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Issue A&A
Volume 477, Number 3, January III 2008
Page(s) L45 - L48
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20078973



A&A 477, L45-L48 (2008)
DOI: 10.1051/0004-6361:20078973

Letter

Highly deuterated pre-stellar cores in a high-mass star formation region

F. Fontani1, P. Caselli2, 3, T. L. Bourke4, R. Cesaroni2, and J. Brand1

1  INAF - Istituto di Radioastronomia, via Gobetti 101, 40129 Bologna, Italy
    e-mail: ffontani@ira.inaf.it
2  INAF - Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125 Firenze, Italy
3  School of Physics and Astrophysics, University of Leeds, Leeds LS2 9JT, UK
4  Harvard-Smithsonian Center for Astrophysics, 60 Garden Street MS42, Cambridge, MA 02138, USA

(Received 31 October 2007 / Accepted 26 November 2007)

Abstract
Aims.We have observed the deuterated gas in the high-mass star formation region IRAS 05345+3157 at high-angular resolution, in order to determine the morphology and the nature of this gas.
Methods.We have mapped the N2H+ (1-0) line with the Plateau de Bure Interferometer, and the N2D+ (3-2) and N2H+ (3-2) lines with the Submillimeter Array.
Results.We have detected two condensations in N2D+, with masses of $\sim $2-3 and $\sim $9 $M_\odot$ and diameters of 0.05 and 0.09 pc, respectively. The high deuterium fractionation ($\sim $0.1) and the line parameters of the N2D+ condensations indicate that they are probably low- to intermediate-mass pre-stellar cores, even though other scenarios are possible.


Key words: stars: formation -- radio lines: ISM -- ISM: individual: IRAS 05345+3157 -- ISM: molecules



© ESO 2008


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