2016A&A...592A..68C


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.18CEST07:00:50

2016A&A...592A..68C - Astronomy and Astrophysics, volume 592A, 68-68 (2016/8-1)

Negligible photodesorption of methanol ice and active photon-induced desorption of its irradiation products.

CRUZ-DIAZ G.A., MARTIN-DOMENECH R., MUNOZ CARO G.M. and CHEN Y.-J.

Abstract (from CDS):

Context. Methanol is a common component of interstellar and circumstellar ice mantles and is often used as an evolution indicator in star-forming regions. The observations of gas-phase methanol in the interiors of dense molecular clouds at temperatures as low as 10K suggest that non-thermal ice desorption must be active. Ice photodesorption has been proposed to explain the abundances of gas-phase molecules toward the coldest regions.
Aims. Laboratory experiments were performed to investigate the potential photodesorption of methanol toward the coldest regions.
Methods. Solid methanol was deposited at 8K and UV-irradiated at various temperatures starting from 8K. The irradiation of the ice was monitored by means of infrared spectroscopy and the molecules in the gas phase were detected using quadrupole mass spectroscopy. Fully deuterated methanol was used for confirmation of the results.
Results. The photodesorption of methanol to the gas phase was not observed in the mass spectra at different irradiation temperatures. We estimate an upper limit of 3x10–5 molecules per incident photon. On the other hand, photon-induced desorption of the main photoproducts was clearly observed.
Conclusions. The negligible photodesorption of methanol could be explained by the ability of UV-photons in the 114-180nm (10.87-6.88eV) range to dissociate this molecule efficiently. Therefore, the presence of gas-phase methanol in the absence of thermal desorption remains unexplained. On the other hand, we find CH4 to desorb from irradiated methanol ice, which was not found to desorb in the pure CH4 ice irradiation experiments.

Abstract Copyright: © ESO, 2016

Journal keyword(s): ultraviolet: ISM - astrochemistry - ISM: molecules - methods: laboratory: molecular - molecular processes

Simbad objects: 1

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Number of rows : 1

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 NAME Orion Bright Bar reg 05 35 22.30 -05 24 33.0           ~ 690 0

    Equat.    Gal    SGal    Ecl

C.D.S. - SIMBAD4 rel 1.7 - 2019.10.18CEST07:00:50

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NAME Orion Bright Bar -- Region defined in the sky
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    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
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ICRS coord. (ep=J2000) :
05 35 22.30 -05 24 33.0 (Optical) [ ] D 2011MNRAS.417..420M
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : coordinates error major axis, minor axis (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
FK4 coord. (ep=B1950 eq=1950) :
05 32 54.87 -05 26 25.9 [ ]
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : coordinates error major axis, minor axis (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
Gal coord. (ep=J2000) :
209.04075 -19.37127 [ ]
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2019.10.18-07:00:51

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