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The JCMT Legacy Survey of the Gould Belt: a first look at Orion B with HARP
Authors:J V Buckle  E I Curtis  J F Roberts  G J White  J Hatchell  C Brunt  H M Butner  B Cavanagh  A Chrysostomou  C J Davis  A Duarte-Cabral  M Etxaluze  J Di Francesco  P Friberg  R Friesen  G A Fuller  S Graves  J S Greaves  M R Hogerheijde  D Johnstone  B Matthews  H Matthews  D Nutter  J M C Rawlings  J S Richer  S Sadavoy  R J Simpson  N F H Tothill  Y G Tsamis  S Viti  D Ward-Thompson  J G A Wouterloot  J Yates
Institution:Astrophysics Group, Cavendish Laboratory, J J Thomson Avenue, Cambridge CB3 0HE;Kavli Institute for Cosmology, Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA;Centro de Astrobiología (CSIC/INTA), Ctra de Torrejón a Ajalvir km 4, E-28850 Torrejón de Ardoz, Madrid, Spain;Department of Physics and Astronomy, Open University, Walton Hall, Milton Keynes MK7 6AA;Science and Technology Facilities Council, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX;School of Physics, University of Exeter, Stocker Road, Exeter EX4 4QL;Department of Physics and Astronomy, James Madison University, 901 Carrier Drive, Harrisonburg, VA 22807, USA;Joint Astronomy Center, 660 N. A'Ohoku Place, University Park, Hilo, Hawaii 96720, USA;School of Physics, Astronomy and Mathematics, University of Hertfordshire, College Lane, Hatfield AL10 9AB;Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Oxford Road, Manchester M13 9PL;National Research Council Canada, Herzberg Institute of Astrophysics, 5071 West Saanich Rd, Victoria, BC V9E 2E7, Canada;Department of Physics &Astronomy, University of Victoria, 3800 Finnerty Rd., Victoria, BC V8P 5C2, Canada;Scottish Universities Physics Alliance, Physics &Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS, Fife;Leiden Observatory, Leiden University, PO Box 9513, 2300 RA, Leiden, the Netherlands;National Research Council of Canada, Dominion Radio Astrophysical Observatory, 717 White Lake Rd., Penticton, BC V2A 6J9, Canada;School of Physics &Astronomy, Cardiff University, 5 The Parade, Cardiff CF24 3AA;Department of Physics &Astronomy, University College London, Gower Street, London WC1E 6BT;Instituto de Astrofísica de Andalucía (CSIC), Camino Bajo de Hutor 50, 18008 Granada, Spain
Abstract:The Gould Belt Legacy Survey will survey nearby star-forming regions (within 500 pc), using Heterodyne Array Receiver Programme (HARP), Submillimetre Common-User Bolometer Array 2 and Polarimeter 2 on the James Clerk Maxwell Telescope. This paper describes the initial data obtained using HARP to observe 12CO, 13CO and C18O   J = 3 → 2  towards two regions in Orion B, NGC 2024 and NGC 2071. We describe the physical characteristics of the two clouds, calculating temperatures and opacities utilizing all the three isotopologues. We find good agreement between temperatures calculated from CO and from dust emission in the dense, energetic regions. We determine the mass and energetics of the clouds, and of the high-velocity material seen in 12CO emission, and compare the relative energetics of the high- and low-velocity material in the two clouds. We present a clumpfind analysis of the 13CO condensations. The slope of the condensation mass functions, at the high-mass ends, is similar to the slope of the initial mass function.
Keywords:molecular data  stars: formation  ISM: kinematics and dynamics  submillimetre
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