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Characterisation of the MALT90 Survey and the Mopra Telescope at 90 GHz


Foster, JB and Rathborne, JM and Sanhueza, P and Claysmith, C and Whitaker, JS and Jackson, JM and Mascoop, JL and Wienen, M and Breen, SL and Herpin, F and Duarte-Cabral, A and Csengeri, T and Contreras, Y and Indermuehle, B and Barnes, PJ and Walsh, AJ and Cunningham, MR and Britton, TR and Voronkov, MA and Urquhart, JS and Alves, J and Jordan, CH and Hill, T and Hoq, S and Brooks, KJ and Longmore, SN, Characterisation of the MALT90 Survey and the Mopra Telescope at 90 GHz, Publications of the Astronomical Society of Australia, 30 Article e038. ISSN 1448-6083 (2013) [Refereed Article]

Copyright Statement

Copyright 2013 Astronomical Society of Australia

DOI: doi:10.1017/pasa.2013.18


We characterise the Millimetre Astronomy Legacy Team 90 GHz Survey (MALT90) and the Mopra telescope at 90 GHz. We combine repeated position-switched observations of the source G300.968+01.145 with a map of the same source in order to estimate the pointing reliability of the position-switched observations and, by extension, the MALT90 survey; we estimate our pointing uncertainty to be 8 arcsec. We model the two strongest sources of systematic gain variability as functions of elevation and time-of-day and quantify the remaining absolute flux uncertainty. Corrections based on these two variables reduce the scatter in repeated observations from 12%–25% down to 10%–17%. We find no evidence for intrinsic source variability in G300.968+01.145. For certain applications, the corrections described herein will be integral for improving the absolute flux calibration of MALT90 maps and other observations using the Mopra telescope at 90 GHz.

Item Details

Item Type:Refereed Article
Keywords:astrochemistry; H II regions; instrumentation: spectrographs; ISM: individual (RCW 65); radio lines: ISM; telescopes
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Astronomical instrumentation
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Jordan, CH (Mr Christopher Jordan)
ID Code:87075
Year Published:2013
Web of Science® Times Cited:43
Deposited By:Mathematics and Physics
Deposited On:2013-11-06
Last Modified:2014-04-02

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