, RADIATIVE-TRANSFER, LINE OBSERVATIONS, DENSE CLOUDS, HERSCHEL, EMISSION, CORES, CH3OH, Astronomy & Astrophysics, ASAD SS, 1983, ASTROPHYSICAL JOURNAL, V267, P603

Denna post skapades 2014-08-01. Senast ändrad 2015-02-05.
CPL Pubid: 200802


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Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik


Fusion, plasma och rymdfysik

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