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The L1457 molecular/atomic cloud complex: H I and CO maps.

G H Moriarty-Schieven1, B G Andersson, P G Wannier

  • 1Dominion Radio Astrophysical Observatory, National Research Council, Penticton, Canada. gms@jach.hawaii.edu

The Astrophysical Journal
|February 1, 1997
PubMed
Summary

The L1457 molecular cloud complex, located near the local hot bubble, contains significant atomic and molecular gas. Its structure suggests recent compression at the southern end, revealing intricate filamentary atomic gas.

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Area of Science:

  • Astronomy and Astrophysics
  • Interstellar Medium Studies

Background:

  • L1457 is the nearest known molecular cloud, situated 65 parsecs away.
  • It is located near the edge of the local hot bubble and far from the Galactic plane (b ≈ -34°).

Purpose of the Study:

  • To map and analyze the atomic and molecular gas structure of the L1457 complex.
  • To investigate the relationship between atomic hydrogen (H I) and molecular hydrogen (H2) within the complex.

Main Methods:

  • Mapping an 8°x8° region in H I 21 cm emission at 35' resolution.
  • Detailed mapping of a 3°x5° region in H I 21 cm emission at 2' resolution.
  • Mapping a 2°x4° region in 12CO J=1-0 emission at 2' resolution.

Main Results:

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  • An extended atomic gas component, comparable in mass to the molecular gas, is associated with the complex.
  • Small-scale H I structures include narrow filaments (<0.2 pc width, 1°-4° length).
  • A thin atomic halo surrounds CO emission at some velocities, potentially disturbed by the local hot bubble.

    • Conclusions:

    • The L1457 atomic/molecular complex spans approximately 5°x3° with a southern extension.
    • The complex is dominated by H I in the north and H2 in the south, with roughly half its mass being molecular.
    • The complex's structure indicates recent compression at its southern end.