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Rathborne, JM, Whitaker, JS, Jackson, JM, Foster, JB, Contreras, Y, Stephens, IW, Guzman, AE, Longmore, SN, Sanhueza, P, Schuller, F, Wyrowski, F and Urquhart, JS (2016) Molecular Line Emission Towards High-Mass Clumps: The MALT90 Catalogue. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA, 33. ISSN 1323-3580
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Abstract
The Millimetre Astronomy Legacy Team 90 GHz (MALT90) survey aims to characterise the physical and chemical evolution of high-mass clumps. Recently completed, it mapped 90 GHz line emission toward 3246 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 line catalog of the detected emission, generated by Gaussian profile �fitting to spectra extracted toward each clumps' dust peak. Synthetic spectra show that the catalog 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. We find that the detection rates are highest for the (1{0) molecular transitions of HCO+, HNC, N2H+, and HCN (72{88%). The majority of clumps (~� 95%) are detected in at least one of the molecular transitions, just under half of the clumps (�~48%) are detected in 4 or more of the transitions, while only 2 clumps are detected in 13 or more 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. In particular, the optically thickest HCO+ emission shows a `blue-red asymmetry' that indicates overall collapse that monotonically decreases as the clumps evolve. This catalog represents the largest compiled database of molecular line emission toward high-mass clumps and is a valuable data set for detailed studies of these objects.
| Item Type: | Article |
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| Uncontrolled Keywords: | 0201 Astronomical And Space Sciences |
| Subjects: | Q Science > QB Astronomy |
| Divisions: | Astrophysics Research Institute |
| Publisher: | CAMBRIDGE UNIV PRESS |
| Related URLs: | |
| Date Deposited: | 12 Sep 2016 13:30 |
| Last Modified: | 04 Sep 2021 12:32 |
| DOI or ID number: | 10.1017/pasa.2016.23 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/4139 |
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