SIMBAD references

2010ApJ...713L..50C - Astrophys. J., 713, L50-L54 (2010/April-2)

Deuterium fractionation as an evolutionary probe in the infrared dark cloud G28.34+0.06.

CHEN H.-R., LIU S.-Y., SU Y.-N. and ZHANG Q.

Abstract (from CDS):

We have observed the J = 3 - 2 transition of N2H+ and N2D+ to investigate the trend of deuterium fractionation with evolutionary stage in three selected regions in the infrared dark cloud (IRDC) G28.34+0.06 with the Submillimeter Telescope and the Submillimeter Array. A comprehensible enhancement of roughly 3 orders of magnitude in deuterium fractionation over the local interstellar D/H ratio is observed in all sources. In particular, our sample of massive star-forming cores in G28.34+0.06 shows a moderate decreasing trend over a factor of 3 in the N(N2D+)/N(N2H+) ratio with evolutionary stage, a behavior resembling that previously found in low-mass protostellar cores. This suggests a possible extension for the use of the N(N2D+)/N(N2H+) ratio as an evolutionary tracer to high-mass protostellar candidates. In the most evolved core, MM1, the N2H+(3-2) emission appears to avoid the warm region traced by dust continuum emission and emission of 13CO sublimated from grain mantles, indicating an instant release of gas-phase CO. The majority of the N2H+ and N2D+ emission is associated with extended structures larger than 8'' (∼0.2 pc).

Abstract Copyright:

Journal keyword(s): ISM: abundances - ISM: clouds - ISM: individual objects: G28.34+0.06 - stars: formation

Simbad objects: 8

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