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3 years ago in Astronomy , Instrumentation By Rani
How can I determine the position of each fiber in the sky for IFU data?
I've received my first dataset from a telescope using an IFU, like VLT/MUSE or similar. I have the spectra, but the data cube reconstruction seems like magic. How do I know which fiber corresponds to which position relative to my target? I need to understand the calibration step that translates fiber number into an actual right ascension and declination.
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By Rinku Answered 1 year ago
This is a fundamental step, and it hinges on your instrument's specific calibration data. Typically, you'll use a "fiber position table" or a "trace map" created during daytime calibration. This file contains the known (x, y) position of each fiber's projection on the detector. For sky coordinates, you must observe a star field or a standard star through the IFU. I would recommend using a pipeline like the one for MUSE or the PYPIPE tools. By cross-matching the detected star positions in your fiber data with a catalog like Gaia, the software computes the World Coordinate System (WCS) transformation, assigning an RA and Dec to every fiber
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