The N2D+/N2H+ ratio as an evolutionary tracer of Class 0 protostars

Details The N2D+/N2H+ ratio as an evolutionary tracer of Class 0 protostars The N2D+/N2H+ ratio as an evolutionary tracer of Class 0 protostars

2008-09-22

arxiv.org/abs/0809.3759v1

Astronomy and Astrophysics

Astrophysics

19 pages, 12 figures, accepted by A&A

Scientific paper

10.1051/0004-6361:200810324

Deuterated ions are abundant in cold (T=10 K), dense (n=10^5 cm^-3) regions, in which CO is frozen out onto dust grains. In such environments, the deuterium fractionation of such ions can exceed the elemental abundance ratio of D/H by a factor of 10^4. In this paper we use the deuterium fractionation to investigate the evolutionary state of Class 0 protostars. In a sample of 20 protostellar objects, we found a clear correlation between the N2D+/N2H+ ratio and evolutionary tracers. As expected, the coolest, i.e. the youngest, objects show the largest deuterium fractionation. Furthermore, we find that sources with a high N2D+/N2H+ ratio show clear indication for infall.

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