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Related Experiment Videos

Nitrogen sulfide in giant molecular clouds.

D McGonagle1, W M Irvine

  • 1Large Millimeter Telescope Observatory, University of Massachusetts, Amherst 01003, USA. mcg@fcrao1.phast.umass.edu

The Astrophysical Journal
|March 10, 1997
PubMed
Summary
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Nitrogen sulfide (NS) was detected in most giant molecular clouds (GMCs) studied, indicating its presence in massive star formation regions. Its abundance in the Orion molecular cloud suggests current models may underestimate its role in interstellar chemistry.

Area of Science:

  • Astrochemistry
  • Radio Astronomy
  • Interstellar Medium

Background:

  • Nitrogen sulfide (NS) is a molecule of interest in understanding interstellar chemistry.
  • Regions of massive star formation are key sites for complex molecule formation.
  • Previous models of gas-phase chemistry in quiescent clouds provided limited data on NS abundance.

Purpose of the Study:

  • To survey for the presence of nitrogen sulfide (NS) in regions of massive star formation.
  • To determine the abundance and distribution of NS in giant molecular clouds (GMCs).
  • To investigate the implications of NS detection for interstellar chemistry models.

Main Methods:

  • Observed NS using its rotational transitions at 69, 115, and 161 GHz.
  • Analyzed hyperfine component relative line strengths to assess optical depth.
Keywords:
NASA Discipline ExobiologyNon-NASA Center

Related Experiment Videos

  • Mapped the spatial distribution of NS emission in the Orion molecular cloud.

    • Main Results:

    • NS was detected in 12 out of 14 observed GMCs, confirming its widespread presence.
    • NS emission is generally optically thin, with a fractional abundance of (1-4) x 10(-10) in Orion.
    • NS distribution in OMC-1 resembles that of SO and CH3OH; methylene and SO+ were also identified.

    Conclusions:

    • The observed abundance of NS is higher than predicted by some gas-phase chemistry models for quiescent clouds.
    • NS likely plays a significant role in the chemical evolution of massive star-forming regions.
    • Further research is needed to refine models and understand the formation pathways of NS in these environments.