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

被引：50

作者：

Foster, J. B. ^{[1
,2
]}

Rathborne, J. M. ^{[3
]}

Sanhueza, P. ^{[2
]}

Claysmith, C. ^{[2
]}

Whitaker, J. S. ^{[4
]}

Jackson, J. M. ^{[2
]}

Mascoop, J. L. ^{[2
]}

Wienen, M. ^{[5
]}

Breen, S. L. ^{[3
]}

Herpin, F. ^{[6
,7
]}

Duarte-Cabral, A. ^{[6
,7
]}

Csengeri, T. ^{[5
]}

Contreras, Y. ^{[3
]}

Indermuehle, B. ^{[3
]}

Barnes, P. J. ^{[8
]}

Walsh, A. J. ^{[9
]}

Cunningham, M. R. ^{[10
]}

Britton, T. R. ^{[3
,11
]}

Voronkov, M. A. ^{[3
]}

Urquhart, J. S. ^{[5
]}

Alves, J. ^{[12
]}

Jordan, C. H. ^{[3
,13
]}

Hill, T. ^{[14
,15
]}

Hoq, S. ^{[2
]}

Brooks, K. J. ^{[3
]}

Longmore, S. N. ^{[16
,17
]}

机构：

[1] Yale Univ, Yale Ctr Astron & Astrophys, New Haven, CT 06520 USA

[2] Boston Univ, Inst Astrophys Res, Boston, MA 02215 USA

[3] CSIRO Astron & Space Sci, Epping, NSW 1710, Australia

[4] Boston Univ, Dept Phys, Boston, MA 02215 USA

[5] Max Planck Inst Radioastron, D-53121 Bonn, Germany

[6] Univ Bordeaux, LAB, UMR 5804, F-33270 Floirac, France

[7] CNRS, LAB, UMR 5804, F-33270 Floirac, France

[8] Univ Florida, Dept Astron, Gainesville, FL 32611 USA

[9] Curtin Univ, Int Ctr Radio Astron Res, Perth, WA 6845, Australia

[10] Univ New S Wales, Sch Phys, Sydney, NSW 2052, Australia

[11] Macquarie Univ, Dept Phys & Astron, Sydney, NSW 2109, Australia

[12] Univ Vienna, Dept Astrophys, A-1180 Vienna, Austria

[13] Univ Tasmania, Sch Math & Phys, Hobart, Tas 7001, Australia

[14] Univ Paris Diderot, CEA Saclay, CNRS, CEA,IRFU,INSU,Lab AIM Paris Saclay, F-91191 Gif Sur Yvette, France

[15] Joint ALMA Observ, Santiago 7630355, Chile

[16] Liverpool John Moores Univ, Astrophys Res Inst, Birkenhead CH41 1LD, Merseyside, England

[17] European So Observ, D-85748 Garching, Germany

来源：

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA | 2013年 / 30卷

基金：

美国国家科学基金会;

关键词：

astrochemistry; H II regions; instrumentation: spectrographs; ISM: individual (RCW 65); radio lines: ISM; telescopes; ULTRACOMPACT HII-REGIONS; RADIO TELESCOPE; TIME-VARIATION; MASSIVE STARS; OH MASERS; EMISSION; METHANOL; VARIABILITY;

D O I：

10.1017/pasa.2013.18

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页数：23

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