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Detection of inters...
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Welty, Daniel E.University of Chicago
(författare)
Detection of interstellar C2 and C3 in the Small Magellanic Cloud
- Artikel/kapitelEngelska2013
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2012-10-26
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Oxford University Press (OUP),2013
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LIBRIS-ID:oai:research.chalmers.se:08b2d682-ff62-426a-9a95-e3532a7558e3
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https://research.chalmers.se/publication/170670URI
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https://doi.org/10.1093/mnras/sts093DOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:art swepub-publicationtype
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Ämneskategori:ref swepub-contenttype
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We report the detection of absorption from interstellar C2 and C3 towards the moderately reddened star Sk 143, located in the near `wing' region of the SMC, in optical spectra obtained with the European Southern Observatory Very Large Telescope (VLT)/Ultraviolet and Visual Echelle Spectrograph. These detections of C2 (rotational levels J = 0-8) and C3 (J = 0-12) absorption in the SMC are the first beyond our Galaxy. The total abundances of C2 and C3 (relative to H2) are similar to those found in diffuse Galactic molecular clouds - as previously found for CH and CN - despite the significantly lower average metallicity of the Small Magellanic Cloud. Analysis of the rotational excitation of C2 yields an estimated kinetic temperature Tk ˜ 25 K and a moderately high total hydrogen density nH ˜ 870 cm-3 - compared to the T01 ˜ 45 K and nH ˜ 85-300 cm-3 obtained from H2. The populations of the lower rotational levels of C3 are consistent with an excitation temperature of about 34 K.
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Howk, J. ChristopherUniversity of Notre Dame
(författare)
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Lehner, NicolasUniversity of Notre Dame
(författare)
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Black, John H,1949Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)jblack
(författare)
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University of ChicagoUniversity of Notre Dame
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Monthly Notices of the Royal Astronomical Society: Oxford University Press (OUP)428:2, s. 1107-11150035-87111365-2966
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