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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 (2013) Characterisation of the MALT90 Survey and the Mopra Telescope at 90 GHz. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA, 30 (38). ISSN 1323-3580

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Abstract

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 Type: Article
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: CAMBRIDGE UNIV PRESS
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Date Deposited: 08 Jun 2016 11:07
Last Modified: 08 Jun 2016 11:07
DOI or Identification number: 10.1017/pasa.2013.18
URI: http://researchonline.ljmu.ac.uk/id/eprint/3733

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