2010A&A...516A.105M


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.12CEST17:57:57

2010A&A...516A.105M - Astronomy and Astrophysics, volume 516, A105-105 (2010/6-3)

The puzzling behavior of HNCO isomers in molecular clouds.

MARCELINO N., BRUENKEN S., CERNICHARO J., QUAN D., ROUEFF E., HERBST E. and THADDEUS P.

Abstract (from CDS):

Isocyanic acid (HNCO) has been observed in different physical environments in the interstellar medium (ISM) and in external galaxies. HNCO has several metastable isomers with a ground electronic singlet state: HOCN, HCNO, and HONC. The recent detection of fulminic acid (HCNO) in prestellar and protostellar cores and cyanic acid (HOCN) in warm molecular sources (e.g. hot cores) in the Galactic center proves that these species could also be common constituents of the ISM. To shed some light on the possible formation pathways of these species, we searched for HCNO in the sources where HOCN has been previously detected and vice versa. We have also included the low-mass protostar IRAS 16293-2422, where HNCO is found to be prominent. Using the new EMIR receivers at the IRAM 30-m telescope, we performed deep searches for three rotational transitions of HOCN and four of HCNO. We report the detection of HOCN in four sources - three dense cores and the lukewarm corino L1527 - where HCNO has been previously observed. HOCN is tentatively detected toward the protostellar binary IRAS 16293-2422. However, HCNO has been detected neither in this source nor in the sources of the Galactic center where HOCN has been previously reported. The derived abundance ratios HCNO/HOCN are close to unity in quiescent clouds, while they are less than 0.01-0.1 in warm clouds. We attempt to explain these results by using both gas-phase and gas-grain chemical models.

Abstract Copyright:

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

Simbad objects: 14

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Number of rows : 14

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 [HKM99] B1-b cor 03 33 20.32 +31 07 21.5           ~ 159 0
2 LDN 1527 DNe 04 39 53 +25 45.0           ~ 501 0
3 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1363 0
4 LDN 1544 DNe 05 04 16.6 +25 10 48           ~ 690 0
5 NAME [BM89] L1544 cor 05 04 22.5 +25 11 36           ~ 434 1
6 NAME Orion Core ? 05 35 14.5 -05 22 30           ~ 175 0
7 LDN 183 MoC 15 54 12.2 -02 49 42           ~ 683 1
8 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1042 1
9 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11619 0
10 NAME Sgr B2N Mas 17 47 20.0 -28 22 40           ~ 31 1
11 NAME Sgr B2M Mas 17 47 20.13 -28 23 06.1           ~ 35 1
12 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 1921 1
13 NAME Sgr B2 (South) HII 17 47 20.430 -28 23 45.06           ~ 85 0
14 NAME Sgr B2 (OH) MoC 17 47 20.8 -28 23 32           ~ 80 0

    Equat.    Gal    SGal    Ecl

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2020.08.12-17:57:57

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