COLD WATER VAPOR IN THE BARNARD 5 MOLECULAR CLOUD

被引：7

作者：

Wirstrom, E. S. ^{[1
]}

Charnley, S. B. ^{[2
,3
]}

Persson, C. M. ^{[1
]}

Buckle, J. V. ^{[4
,5
]}

Cordiner, M. A. ^{[2
,3
,6
]}

Takakuwa, S. ^{[7
]}

机构：

[1] Chalmers Univ Technol, Onsala Space Observ, Dept Earth & Space Sci, SE-43992 Onsala, Sweden

[2] NASA Goddard Space Flight Ctr, Astrochem Lab, Greenbelt, MD 20770 USA

[3] NASA Goddard Space Flight Ctr, Goddard Ctr Astrobiol, Greenbelt, MD 20770 USA

[4] Cavendish Lab, Astrophys Grp, Cambridge CB3 0HE, England

[5] Kavli Inst Cosmol, Cambridge CB3 0HA, England

[6] Catholic Univ Amer, Inst Astrophys & Computat Sci, Washington, DC 20064 USA

[7] Acad Sinica, Inst Astron & Astrophys, Taipei 106, Taiwan

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2014年 / 788卷 / 02期

关键词：

astrochemistry; ISM: individual objects (Barnard 5); ISM: molecules; stars: formation; submillimeter: ISM; STAR-FORMING REGIONS; ROTATIONAL-EXCITATION; RADIATIVE-TRANSFER; EMISSION; CORES; CH3OH; SPECTROSCOPY; (HCO+)-C-13; DESORPTION; ABUNDANCE;

D O I：

10.1088/2041-8205/788/2/L32

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页数：5

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