The CARMA-NRO Orion Survey: Core Emergence and Kinematics in the Orion A Cloud

Rowan Smith, et al.

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    We have investigated the formation and kinematics of sub-mm continuum cores in the Orion A molecular cloud. A comparison between sub-mm continuum and near infrared extinction shows a continuum core detection threshold of AV ∼ 5-10 mag. The threshold is similar to the star formation extinction threshold of AV ∼ 7 mag proposed by recent work, suggesting a universal star formation
    extinction threshold among clouds within 500 pc to the Sun. A comparison between the Orion A cloud and a massive infrared dark cloud G28.37+0.07 indicates that Orion A produces more dense gas within the extinction range 15 mag ≤ AV ≤. 60 mag. Using data from the CARMA-NRO Orion Survey, we find that dense cores in the integral-shaped lament (ISF) show sub-sonic core-to-envelope velocity dispersion that is signicantly less than the local envelope line dispersion, similar to what has been found in nearby clouds. Dynamical analysis indicates that the cores are bound to the ISF. An oscillatory core-to-envelope motion is detected along the ISF. Its origin is to be further explored.
    Original languageEnglish
    JournalThe Astrophysical Journal
    Early online date30 Aug 2019
    Publication statusPublished - 2019


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