Photometric accuracy with Multi-Field imager in MIR wavelength | Tsubasa Michifuji | Thursday Morning Session 1
MIMIZUKU is the mid-infrared camera mounted on TAO. It has a unique system, Field Stacker. This system has two Field-of-Views (FoVs) and enables us to observe a pair of distant targets simultaneously. By comparing them, we can accurately cancel the atmospheric absorption, and we aim to perform relative photometry with an accuracy of a few percent. To achieve this, precise flat fielding is important. However, in ground-based mid-infrared observations, the best way of making flat frames is not established.
We have developed a new method of making flat frames by using time variation of sky background. This method is applied to analyze the data obtained with MIMIZUKU at Subaru. The estimated error of the flat fielding reached to about 0.3%, and a photometric error of about 2% was achieved. The difference between these errors cannot be attributed to only shot noise and suggests that there would be other factors such as the spatial difference of the atmospheric absorption between the FoVs.
