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+
, 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-H2
at 372GHz with APEX. The (110
) transition of H2
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
, but only upper limits were obtained towards other locations which either have elevated temperatures or contain a newly born star. The H2
detection towards OriB9
is the first one in a massive star-forming region. The fractional ortho-H2
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 H2
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, H2
may therefore be used to put contraints on the timescales related to massive star formation.
ISM: clouds - ISM: molecules - ISM: individual objects: IRAS 05405-0117 - stars: formation - radio lines: ISM - telescopes
Table 1: [HHL2006] OriB9 W (Nos OriB9 E, OriB9 N).
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