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Foster, JB, Rathborne, JM, Sanhueza, P, Claysmith, C, Whitaker, JS, Jackson, JM, Mascoop, JL, Wienen, M, Breen, SL, Herpin, F, Duarte-Cabral, A, Csengeri, T, Contreras, Y, Indermuehle, B, Barnes, PJ, Walsh, AJ, Cunningham, MR, Britton, TR, Voronkov, MA, Urquhart, JS , Alves, J, Jordan, CH, Hill, T, Hoq, S, 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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1306.0560v2.pdf - Accepted Version Download (1MB) | Preview |
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 |
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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: | 08 Jun 2016 11:07 |
| Last Modified: | 04 Sep 2021 12:50 |
| DOI or ID number: | 10.1017/pasa.2013.18 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/3733 |
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