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NSClean: An Algorithm for Removing Correlated Noise from JWST NIRSpec Images

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arxiv 2306.03250 v2 pith:RETXZOJY submitted 2023-06-05 astro-ph.IM

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keywords nscleanjwstnoisealgorithmcorrelatedimagesmodelnasa
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NSClean is an algorithm and associated python package for removing faint vertical banding and ``picture frame noise'' from JWST Near Infrared Spectrograph (NIRSpec) images. NSClean uses known dark areas to fit a background model to each exposure in Fourier space. When the model is subtracted, it removes nearly all correlated noise. Compared to simpler strategies like subtracting the rolling median, NSClean is more thorough and uniform. NSClean is computationally undemanding, requiring only a few seconds to clean an image on a typical laptop. The NSClean package is freely available from the NASA JWST website (https://webb.nasa.gov/content/forScientists/publications.html).

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Cited by 2 Pith papers

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    Ultra-deep JWST/NIRSpec spectra of nine faint galaxies at z~2.5 yield low SFRs, low dust, low electron densities, and hints of a very-low-metallicity turnover in the [OIII]/Hβ diagnostic.

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