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This study surveyed chemistry in distant high-mass star-forming regions using the Atacama Compact Array. It revealed chemical diversity and spatial variability in methanol emission, paving the way for future high-resolution studies.

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Area of Science:

  • Astronomy
  • Astrochemistry
  • Galactic Science

Background:

  • Understanding star formation chemistry is limited, especially for high-mass regions due to distance and resolution constraints.
  • Previous observations of distant, high-mass star-forming regions lacked sufficient spatial resolution to study chemical complexity.
  • New facilities like ALMA and JWST offer unprecedented resolution and sensitivity for these distant objects.

Purpose of the Study:

  • To conduct a pilot survey of chemical complexity in distant high-mass star-forming regions.
  • To investigate the spatial chemical variability within giant molecular clouds.
  • To lay the groundwork for future high-resolution studies of gas-phase chemistry.

Main Methods:

  • Utilized the Atacama Compact Array (a subset of ALMA) for a pilot survey.
  • Observed 11 giant molecular clouds in the galactic molecular ring (4-8 kpc).
  • Analyzed molecular emission, including methanol, at a resolution of approximately 5 arcseconds.

Main Results:

  • Observed molecular emission regions, many associated with young stellar objects, showing diverse chemical complexity.
  • Detected well-fit methanol emission in nine of the target clouds.
  • Provided initial insights into spatial chemical variations within these distant clouds.

Conclusions:

  • The pilot survey demonstrates the feasibility of studying chemical diversity in distant star-forming regions with current facilities.
  • Results highlight significant spatial chemical variability within giant molecular clouds.
  • This work establishes a foundation for advanced high angular resolution studies of astrochemistry using the full ALMA capabilities.