The methanol lines and hot core of OMC2-FIR4, an intermediate-mass protostar, with Herschel-HIFI - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2010

The methanol lines and hot core of OMC2-FIR4, an intermediate-mass protostar, with Herschel-HIFI

C. Dominik
S. Maret
E. Caux
A. Fuente
P. Caselli
J. Cernicharo
A. Coutens
P. F. Goldsmith
  • Fonction : Auteur
P. Hennebelle
T. Henning
B. Lefloch
B. Nisini
Justin Pearson
  • Fonction : Auteur
  • PersonId : 829524
P. Schilke
M. H. D. van Der Wiel
  • Fonction : Auteur
R. Güsten
  • Fonction : Auteur
S. Philipp
  • Fonction : Auteur

Résumé

In contrast with numerous studies on the physical and chemical structure of low- and high-mass protostars, much less is known about their intermediate-mass counterparts, a class of objects that could help to elucidate the mechanisms of star formation on both ends of the mass range. We present the first results from a rich HIFI spectral dataset on an intermediate-mass protostar, OMC2-FIR4, obtained in the CHESS (Chemical HErschel SurveyS of star forming regions) key programme. The more than 100 methanol lines detected between 554 and 961 GHz cover a range in upper level energy of 40 to 540 K. Our physical interpretation focusses on the hot core, but likely the cold envelope and shocked regions also play a role in reality, because an analysis of the line profiles suggests the presence of multiple emission components. An upper limit of 10^-6 is placed on the methanol abundance in the hot core, using a population diagram, large-scale source model and other considerations. This value is consistent with abundances previously seen in low-mass hot cores. Furthermore, the highest energy lines at the highest frequencies display asymmetric profiles, which may arise from infall around the hot core.

Dates et versions

hal-00520749 , version 1 (24-09-2010)

Identifiants

Citer

M. Kama, C. Dominik, S. Maret, F. van Der Tak, E. Caux, et al.. The methanol lines and hot core of OMC2-FIR4, an intermediate-mass protostar, with Herschel-HIFI. Astronomy and Astrophysics - A&A, 2010, 521, pp.id.L39. ⟨10.1051/0004-6361/201015118⟩. ⟨hal-00520749⟩
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