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Inverse Chop Addition: Thermal IR Background Subtraction without Nodding
Stockholm University, Faculty of Science, Department of Astronomy.ORCID iD: 0000-0002-0484-7634
2019 (English)In: Research Notes of the AAS, E-ISSN 2515-5172, Vol. 3, no 2, article id 42Article in journal (Other academic) Published
Abstract [en]

Due to the large size and mass of the secondary mirror on next generation extremely large telescopes it will not be possible to provide classical chopping and nodding as is used during mid-IR observations today. As a solution to this we propose an alternative approach to thermal background reduction called `inverse chop addition`. Here we use the symmetries of the thermal background to replace nodding, which allows us to get nearly identical background reductions while only using a special chopping pattern. The performance of this method was tested during technical time observations on VLT/VISIR. With this method, a higher observational efficiency can be obtained than with `classical chopping and nodding`, while achieving equally good reduction results. These results suggest that `inverse chop addition` could be a good alternative for classical chopping and nodding on both current and next generation ground-based facilities.

Place, publisher, year, edition, pages
2019. Vol. 3, no 2, article id 42
Keywords [en]
infrared: general, methods: data analysis, methods: observational, techniques: miscellaneous, telescopes
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Astronomy
Identifiers
URN: urn:nbn:se:su:diva-166458DOI: 10.3847/2515-5172/ab09faOAI: oai:DiVA.org:su-166458DiVA, id: diva2:1292417
Available from: 2019-02-28 Created: 2019-02-28 Last updated: 2019-02-28Bibliographically approved

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CiteExportLink to record
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