2006A&A...454L..59H


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.05CEST08:56:34

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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Number of rows : 8

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 [JCC87] IRAS 4A Y*O 03 29 10.49 +31 13 30.8           ~ 596 1
2 [JCC87] IRAS 4 FIR 03 29 10.9 +31 13 26           ~ 465 0
3 [JCC87] IRAS 4B Y*O 03 29 12.058 +31 13 02.05           ~ 553 0
4 V* DM Tau Or* 04 33 48.7335659850 +18 10 09.974471722 14.30 14.82 14.00     M2Ve 510 0
5 LDN 1544 DNe 05 04 16.6 +25 10 48           ~ 680 0
6 NAME [BM89] L1544 cor 05 04 22.5 +25 11 36           ~ 434 1
7 V* TW Hya TT* 11 01 51.9054298616 -34 42 17.031550898   11.94 10.50 10.626 9.18 K6Ve 1532 1
8 LDN 57 DNe 17 22 38.2 -23 49 34           ~ 283 1

    Equat.    Gal    SGal    Ecl

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2020.07.05-08:56:34

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