Harold Martin Butner

The JCMT Legacy Survey of the Gould Belt: a first look at Serpens with HARP: GBS: first look at Serpens

The Gould Belt Legacy Survey will survey nearby star-forming regions (within 500 pc), using HARP (Heterodyne Array Receiver Programme), SCUBA-2 (Submillimetre Common- User Bolometer Array 2) and POL-2 (Polarimeter 2) on the James Clerk Maxwell Telescope (JCMT). 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 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.

SONS: The JCMT legacy survey of debris discs in the submillimetre

During the period of these observations the James Clerk Maxwell Telescope was operated by the Joint Astronomy Centre on behalf of the Science and Technology Facilities Council of the United Kingdom, the National Research Council of Canada and the Netherlands Organisation for Pure Research. Additional funds for the construction of SCUBA-2 were provided by the Canada Foundation for Innovation. MCW acknowledges the support of the European Union through ERC grant number 279973. GMK is supported by the Royal Society as a Royal Society University Research Fellow. MB acknowledges support from a FONDECYT Postdoctoral Fellowship, project no. 3140479 and the Deutsche Forschungsgemeinschaft through project Kr 2164/15-1. JPM is supported by a UNSW Vice Chancellor’s postdoctoral research fellowship. The work of OP is supported by the Royal Society through a Royal Society Dorothy Hodgkin fellowship. GJW gratefully acknowledges support from the Leverhulme Trust.

Abundance of DCO+ in Nearby Molecular Clouds

DCO+ is one of the most common deuterated molecules in cold (TK ∼ 10 K) molecular cloud cores such as TMC-1. We report the results of a survey for DCO+ and H13CO+ emission regions among a sample of low mass cloud cores. We compare the derived DCO+ /HCO+ ratio (0.046±0.014) with current chemistry models for deuterium fractionation.