Abstract
Broad-band ground-based infrared photometry has been carried on ever since Harold Johnson adopted wide-band filters that only loosely matched the Earth’s atmospheric windows. Here we describe the “evolution” of filters to produce improved precision, and suggest why it has taken so long to reach the high precision that this spectral region can provide. We further describe the design of new filters that achieve this result, and the trials that were undertaken to demonstrate their superiority. Finally, we discuss the price to be paid for the improved precision, in the form of lower throughput, and why it should be paid: to achieve not only higher precision (i.e., improved signal-to-noise ratio), but also lower extinction, and thus higher accuracy in extra-atmospheric magnitudes.
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Acknowledgements
The support of the Physics & Astronomy Department of the University of Calgary has been critical to the success of the IRWG experiments and results. It is a pleasure to thank undergraduate astrophysics majors in the senior astrophysics laboratory course that EFM taught for more than a decade, especially the summer assistants who were recruited from that course, among whom were: Kyle Degenhardt, Kerry Dubray, Danielle Fraser, Christopher Ostrowski, Jon Ramsey, Russell Shanahan, Caleb Sundstrom, and Christopher Winder, for conscientious assistance with observations and data reduction. Dr. Philip Langill, then Resident Astronomer at the RAO, and Dr. Alfredo Louro also assisted with data acquisition. Over the past decade, Michael Williams improved telescope software and helped train observers. RAO technician, Frederick Babott maintained all the RAO instrument systems, including the infrared, since their inception; most recently, that work was taken over by James Pike. Much of the work described here was supported by grants to EFM from the Natural Sciences and Engineering Research Council and the National Research Council of Canada, which, as always, are gratefully acknowledged. This paper is No. 78 in the Publications of the RAO reprint series.
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Milone, E.F., Young, A.T. (2011). The Rise and Improvement of Infrared Photometry. In: Milone, E., Sterken, C. (eds) Astronomical Photometry. Astrophysics and Space Science Library, vol 373. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-8050-2_6
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