C.D.S. - SIMBAD4 rel 1.7 - 2020.02.24CET13:43:02

2013ApJ...778L...1G - Astrophys. J., 778, L1 (2013/November-3)

Laboratory measurements and tentative astronomical identification of H2NCO+.


Abstract (from CDS):

The rotational spectrum of H2NCO+, the ground-state isomer of protonated HNCO, has been measured in a molecular beam in the centimeter band with a Fourier transform microwave spectrometer and in a low-pressure laboratory discharge in absorption in the millimeter band. Spectroscopic constants, including the nitrogen-14 hyperfine coupling constant, derived from 30 a-type transitions between 20 and 367 GHz with J ≤ 18 and Ka ≤ 3 allow the principal rotational transitions to be calculated to 1 km/s or better in equivalent radial velocity well into the far IR. Two low-lying rotational transitions of H2NCO+ in the centimeter band (0_0, 0–10, 1_ and 1_1, 0–21, 1_) were tentatively identified in absorption in the PRIMOS spectral line survey of Sgr B2(N) with the Green Bank Telescope. The lines of H2NCO+ arise in a region of the Sgr B2(N) halo whose density is low (n < 1x104/cm3). The derived column density of (6-14)x1011/cm2 implies that the fractional abundance is ∼10–12. Owing to the ubiquity of HNCO in galactic molecular clouds, H2NCO+ is a good candidate for detection in sources spanning a wide range of physical conditions.

Abstract Copyright:

Journal keyword(s): ISM: molecules

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1337 0
2 NAME Sgr B2 (North) Rad 17 47 20.2 -28 22 21           ~ 504 1
3 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 1879 1

    Equat.    Gal    SGal    Ecl

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