Internal structure of a cold dark molecular cloud inferred from the extinction of background starlight View Full Text


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Article Info

DATE

2001-01

AUTHORS

João F. Alves, Charles J. Lada, Elizabeth A. Lada

ABSTRACT

Stars and planets form within dark molecular clouds, but little is understood about the internal structure of these clouds, and consequently about the initial conditions that give rise to star and planet formation. The clouds are primarily composed of molecular hydrogen, which is virtually inaccessible to direct observation. But the clouds also contain dust, which is well mixed with the gas and which has well understood effects on the transmission of light. Here we use sensitive near-infrared measurements of the light from background stars as it is absorbed and scattered by trace amounts of dust to probe the internal structure of the dark cloud Barnard 68 with unprecedented detail. We find the cloud's density structure to be very well described by the equations for a pressure-confined, self-gravitating isothermal sphere that is critically stable according to the Bonnor–Ebert criteria1,2. As a result we can precisely specify the physical conditions inside a dark cloud on the verge of collapse to form a star. More... »

PAGES

159-161

References to SciGraph publications

  • 1999. The Dynamical Structure and Evolution of Giant Molecular Clouds in THE ORIGIN OF STARS AND PLANETARY SYSTEMS
  • 1999. Magnetic Fields and Star Formation: A Theory Reaching Adulthood in THE ORIGIN OF STARS AND PLANETARY SYSTEMS
  • 1965-11. Structure of the Radio Continuum Background at High Galactic Latitudes in NATURE
  • 1999. Low-Mass Star Formation: Theory in THE ORIGIN OF STARS AND PLANETARY SYSTEMS
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    URI

    http://scigraph.springernature.com/pub.10.1038/35051509

    DOI

    http://dx.doi.org/10.1038/35051509

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1043337890

    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/11196632


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