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arXiv 1306.0560astro-ph.IMastro-ph.GA
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MALT90巡天和90 GHz Mopra望远镜的特性

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

Jonathan B. Foster, Jill M. Rathborne, Patricio Sanhueza, Chris Claysmith, J. Scott Whitaker, James M. Jackson, Joshua L. Mascoop, Marion Wienen, Shari L. Breen… 展开作者

Jonathan B. Foster, Jill M. Rathborne, Patricio Sanhueza, Chris Claysmith, J. Scott Whitaker, James M. Jackson, Joshua L. Mascoop, Marion Wienen, Shari L. Breen, Fabrice Herpin, Ana Duarte-Cabral, Timea Csengeri, Yanett Contreras, Balt Indermuehle, Peter J. Barnes, Andrew J. Walsh, Maria R. Cunningham, Tui R. Britton, Maxim A. Voronkov, James S. Urquhart, João Alves, Christopher H. Jordan, Tracey Hill, Sadia Hoq, Kate J. Brooks, Steven N. Longmore

摘要:

我们表征毫米天文遗产团队90 GHz(MALT 90)调查和90 GHz的Mopra望远镜。我们将源G300.968+01.145的重复位置切换观测与同一源的地图相结合,以估计位置切换观测的指向可靠性,并通过扩展,MALT 90调查;我们估计我们的指向不确定性为8弧秒。我们模拟了两个最强的系统增益变化源作为海拔和时间的函数,并量化了剩余的绝对通量不确定性。基于这两个变量的校正将重复观测的分散度从12-25%降低到10- 17%。我们在G300.968+01.145中没有发现内在源变异的证据。对于某些应用,本文所述的校正将是不可或缺的,用于改进MALT 90地图的绝对通量校准和使用90 GHz的Mopra望远镜的其他观测。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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