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HCl absorption toward Sagittarius B2.

J Zmuidzinas1, G A Blake, J Carlstrom

  • 1Division of Physics, Mathematics, and Astronomy, California Institute of Technology, Pasadena 91125, USA.

The Astrophysical Journal
|July 10, 1995
PubMed
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Hydrogen chloride (HCl) was detected in the Sagittarius B2 molecular cloud. This finding helps constrain chlorine depletion factors in interstellar environments.

Area of Science:

  • Astrochemistry
  • Molecular Astrophysics
  • Interstellar Medium Physics

Background:

  • Molecular clouds are crucial sites for star and planet formation.
  • Understanding the chemical composition of these clouds reveals insights into chemical evolution and physical conditions.
  • Hydrogen chloride (HCl) is a key molecule for tracing chlorine abundance and its chemical state in interstellar space.

Purpose of the Study:

  • To detect and characterize the 626 GHz J = 1 --> 0 transition of hydrogen chloride (H35Cl).
  • To determine the abundance and column density of HCl in the Sagittarius B2 molecular cloud.
  • To investigate the chemical state and depletion of gas-phase chlorine in the interstellar medium.

Main Methods:

  • Detection of the 626 GHz J = 1 --> 0 transition of H35Cl in absorption against the dust continuum emission of Sagittarius B2.
Keywords:
NASA Discipline ExobiologyNASA Discipline Number 52-10NASA Program ExobiologyNon-NASA Center

Related Experiment Videos

  • Analysis of the observed line shape, accounting for hyperfine components and velocity profiles.
  • Construction of a detailed radiative transfer model incorporating collisional and radiative excitation, dust interactions, and spatial variations in temperature and density.

    • Main Results:

    • The 626 GHz J = 1 --> 0 transition of H35Cl was successfully detected in absorption.
    • The apparent optical depth was measured to be approximately 1, with a minimum HCl column density of 1.6 x 10^14 cm^-2.
    • A HCl/H2 abundance ratio of approximately 1.1 x 10^-9 was derived from the radiative transfer model.

    Conclusions:

    • The derived HCl abundance provides a direct measure of gas-phase chlorine in the studied region.
    • Comparison with chemical models indicates a significant depletion factor for gas-phase chlorine, ranging from 50 to 180.
    • This study highlights the importance of molecular observations for understanding the chemical processes and elemental abundances in dense interstellar environments.