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First detection of NH3 (10 -> 00) from a low mass cloud core. On the low ammonia abundance of the rho Oph A core
Stockholm University, Faculty of Science, Department of Astronomy.
Stockholm University, Faculty of Science, Department of Astronomy.
Stockholm University, Faculty of Science, Department of Astronomy.
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2003 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 402, L73-L76 p.Article in journal (Refereed) Published
Abstract [en]

Odin has successfully observed the molecular core rho Oph A in the 572.5 GHz rotational ground state line of ammonia, NH3 (JK = 10 -> 00). The interpretation of this result makes use of complementary molecular line data obtained from the ground (C17O and CH3OH) as part of the Odin preparatory work. Comparison of these observations with theoretical model calculations of line excitation and transfer yields a quite ordinary abundance of methanol, X(CH3OH)= 3 x 10-9. Unless NH3 is not entirely segregated from C17O and CH3OH, ammonia is found to be significantly underabundant with respect to typical dense core values, viz. X(NH3) = 8 x 10-10. Based on observations with Odin, a Swedish-led satellite project funded jointly by the Swedish National Space Board (SNSB), the Canadian Space Agency (CSA), the National Technology Agency of Finland (Tekes) and Centre National d'Études Spatiales (CNES). The Swedish Space Corporation has been the industrial prime contractor. and based on observations collected with the Swedish ESO Submillimeter Telescope, SEST, in La Silla, Chile.

Place, publisher, year, edition, pages
2003. Vol. 402, L73-L76 p.
Keyword [en]
ISM: individual objects: rho Oph A, clouds, molecules, stars: formation
Research subject
URN: urn:nbn:se:su:diva-30917DOI: 10.1051/0004-6361:20030343OAI: diva2:274759
Available from: 2009-10-31 Created: 2009-10-30 Last updated: 2011-02-15Bibliographically approved

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Liseau, R.Larsson, B.Brandeker, A.Florén, H.Nordh, L.Olofsson, G.Sandqvist, Aa.
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