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

J. B. Foster, J. M. Rathborne, P. Sanhueza, C. Claysmith, J. S. Whitaker, J. M. Jackson, J. L. Mascoop, M. Wienen, S. L. Breen, F. Herpin, A. Duarte-Cabral, T. Csengeri, Y. Contreras, B. Indermuehle, P. J. Barnes, A. J. Walsh, M. R. Cunningham, T. R. Britton, M. A. Voronkov, J. S. Urquhart & 6 others J. Alves, C. H. Jordan, T. Hill, S. Hoq, K. J. Brooks, S. N. Longmore

Research output: Contribution to journalReview article

37 Citations (Scopus)

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.

Original languageEnglish
Article numbere038
Pages (from-to)1-23
Number of pages23
JournalPublications of the Astronomical Society of Australia
Volume30
DOIs
Publication statusPublished - 2013

Keywords

  • astrochemistry
  • H ii regions
  • instrumentation: spectrographs
  • ISM: individual (RCW 65)
  • radio lines: ISM
  • telescopes

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