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Molecular Line Emission Towards High-Mass Clumps: The MALT90 Catalogue

Rathborne, J.M., Whitaker, J.S., Jackson, J.M., Foster, J.B., Contreras, Y., Stephens, I.W., Gúzman, A.E., Longmore, S.N., Sanhueza, P., Schuller, F., and others. (2016) Molecular Line Emission Towards High-Mass Clumps: The MALT90 Catalogue. Publications of the Astronomical Society of Australia, 33 . e030. ISSN 1323-3580. E-ISSN 1448-6083. (doi:10.1017/pasa.2016.23) (Access to this publication is currently restricted. You may be able to access a copy if URLs are provided)

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Abstract

The Millimetre Astronomy Legacy Team 90 GHz survey aims to characterise the physical and chemical evolution of high-mass clumps. Recently completed, it mapped 90 GHz line emission towards 3 246 high-mass clumps identified from the ATLASGAL 870 ?m Galactic plane survey. By utilising the broad frequency coverage of the Mopra telescope’s spectrometer, maps in 16 different emission lines were simultaneously obtained. Here, we describe the first catalogue of the detected line emission, generated by Gaussian profile fitting to spectra extracted towards each clumps’ 870 ?m dust continuum peak. Synthetic spectra show that the catalogue has a completeness of > 95%, a probability of a false-positive detection of < 0.3%, and a relative uncertainty in the measured quantities of < 20% over the range of detection criteria. The detection rates are highest for the (1–0) transitions of HCO+, HNC, N2H+, and HCN (~77–89%). Almost all clumps (~95%) are detected in at least one of the molecular transitions, just over half of the clumps (~53%) are detected in four or more of the transitions, while only one clump is detected in 13 transitions. We find several striking trends in the ensemble of properties for the different molecular transitions when plotted as a function of the clumps’ evolutionary state as estimated from Spitzer mid-IR images, including (1) HNC is relatively brighter in colder, less evolved clumps than those that show active star formation, (2) N2H+ is relatively brighter in the earlier stages, (3) that the observed optical depth decreases as the clumps evolve, and (4) the optically thickest HCO+ emission shows a ‘blue-red asymmetry’ indicating overall collapse that monotonically decreases as the clumps evolve. This catalogue represents the largest compiled database of line emission towards high-mass clumps and is a valuable data set for detailed studies of these objects.

Item Type: Article
DOI/Identification number: 10.1017/pasa.2016.23
Additional information: Unmapped bibliographic data: LA - English [Field not mapped to EPrints] J2 - Publ. Astron. Soc. Aust. [Field not mapped to EPrints] AD - CSIRO Astronomy and Space Science, PO Box 76, Epping, NSW 1710, Australia [Field not mapped to EPrints] AD - Physics Department, Boston University, Boston, MA 02215, USA [Field not mapped to EPrints] AD - Institute for Astrophysical Research, Boston University, Boston, MA 02215, USA [Field not mapped to EPrints] AD - Department of Astronomy, Yale University, P.O. Box 208101, New Haven, CT 06520-8101, USA [Field not mapped to EPrints] AD - Leiden Observatory, Leiden University, PO Box 9513, NL-2300 RA, Leiden, the Netherlands [Field not mapped to EPrints] AD - Departamento de Astronomía, Universidad de Chile, Camino el Observatorio 1515, Las Condes, Santiago, Chile [Field not mapped to EPrints] AD - Astrophysics Research Institute, Liverpool John Moores University, 146 Brownlow Hill, Liverpool L3 5RF, UK [Field not mapped to EPrints] AD - National Astronomical Observatory of Japan, 2-21-1- Osawa, Mitaka, Tokyo 181-8588, Japan [Field not mapped to EPrints] AD - European Southern Observatory, Alonso de Cordova 3107, Vitacura, Santiago, Chile [Field not mapped to EPrints] AD - Max Planck Institute for Radioastronomy, Auf dem Hugel 69, 53121, Bonn, Germany [Field not mapped to EPrints] AD - Centre for Astrophysics and Planetary Science, University of Kent, Canterbury, CT2 7NH, UK [Field not mapped to EPrints] DB - Scopus [Field not mapped to EPrints] M3 - Article in Press [Field not mapped to EPrints]
Uncontrolled keywords: ISM: clouds, ISM: molecules, stars: formation, catalogs
Subjects: Q Science > QB Astronomy > QB460 Astrophysics
Divisions: Faculties > Sciences > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences
Depositing User: James Urquhart
Date Deposited: 10 Oct 2016 09:10 UTC
Last Modified: 12 Jul 2019 10:04 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/57822 (The current URI for this page, for reference purposes)
Urquhart, J.S.: https://orcid.org/0000-0002-1605-8050
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