2004A&A...416..165R


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.05CET12:13:38

2004A&A...416..165R - Astronomy and Astrophysics, volume 416, 165-169 (2004/3-2)

Tentative identification of urea and formamide in ISO-SWS infrared spectra of interstellar ices.

RAUNIER S., CHIAVASSA T., DUVERNAY F., BORGET F., AYCARD J.P., DARTOIS E. and D'HENDECOURT L.

Abstract (from CDS):

Laboratory experiments involving vacuum ultraviolet (VUV) irradiation of solid isocyanic acid (HNCO) at 10K, followed by infrared spectroscopy (FTIR), are used to interpret the complex spectra associated with Interstellar Medium (ISM) dust grains, particularly the spectra associated with the icy phase observed toward dense molecular clouds. The comparison of the infrared spectra of the photolysis products with spectra recorded from the protostellar source NGC 7538 IRS9 shows that the ``unexplained" 1700/cm feature can be attributed to the contribution of several species H2CO (formaldehyde), HCONH2 (formamide) and H2NCONH2 (urea) mixed with H2O as the main contributor. Urea, formaldehyde and NH4+OCN (ammonium cyanate) may also contribute to a band at 1470/cm, widely observed in many protostellar infrared sources and which remains up to now poorly explained in numerous ISO-SWS spectra. Isocyanic acid could be a precursor of formamide and urea in interstellar ices.

Abstract Copyright:

Journal keyword(s): stars: individual: NGC 7538 IRS9 - methods: laboratory - infrared: ISM

Simbad objects: 2

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Number of rows : 2

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 W 33a Y*O 18 14 39.0 -17 52 03           ~ 593 0
2 IRAS 23118+6110 Y*O 23 14 01.63 +61 27 20.2           ~ 349 0

    Equat.    Gal    SGal    Ecl

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2021.03.05-12:13:38

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