SIMBAD references

2006A&A...454L..59H - Astronomy and Astrophysics, volume 454, L59-62 (2006/8-1)

Probable detection of H2D+ in the starless core Barnard 68.

HOGERHEIJDE M.R., CASELLI P., EMPRECHTINGER M., VAN DER TAK F.F.S., ALVES J., BELLOCHE A., GUESTEN R., LUNDGREN A.A., NYMAN L.-A., VOLGENAU N. and WIEDNER M.C.

Abstract (from CDS):

The presence of H2D+ in dense cloud cores underlies ion-molecule reactions that strongly enhance the deuterium fractionation of many molecular species. We determine the H2D+ abundance in one starless core, Barnard 68, that has a particularly well established physical, chemical, and dynamical structure. We observed the ortho-H2D+ ground-state line 110-111, the N2H+ J=4-3 line, and the H13CO+ 4-3 line with the APEX telescope. We report the probable detection of the o-H2D+ line at an intensity Tmb=0.22±0.08 K and exclusively thermal line width, and find only upper limits to the N2H+ 4-3 and H13CO+ 4-3 intensities. Within the uncertainties in the chemical reaction rates and the collisional excitation rates, chemical model calculations and excitation simulations reproduce the observed intensities and that of o-H2D+ in particular.

Abstract Copyright:

Journal keyword(s): ISM: abundances - ISM: individual objects: Barnard 68 - ISM: molecules - submillimeter

Simbad objects: 8

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2021.07.29-15:42:29

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