ON IMPROVING THE CALIBRATION OF MILLIMETER AND SUBMILLIMETER PHOTOMETRY AT THE JAMES-CLERK-MAXWELL-TELESCOPE

被引：24
|
作者：
STEVENS, JA [1 ]
ROBSON, EI [1 ]
机构：
[1] JOINT ASTRON CTR,HILO,HI 96720
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 1994年 / 270卷 / 04期
关键词：
ATMOSPHERIC EFFECTS; METHODS; OBSERVATIONAL; TECHNIQUES; PHOTOMETRIC; RADIO CONTINUUM; GENERAL;
D O I：
10.1093/mnras/270.1.L75
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
A method is described for deriving the atmospheric extinction coefficients corresponding to the passband filters in the James Clerk Maxwell Telescope (JCMT) common-user photometer. This method takes advantage of the extinction determined by skydips performed at 225 GHz at the adjacent Caltech Submillimeter Observatory (CSO). Scaling factors, by which the CSO extinction must be multiplied in order to give the required extinction, can be calculated by monitoring standard sources over a range in airmass on stable nights. Values are presented for most of the JCMT filters, and for the 800-mu m filter it is shown that the factor is not constant, but is correlated with the CSO extinction. An empirical relationship is derived between the 800-mu m extinction and the CSO extinction.
引用
收藏
页码：L75 / L79
页数：5
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