2005A&A...438..585R


Query : 2005A&A...438..585R

2005A&A...438..585R - Astronomy and Astrophysics, volume 438, 585-598 (2005/8-1)

Interstellar deuterated ammonia: from NH3 to ND3.

ROUEFF E., LIS D.C., VAN DER TAK F.F.S., GERIN M. and GOLDSMITH P.F.

Abstract (from CDS):

We use spectra and maps of NH2D, ND2H, and ND3, obtained with the CSO, IRAM 30 m and Arecibo telescopes, to study deuteration processes in dense cores. The data include the first detection of the hyperfine structure in ND2H. The emission of NH2D and ND3 does not seem to peak at the positions of the embedded protostars, but instead at offset positions, where outflow interactions may occur. A constant ammonia fractionation ratio in star-forming regions is generally assumed to be consistent with an origin on dust grains. However, in the pre-stellar cores studied here, the fractionation varies significantly when going from NH3 to ND3. We present a steady state model of the gas-phase chemistry for these sources, which includes passive depletion onto dust grains and multiply saturated deuterated species up to five deuterium atoms (e.g. CD5+). The observed column density ratios of all four ammonia isotopologues are reproduced within a factor of 3 for a gas temperature of 10K. We also predict that deuterium fractionation remains significant at temperatures up to about 20K. ND and NHD, which have rotational transitions in the submillimeter domain are predicted to be abundant.

Abstract Copyright:

Journal keyword(s): ISM: molecules - molecular processes - stars: circumstellar matter - stars: formation

CDS comments: 2: QSO B02231+313 not identified.

Simbad objects: 22

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Number of rows : 22
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 [JCC87] IRAS 4A Y*O 03 29 10.49 +31 13 30.8           ~ 640 1
2 [JCC87] IRAS 4 FIR 03 29 10.9 +31 13 26           ~ 473 0
3 NGC 1333 OpC 03 29 11 +31 18.6           ~ 1281 1
4 [JCC87] IRAS 4B Y*O 03 29 12.058 +31 13 02.05           ~ 573 0
5 Barnard 1 MoC 03 33 16.3 +31 07 51           ~ 284 0
6 3C 93.0 BLL 03 43 29.9960909305 +04 57 48.618679638   18.49 18.14     ~ 151 1
7 LDN 1389 MoC 04 04 38 +56 56.2           ~ 83 0
8 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1450 0
9 LDN 1544C PoC 05 04 07 +25 15.3           ~ 3 0
10 LDN 1544 DNe 05 04 16.6 +25 10 48           ~ 740 0
11 NAME [BM89] L1544 cor 05 04 22.5 +25 11 36           ~ 435 1
12 OMC 2 MoC 05 35 27 -05 10.1           ~ 412 1
13 HH 1 HH 05 36 20.8 -06 45 13           ~ 402 1
14 LDN 1630 DNe 05 45.5 -00 59           ~ 361 0
15 NAME Mon OB1 C PoC 06 41 11 +09 29.1           ~ 50 1
16 NAME Mon OB1 G PoC 06 41 12 +09 55.6           ~ 107 0
17 LDN 183 MoC 15 54 12.2 -02 49 42           ~ 710 1
18 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1113 1
19 LDN 1689N DNe 16 32 25.96 -24 28 46.2           ~ 111 0
20 NAME IRAS 16293E cor 16 32 29.060 -24 29 10.27           ~ 55 1
21 LDN 483 DNe 18 17 35 -04 39.8           ~ 237 0
22 SH 2-68 N Y*O 18 29 48.09 +01 16 45.0           ~ 115 1

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2021.09.24-23:38:06

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