2006A&A...454L..55H


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.09CEST22:15:43

2006A&A...454L..55H - Astronomy and Astrophysics, volume 454, L55-58 (2006/8-1)

Detection of H2D+ in a massive prestellar core in Orion B.

HARJU J., HAIKALA L.K., LEHTINEN K., JUVELA M., MATTILA K., MIETTINEN O., DUMKE M., GUESTEN R. and NYMAN L.-A.

Abstract (from CDS):

The purpose of this study is to examine the prediction that the deuterated H3+ ion, H2D+, can be found exclusively in the coldest regions of molecular cloud cores. This is also a feasibility study for the detection of the ground-state line of ortho-H2D+ at 372GHz with APEX. The (110 ->111) transition of H2D+ at 372GHz was searched towards selected positions in the massive star forming cloud OriB9, in the dark cloud L183, and in the low- to intermediate mass star-forming cloud R CrA. The line was detected in cold, prestellar cores in the regions of OriB9 and L183, but only upper limits were obtained towards other locations which either have elevated temperatures or contain a newly born star. The H2D+ detection towards OriB9 is the first one in a massive star-forming region. The fractional ortho-H2D+ abundances (relative to H2) are estimated to be ∼1x10–10 in two cold cores in OriB9, and 3x10–10 in the cold core of L183. The H2D+ detection in OriB9 shows that also massive star forming regions contain very cold prestellar cores which probably have reached matured chemical composition characterized, e.g., by a high degree of deuterium fractionation. Besides as a tracer of the interior parts of prestellar cores, H2D+ may therefore be used to put contraints on the timescales related to massive star formation.

Abstract Copyright:

Journal keyword(s): ISM: clouds - ISM: molecules - ISM: individual objects: IRAS 05405-0117 - stars: formation - radio lines: ISM - telescopes

Nomenclature: Table 1: [HHL2006] OriB9 W (Nos OriB9 E, OriB9 N).

Simbad objects: 13

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Number of rows : 13

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 LDN 1544 DNe 05 04 16.6 +25 10 48           ~ 680 0
2 NAME [BM89] L1544 cor 05 04 22.5 +25 11 36           ~ 434 1
3 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1164 0
4 NAME Ori B9 Cloud Cld 05 42 30.5 -01 20 33           ~ 17 0
5 IRAS 05405-0117 Y*O 05 43 03.05688 -01 16 29.2404           G3-M4 27 0
6 [HHL2006] OriB9 E smm 05 43 05.2 -01 16 23           ~ 2 0
7 [HHL2006] OriB9 N smm 05 43 05.7 -01 14 41           ~ 4 0
8 LDN 183N DNe 15 54 09.157 -02 49 38.97           ~ 5 0
9 LDN 183S DNe 15 54 09.2 -02 51 39           ~ 7 0
10 LDN 183 MoC 15 54 12.2 -02 49 42           ~ 682 1
11 NAME IRAS 16293E cor 16 32 29.060 -24 29 10.27           ~ 52 1
12 NAME CrA Dark Cloud MoC 19 01 51 -36 58.9           ~ 394 0
13 NAME Coronet Cluster Cl* 19 01 54 -36 57.2           ~ 81 1

    Equat.    Gal    SGal    Ecl

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2020.07.09-22:15:43

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