Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...381l..17c&link_type=abstract
Astronomy and Astrophysics, v.381, p.L17-L20 (2002)
Astronomy and Astrophysics
Astrophysics
22
Ism: Abundances, Ism: Molecules, Stars: Formation, Ism: Individual: L1689N
Scientific paper
We present new observations of the D2CO emission towards the small cloud L1689N in the rho Ophiuchus complex. We surveyed five positions, three being a cut across a shock site and two probing the quiescent gas of the molecular cloud. We detected D2CO emission in the first three positions. The measured [D2CO]/[H2CO] is about 3%, whereas it is <=2% in the quiescent gas. We discuss the implications of these new observations, which suggest that the bulk of the D2CO molecules is stored in grain mantles, and removed from the cold storage by the shock at the interface between the outflowing and quiescent gas. We review the predictions of the published models proposed to explain the observed high deuteration of formaldehyde. They fall in two basic schemes: gas phase and grain surface chemistry. None of the reviewed models is able to account for the observed [D2CO]/[H2CO] abundance ratio. A common characteristics shared by the models is apparently that all underestimate the atomic [D]/[H] ratio in the accreting gas.
Boogert Abraham C. A.
Castets Alain
Caux Emmanuel
Ceccarelli Cecilia
Loinard Laurent
No associations
LandOfFree
The puzzling detection of D2CO in the molecular cloud L1689N does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The puzzling detection of D2CO in the molecular cloud L1689N, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The puzzling detection of D2CO in the molecular cloud L1689N will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1085894