J/A+A/653/A129 GUAPOS II. Identified transitions of molecules (Colzi+, 2021)
The GUAPOS project II. A comprehensive study of peptide-like bond molecules.
Colzi L., Rivilla V.M., Beltran M.T., Jimenez-Serra I., Mininni C.,
Melosso M., Cesaroni R., Fontani F., Lorenzani A., Sanchez-Monge A.,
Viti S., Schilke P., Testi L., Alonso E.R., Kolesnikova L.
<Astron. Astrophys. 653, A129 (2021)>
=2021A&A...653A.129C 2021A&A...653A.129C (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics ; Radio lines
Keywords: astrochemistry - line: identification - ISM: molecules -
ISM: individual object: G31.41+0.31 - stars: formation
Abstract:
We present an unbiased spectral survey of one of the most chemically
rich hot molecular cores located outside the Galactic Center, in the
high-mass star-forming region G31.41+0.31. In this second paper, we
discuss the detection and relative abundances of the peptide-like bond
molecules: HNCO, HC(O)NH2, CH3NCO, CH3C(O)NH2, CH3NHCHO,
CH3CH2NCO, NH2C(O)NH2, NH2C(O)CN, and HOCH2C(O)NH2.
Observations were carried out with the ALMA interferometer, covering
all of band 3 (about 32GHz bandwidth) with an angular resolution of
1.2"x1.2" (about 4400aux4400au) and a spectral resolution of about
0.488MHz. The transitions of the nine molecules have been analyzed
with the software MADCUBA to determine the physical parameters of the
emitted gas. The results suggest that all these species are formed on
grain surfaces in early evolutionary stages of molecular clouds, and
that they are subsequently released back to the gas-phase through
thermal desorption or shock-triggered desorption.
Description:
Table of identified transitions of the 5 detected molecules (HNCO,
HC(O)NH2, CH3NCO, CH3C(O)NH2, and CH3NHCHO)in the GUAPOS
survey towards G31.41+0.31. In the table the name of the molecule with
its vibrational state, the frequency of the rotational transition, the
base 10 logarithm of the integrated intensity at 300K, the energy of
the upper level and the optical depth of the transition derived from
the LTE fit are given.
Objects:
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RA (2000) DE Designation(s)
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18 47 34.49 -01 12 40.3 G31.41+0.31 = IRAS 18449-0115
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablec1.dat 104 202 Identified transitions of peptide-like molecules
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Byte-by-byte Description of file: tablec1.dat
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Bytes Format Units Label Explanations
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1- 20 A20 --- Mol Molecule and vibrational state for which the
transitions are listed
22- 32 F11.4 MHz RFreq Rest frequency
37- 47 A11 --- Transu Upper rotational transition (1)
48- 63 A16 --- Transl Lower rotational transition (1)
64- 70 F7.4 nm+2.MHz logI Base 10 logarithm of the integrated intensity
at 300K
75- 82 F8.3 K Eu Upper state energy Eu
87- 93 F7.5 --- tau Optical depth at the center of the line
98-104 F7.5 --- e_tau Error on the optical depth
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Note (1): For all the molecules the levels are indicated as (J, K_a, K_c),
except for HN13CO for which also the hyperfine state is indicated,
(J, K_a, K_c, F), and for CH_3NCO and ^13CH3NCO for which the levels are
labelled as (J, K_a, K_c, m). The quantum numbers m or K_a may carry a sign;
in the latter case, K_c is not reported and we indicated it as K_c="-".
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Acknowledgements:
Laura Colzi, lcolzi(at)cab.inta-csic.es
(End) Laura Colzi [CAB, Spain], Patricia Vannier [CDS] 29-Jul-2021