The first frost in the Pipe Nebula
The first frost in the Pipe Nebula
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管道星云中的第一场霜冻
DOI:
10.1051/0004-6361/201629830
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发表时间:
2018
期刊:
影响因子:
--
通讯作者:
Spaans
中科院分区:
文献类型:
--
作者:
Bailey;Jeffrey D;Caselli;Esplugues;Gisela B;Cazaux;Stephanie;Spaans
ContextSpectroscopic studies of ices in nearby star-forming regions indicate that ice mantles form on dust grains in two distinct steps, starting with polar ice formation (H2O rich) and switching to apolar ice (CO rich).AimsWe test how well the picture applies to more diffuse and quiescent clouds where the formation of the first layers of ice mantles can be witnessed.MethodsMedium-resolution near-infrared spectra are obtained toward background field stars behind the Pipe Nebula.ResultsThe water ice absorption is positively detected at 3.0μm in seven lines of sight out of 21 sources for which observed spectra are successfully reduced. The peak optical depth of the water ice is significantly lower than those in Taurus with the sameAV. The source with the highest water-ice optical depth shows CO ice absorption at 4.7μm as well. The fractional abundance of CO ice with respect to water ice is 16-6+7%, and about half as much as the values typically seen in low-mass star-forming regions.ConclusionsA small fractional abundance of CO ice is consistent with some of the existing simulations. Observations of CO2ice in the early diffuse phase of a cloud play a decisive role in understanding the switching mechanism between polar and apolar ice formation.
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DOI:
10.1088/0004-637x/696/2/1407
发表时间:
2009-02
期刊:
The Astrophysical Journal
影响因子:
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作者:
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通讯作者:
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DOI:
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发表时间:
2013
期刊:
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作者:
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通讯作者:
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DOI:
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发表时间:
1999
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作者:
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通讯作者:
Y. Fukui
DOI:
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发表时间:
2004
期刊:
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作者:
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通讯作者:
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DOI:
10.1088/0004-637x/690/2/1497
发表时间:
2008
期刊:
The Astrophysical Journal
影响因子:
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作者:
D. Hollenbach;M. Kaufman;E. Bergin;G. Melnick
通讯作者:
G. Melnick