Data Reduction Process and Pipeline for the NIC Polarimetry Mode in Python, NICpolpy

A systematic way of data reduction for the NIC polarimetry mode has been devised and implementedto an open software called NICpolpy in the programming language python (tested on version 3.8–3.10 asof writing). On top of the classical methods, including vertical pattern removal, a new way of diagonal...

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Vydané v:	Stars and Galaxies Ročník 5; s. 4
Hlavní autori:	Geem, Jooyeon, Bach, Yoonsoo, Ishiguro, Masateru, Takahash, Jun
Médium:	Journal Article
Jazyk:	English
Vydavateľské údaje:	Center for Astronomy, University of Hyogo 2022 兵庫県立大学自然・環境科学研究所天文科学センター
Predmet:	methods: data analysis methods: observational techniques: image processing techniques: polarimetric
ISSN:	2434-270X
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Popis
Shrnutí:	A systematic way of data reduction for the NIC polarimetry mode has been devised and implementedto an open software called NICpolpy in the programming language python (tested on version 3.8–3.10 asof writing). On top of the classical methods, including vertical pattern removal, a new way of diagonalpattern (Fourier pattern) removal has been implemented. Each image undergoes four reduction steps,resulting in “level 1” to “level 4” products, as well as nightly calibration frames. A simple tutorial andin-depth descriptions are provided, as well as the descriptions of algorithms. The dome flat frames (takenon UT 2020-06-03) were analyzed, and the pixel positions vulnerable to flat error were found. Using thedark and flat frames, the detector parameters, gain factor (the conversion factor), and readout noise arealso updated. We found gain factor and readout noise are likely constants over pixel or “quadrant”.
ISSN:	2434-270X
DOI:	10.32231/starsandgalaxies.5.0_4