2000A&A...356.1039T


Query : 2000A&A...356.1039T

2000A&A...356.1039T - Astronomy and Astrophysics, volume 356, 1039-1049 (2000/4-3)

Deuterium fractionation in dense ammonia cores.

TINE S., ROUEFF E., FALGARONE E., GERIN M. and PINEAU DES FORETS G.

Abstract (from CDS):

We report observations of several deuterated species in the dark clouds L134N and TMC1, and in particular of NH2D (deuterated ammonia). NH2D has been detected for the first time towards the dense core TMC1-N and very strong emission has been confirmed towards L134N. The deuterium fractionation is very different in these two clouds, with abundance ratio [NH2D]/[NH3]∼0.1 and ∼0.02, [N2D+]/[N2H+]∼0.35 and ∼0.08 and [DCO+]/[HCO+]∼0.18 and ∼0.02, towards L134N and TMC1-N, respectively. For both clouds, but most clearly for L134N, the region of high deuterium fractionation is more localized and much more compact than the high column density region traced by C18O and C17O emission. We compare the observed deuterium fractionation with steady-state chemical models and we find that a better match is obtained when C and O are heavily depleted from the gas phase.

Abstract Copyright:

Journal keyword(s): ISM: individual objects: L134N - ISM: individual objects: TMC 1 - ISM: molecules

Nomenclature: TMC 1N N=1.

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 TMC-1N MoC 04 41 21.3 +25 48 07           ~ 10 0
2 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1560 0
3 LDN 1544 DNe 05 04 16.6 +25 10 48           ~ 796 0
4 NAME [BM89] L1544 cor 05 04 22.5 +25 11 36           ~ 435 1
5 LDN 183 MoC 15 54 12.2 -02 49 42           ~ 728 1

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2022.12.10-03:33:02

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