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MOIRCS field of viewImaging modeMOIRCS imaging field of view (FOV: 4' x 7') is sampled by two detectors, each of which has a 4' x 3.5' area. The long side of the FOV is the North-South direction on the sky for PA=0. Note that the raw FITS data from each detector is stored with the rotated layout by 90 degrees clockwise as shown in the middle panel of Figure 1. Therefore the Y-axis side on the raw FITS data will be the 4'-length side. The positive X-axis direction in the raw FITS data is to the North for PA=0, with the counterclockwise move of FOV on the sky being the positive move of the PA. There is a ~30 arcsec-width area that is not used for imaging observation at a side of each detector (see Figure 1 middle). And also, there is a slight gap (a few arcseconds) between both channel images after mosaicking. The telescope pointing center just falls into the gap, so make sure to move the target to one of the channels if your target is a single compact object. We note that the Hawaii-2RG detector has 4-pixel-wide "reference pixels" on each side. The sensitive pixel region is 2040 x 2040.
Spectroscopy modeIn spectroscopy mode, each the spatial and the dispersion direction of the spectra are each in y- and x-axis direction in the RAW image coordinate, respectively. Spectra are imaged also onto the ~30"-width "unused" area for the imaging mode. Please refer to the MOS page.
Updated 2022-07-28
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