ICES IN THE QUIESCENT IC 5146 DENSE CLOUD

被引：53

作者：

Chiar, J. E. ^{[1
]}

Pendleton, Y. J. ^{[2
]}

Allamandola, L. J. ^{[2
]}

Boogert, A. C. A. ^{[3
]}

Ennico, K. ^{[2
]}

Greene, T. P. ^{[2
]}

Geballe, T. R. ^{[4
]}

Keane, J. V. ^{[5
]}

Lada, C. J. ^{[6
]}

Mason, R. E. ^{[4
]}

Roellig, T. L. ^{[2
]}

Sandford, S. A. ^{[2
]}

Tielens, A. G. G. M. ^{[7
]}

Werner, M. W. ^{[8
]}

Whittet, D. C. B. ^{[9
]}

Decin, L. ^{[10
]}

Eriksson, K. ^{[11
]}

机构：

[1] Carl Sagan Ctr, SETI Inst, Mountain View, CA 94035 USA

[2] NASA, Ames Res Ctr, Moffett Field, CA 94035 USA

[3] CALTECH, IPAC, NASA, Herschel Sci Ctr, Pasadena, CA 91125 USA

[4] No Operat Ctr, Gemini Observ, Hilo, HI 96720 USA

[5] Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA

[6] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[7] Leiden Observ, NL-2300 RA Leiden, Netherlands

[8] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA

[9] Rensselaer Polytech Inst, New York Ctr Astrobiol, Dept Phys Appl Phys & Astron, Troy, NY 12180 USA

[10] Katholieke Univ Leuven, Inst Sterrenkunde, B-3001 Louvain, Belgium

[11] Uppsala Univ, Dept Phys & Astron, S-75120 Uppsala, Sweden

来源：

ASTROPHYSICAL JOURNAL | 2011年 / 731卷 / 01期

基金：

美国国家科学基金会;

关键词：

astrochemistry; dust; extinction; infrared: ISM; ISM: individual objects (IC 5146); ISM: molecules; TAURUS DARK CLOUDS; SPITZER-SPACE-TELESCOPE; YOUNG STELLAR OBJECTS; DIFFUSE INTERSTELLAR-MEDIUM; SOLID CARBON-MONOXIDE; 3 MICRON SPECTRA; INFRARED-SPECTROSCOPY; MOLECULAR-CLOUD; ABSORPTION FEATURES; ABSOLUTE CALIBRATION;

D O I：

10.1088/0004-637X/731/1/9

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

This paper presents spectra in the 2 to 20 mu m range of quiescent cloud material located in the IC 5146 cloud complex. The spectra were obtained with NASA's Infrared Telescope Facility SpeX instrument and the Spitzer Space Telescope's Infrared Spectrometer. We use these spectra to investigate dust and ice absorption features in pristine regions of the cloud that are unaltered by embedded stars. We find that the H2O-ice threshold extinction is 4.03 +/- 0.05 mag. Once foreground extinction is taken into account, however, the threshold drops to 3.2 mag, equivalent to that found for the Taurus dark cloud, generally assumed to be the touchstone quiescent cloud against which all other dense cloud and embedded young stellar object observations are compared. Substructure in the trough of the silicate band for two sources is attributed to CH3OH and NH3 in the ices, present at the similar to 2% and similar to 5% levels, respectively, relative to H2O-ice. The correlation of the silicate feature with the E(J-K) color excess is found to follow a much shallower slope relative to lines of sight that probe diffuse clouds, supporting the previous results by Chiar et al.

引用

页数：14

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