2016A&A...586A.110S


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.06CEST21:35:02

2016A&A...586A.110S - Astronomy and Astrophysics, volume 586A, 110-110 (2016/2-1)

A study of the C3H2 isomers and isotopologues: first interstellar detection of HDCCC.

SPEZZANO S., GUPTA H., BRUENKEN S., GOTTLIEB C.A., CASELLI P., MENTEN K.M., MUELLER H.S.P., BIZZOCCHI L., SCHILKE P., McCARTHY M.C. and SCHLEMMER S.

Abstract (from CDS):

The partially deuterated linear isomer HDCCC of the ubiquitous cyclic carbene (c-C3H2) was observed in the starless cores TMC-1C and L1544 at 96.9GHz, and a confirming line was observed in TMC-1 at 19.38GHz. To aid the identification in these narrow line sources, four centimetre-wave rotational transitions (two in the previously reported Ka=0 ladder and two new ones in the Ka=1 ladder) and 23 transitions in the millimetre band between 96 and 272GHz were measured in high-resolution laboratory spectra. Ten spectroscopic constants in a standard asymmetric top Hamiltonian allow the main transitions of astronomical interest in the Ka≤3 rotational ladders to be calculated to within 0.1km/s in radial velocity up to 400GHz. Conclusive identification of the two astronomical lines of HDCCC was provided by the VLSR, which is the same as for the normal isotopic species (H2CCC) in the three narrow line sources. In these sources, deuterium fractionation in singly substituted H2CCC (HDCCC/H2CCC∼4-19%) is comparable to that in c-C3H2 (c-C3H2/c-C3HD∼5-17%) and similarly in doubly deuterated c-C3H2 (c-C3D2/c-C3HD∼3-17%), implying that the efficiency of the deuteration processes in the H2CCC and c-C3H2 isomers are comparable in dark clouds.

Abstract Copyright:

Journal keyword(s): astrochemistry - line: identification - ISM: molecules - ISM: clouds

Simbad objects: 12

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Number of rows : 12

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 1527 DNe 04 39 53 +25 45.0           ~ 495 0
2 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3478 0
3 JCMTSF J044115.2+254932 smm 04 41 15.2 +25 49 32           ~ 3 0
4 Barnard 220 DNe 04 41 38.8 +26 00 42           ~ 121 0
5 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1359 0
6 LDN 1544 DNe 05 04 16.6 +25 10 48           ~ 680 0
7 NAME Orion Bright Bar reg 05 35 22.30 -05 24 33.0           ~ 716 0
8 NAME Horsehead Nebula DNe 05 40 59.0 -02 27 30           ~ 445 0
9 IRC +10216 C* 09 47 57.40632 +13 16 43.5648     10.96     C9,5e 2133 0
10 [PCW91] Ced 110 IRS 10 Y*O 11 06 33.38 -77 23 34.6           ~ 58 1
11 NAME Lupus I Cld 15 43 02.1 -34 09 06           ~ 224 0
12 LDN 483 DNe 18 17 35 -04 39.8           ~ 209 0

    Equat.    Gal    SGal    Ecl

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2020.07.06-21:35:02

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