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Nitrogen sulfide in quiescent dark clouds.

D McGonagle1, W M Irvine, M Ohishi

  • 1Five College Radio Astronomy Observatory, University of Massachusetts at Amherst 01003, USA.

The Astrophysical Journal
|February 20, 1994
PubMed
Summary

Astronomers detected interstellar nitrogen sulfide (NS) in cold dark clouds, specifically in TMC-1 and L134N. The observed abundances were higher than predicted by current models, offering new insights into astrochemistry.

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Area of Science:

  • Astrochemistry
  • Radio Astronomy
  • Interstellar Medium

Background:

  • Cold dark clouds are crucial sites for star and planet formation.
  • Understanding the chemical complexity of these clouds is key to unraveling the origins of molecules in space.

Purpose of the Study:

  • To report the first detection of nitrogen sulfide (NS) in interstellar space.
  • To investigate the abundance and distribution of NS in cold dark clouds.

Main Methods:

  • Observation of specific rotational transitions (J = 3/2 --> 1/2 and J = 5/2 --> 3/2) of NS.
  • Utilizing radio telescopes to detect spectral lines in TMC-1 and L134N.

Main Results:

  • First detection of interstellar nitrogen sulfide (NS) in cold dark clouds (TMC-1 and L134N).
  • Inferred column densities of NNS approximately 8 x 10^12 cm^-2 in TMC-1 and 3 x 10^12 cm^-2 in L134N.
  • Measured fractional abundances (fNS) of approximately 8 x 10^-10 and 6 x 10^-10 in TMC-1 and L134N, respectively.
  • NS emission was found to be extended in both observed clouds.

Conclusions:

  • The observed abundances of NS are significantly higher than predicted by current gas-phase ion-molecule models.
  • The detection of NS contributes to the growing inventory of molecules in interstellar clouds.
  • Further theoretical and observational studies are needed to explain the formation pathways of NS in cold dark clouds.
Keywords:
NASA Discipline ExobiologyNon-NASA Center

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