Search: onr:"swepub:oai:DiVA.org:uu-153304" >
Ices in the Quiesce...
Ices in the Quiescent IC 5146 Dense Cloud
- Article/chapterEnglish2011
Publisher, publication year, extent ...
Numbers
-
LIBRIS-ID:oai:DiVA.org:uu-153304
-
https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-153304URI
-
https://doi.org/10.1088/0004-637X/731/1/9DOI
Supplementary language notes
-
Language:English
-
Summary in:English
Part of subdatabase
Classification
-
Subject category:ref swepub-contenttype
-
Subject category:art swepub-publicationtype
Notes
-
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.
Subject headings and genre
Added entries (persons, corporate bodies, meetings, titles ...)
-
Pendleton, Y. J.
(author)
-
Allamandola, L. J.
(author)
-
Boogert, A. C. A.
(author)
-
Ennico, K.
(author)
-
Greene, T. P.
(author)
-
Geballe, T. R.
(author)
-
Keane, J. V.
(author)
-
Lada, C. J.
(author)
-
Mason, R. E.
(author)
-
Roellig, T. L.
(author)
-
Sandford, S. A.
(author)
-
Tielens, A. G. G. M.
(author)
-
Werner, M. W.
(author)
-
Whittet, D. C. B.
(author)
-
Decin, L.
(author)
-
Eriksson, KjellUppsala universitet,Teoretisk astrofysik(Swepub:uu)kjelerik
(author)
-
Uppsala universitetTeoretisk astrofysik
(creator_code:org_t)
Related titles
-
In:Astrophysical Journal731:1, s. 9-0004-637X1538-4357
Internet link
Find in a library
To the university's database
- By the author/editor
-
Chiar, J. E.
-
Pendleton, Y. J.
-
Allamandola, L. ...
-
Boogert, A. C. A ...
-
Ennico, K.
-
Greene, T. P.
-
show more...
-
Geballe, T. R.
-
Keane, J. V.
-
Lada, C. J.
-
Mason, R. E.
-
Roellig, T. L.
-
Sandford, S. A.
-
Tielens, A. G. G ...
-
Werner, M. W.
-
Whittet, D. C. B ...
-
Decin, L.
-
Eriksson, Kjell
-
show less...
- About the subject
-
- NATURAL SCIENCES
-
NATURAL SCIENCES
-
and Physical Science ...
-
and Astronomy Astrop ...
- Articles in the publication
-
Astrophysical Jo ...
- By the university
-
Uppsala University