Characterisation of the MALT90 survey and the mopra telescope at 90 GHz

Foster, J.B., Rathborne, J.M., Sanhueza, P., Claysmith, C., Whitaker, J.S., Jackson, J.M., Mascoop, J.L., Wienen, M., Breen, S.L., Herpin, F., and others. (2013) Characterisation of the MALT90 survey and the mopra telescope at 90 GHz. Publications of the Astronomical Society of Australia, 30 (1). p. 18. ISSN 1323-3580. (doi:10.1017/pasa.2013.18) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided) (KAR id:52203)

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Official URL: http://www.dx.doi.org/10.1017/pasa.2013.18

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
DOI/Identification number:	10.1017/pasa.2013.18
Uncontrolled keywords:	astrochemistry, H ii regions, instrumentation: spectrographs, ISM: individual (RCW 65), radio lines: ISM, telescopes
Subjects:	Q Science > QB Astronomy > QB460 Astrophysics
Divisions:	Divisions > Division of Natural Sciences > Physics and Astronomy
Depositing User:	James Urquhart
Date Deposited:	24 Nov 2015 12:27 UTC
Last Modified:	03 Sep 2021 14:00 UTC
Resource URI:	https://kar.kent.ac.uk/id/eprint/52203 (The current URI for this page, for reference purposes)

University of Kent Author Information

Urquhart, J.S..

Creator's ORCID:	https://orcid.org/0000-0002-1605-8050
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