FOSTER, Jonathan B.; RATHBORNE, Jill M.; SANHUEZA, Patricio; CLAYSMITH, Chris; WHITAKER, J. Scott; JACKSON, James M.; MASCOOP, Joshua L.; WIENEN, Marion; BREEN, Shari L.; HERPIN, Fabrice; DUARTE-CABRAL, A.; CSENGERI, Timea; CONTRERAS, Yanett; INDERMUEHLE, Balt; BARNES, Peter J.; WALSH, Andrew J.; CUNNINGHAM, Maria R.; BRITTON, Tui R.; VORONKOV, Maxim A.; URQUHART, James S.; ALVES, João; JORDAN, Christopher H.; HILL, Tracey; HOQ, Sadia; BROOKS, Kate J.; LONGMORE, Steven N.

doi:10.1017/pasa.2013.18

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Publications of the Astronomical Society of Australia. 2013, vol. 30, p. id.e038

Cambridge University Press (CUP)

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We characterize the Millimeter Astronomy Legacy Team 90 GHz (MALT90) Survey 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 arcseconds. 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.< Leer menos

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

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