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First detection of NH3 (1(0) -> 0(0)) from a low mass cloud core - On the low ammonia abundance of the rho Oph A core

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Published copy (DOI)


  • R Liseau
  • B Larsson
  • A Brandeker
  • P Bergman
  • J H Black
  • R Booth
  • V Buat
  • C Curry
  • P Encrenaz
  • E Falgarone
  • P Feldman
  • M Fich
  • H Floren
  • U Frisk
  • M Gerin
  • E Gregersen
  • J Harju
  • T Hasegawa
  • A Hjalmarson
  • L Johansson
  • S Kwok
  • A Lecacheux
  • T Liljestrom
  • K Mattila
  • G Mitchell
  • L Nordh
  • M Olberg
  • G Olofsson
  • L Pagani
  • R Plume
  • I Ristorcelli
  • A Sandqvist
  • F von Scheele
  • G S Serra
  • N Tothill
  • K Volk
  • C Wilson


Publication details

JournalAstronomy & Astrophysics
DatePublished - May 2003
Issue number3
Number of pages4
Pages (from-to)L73-L76
Original languageEnglish


Odin has successfully observed the molecular core rho Oph A in the 572.5 GHz rotational ground state line of ammonia, NH3 (J(K) = 1(0) --> 0(0)). The interpretation of this result makes use of complementary molecular line data obtained from the ground ((CO)-O-17 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 (CO)-O-17 and CH3OH, ammonia is found to be significantly underabundant with respect to typical dense core values, viz. X(NH3) = 8 X 10(-10).

    Research areas

  • ISM : individual objects : rho OphA, clouds, molecules, stars : formation, INTERSTELLAR AMMONIA, ROTATIONAL-EXCITATION, METHANOL, SUBMILLIMETER, TRANSITIONS, HELIUM, STATE

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