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Methanol in dark clouds.

P Friberg1, S C Madden, A Hjalmarson

  • 1Onsala Space Observatory, Sweden.

Astronomy and Astrophysics
|January 1, 1988
PubMed
Summary
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Methanol (CH3OH) emission was observed in dark cold clouds, revealing complex structures and non-LTE excitation. This study provides new insights into interstellar chemistry and molecular excitation in these environments.

Area of Science:

  • Astrochemistry
  • Interstellar Medium Physics
  • Molecular Spectroscopy

Background:

  • Dark cold clouds are crucial sites for star formation.
  • Understanding molecular abundances and excitation conditions is key to deciphering cloud chemistry.
  • Methanol (CH3OH) is a significant molecule in interstellar chemistry.

Purpose of the Study:

  • To report the first observations of specific methanol (CH3OH) spectral lines in dark cold clouds.
  • To investigate the spatial extent and velocity structure of CH3OH emission.
  • To determine methanol abundance and compare it with other molecules like formaldehyde (H2CO) and acetaldehyde (CH3CHO).

Main Methods:

  • Radioastronomical observations targeting specific CH3OH transitions.
  • Analysis of emission line profiles to determine velocity structure and excitation conditions.
Keywords:
NASA Discipline ExobiologyNASA Discipline Number 52-10NASA Program ExobiologyNon-NASA Center

Related Experiment Videos

  • Non-Local Thermodynamic Equilibrium (non-LTE) excitation modeling.

    • Main Results:

    • Detection of 2(0) - 1(0)A+, E, 2(-1) - 1(-1) E, and 1(0) - 0(0)A+ methanol lines in TMC1, L134N, and B335.
    • Extended CH3OH emission with complex velocity structure observed.
    • Evidence of non-LTE excitation in TMC1.
    • Methanol column densities estimated at ~10^13 cm^-2.
    • Methanol is ~10 times more abundant than acetaldehyde (CH3CHO).
    • Upper limit for dimethyl ether in L134N determined.

    Conclusions:

    • Methanol is an important tracer of physical and chemical conditions in dark cold clouds.
    • The observed non-LTE excitation suggests specific physical conditions influencing molecular excitation.
    • Accurate rest frequency for the 2(0) - 1(0) A+ E methanol line determined as 96741.39(0.01) MHz.