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arXiv:1908.04488 (astro-ph)
[Submitted on 13 Aug 2019]

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

Authors:Shuo Kong (1), Héctor G. Arce (1), Anneila I. Sargent (2), Steve Mairs (3), Ralf S. Klessen (4,5), John Bally (6), Paolo Padoan (7,8), Rowan J. Smith (9), María José Maureira (1), John M. Carpenter (10), Adam Ginsburg (11), Amelia M. Stutz (12,13), Paul Goldsmith (14), Stefan Meingast (15), Peregrine McGehee (16), Álvaro Sánchez-Monge (17), Sümeyye Suri (17), Jaime E. Pineda (18), João Alves (15,19), Jesse R. Feddersen (1), Jens Kauffmann (20), Peter Schilke (17) ((1) Department of Astronomy, Yale University, New Haven, CT 06511, USA, (2) Cahill Center for Astronomy and Astrophysics, California Institute of Technology, 249-17, Pasadena, CA 91125, USA, (3) East Asian Observatory, 660 N. A'ohoku Place, Hilo, HI 96720, USA, (4) Universität Heidelberg, Zentrum für Astronomie, Albert-Ueberle-Str. 2, D-69120 Heidelberg, Germany, (5) Universität Heidelberg, Interdisziplinäres Zentrum für Wissenschaftliches Rechnen, INF 205, D-69120 Heidelberg, Germany, (6) Department of Astrophysical and Planetary Sciences, University of Colorado, Boulder, CO, USA, (7) Institut de Ciències del Cosmos, Universitat de Barcelona, IEEC-UB, Martí i Franquès 1, E08028 Barcelona, Spain, (8) ICREA, Pg. Lluís Companys 23, E-08010 Barcelona, Spain, (9) Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL, UK, (10) Joint ALMA Observatory, Alonso de Córdova 3107 Vitacura, Santiago, Chile, (11) National Radio Astronomy Observatory, 1003 Lopezville Road, Socorro, NM 87801, USA, (12) Departmento de Astronomía, Facultad de Ciencias Físicas y Matemáticas, Universidad de Concepción, Concepción, Chile, (13) Max-Planck-Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany, (14) Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA, (15) Department of Astrophysics, University of Vienna, Türkenschanzstrasse 17, A-1180 Wien, Austria, (16) Department of Earth and Space Sciences, College of the Canyons, Santa Clarita, CA 91355, USA, (17) I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, D-50937 Köln, Germany, (18) Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse 1, D-85748 Garching, Germany, (19) Radcliffe Institute for Advanced Study, Harvard University, 10 Garden Street, Cambridge, MA 02138, USA, (20) Haystack Observatory, Massachusetts Institute of Technology, 99 Millstone Road, Westford, MA 01886, USA)
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Abstract: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 $A_V\sim$ 5-10 mag. The threshold is similar to the star formation extinction threshold of $A_V\sim$ 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 $\lesssim A_V \lesssim$ 60 mag. Using data from the CARMA-NRO Orion Survey, we find that dense cores in the integral-shaped filament (ISF) show sub-sonic core-to-envelope velocity dispersion that is significantly 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.
Comments: 21 pages, 11 figures, accepted by ApJ, comments welcome this http URL@yale.edu
Subjects: Solar and Stellar Astrophysics (astro-ph.SR); Astrophysics of Galaxies (astro-ph.GA)
Cite as: arXiv:1908.04488 [astro-ph.SR]
  (or arXiv:1908.04488v1 [astro-ph.SR] for this version)
  https://doi.org/10.48550/arXiv.1908.04488
Related DOI: https://doi.org/10.3847/1538-4357/ab311e

Submission history

From: Shuo Kong [view email]
[v1] Tue, 13 Aug 2019 04:55:42 UTC (2,939 KB)
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