Letter to the Editor
Highly deuterated pre-stellar cores in a high-mass star formation region*
INAF - Istituto di Radioastronomia, via Gobetti 101, 40129 Bologna, Italy e-mail: firstname.lastname@example.org
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
Accepted: 26 November 2007
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 ∼ and ∼9 and diameters of 0.05 and 0.09 pc, respectively. The high deuterium fractionation (∼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