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Article: Digital stacking of tech pan films and the photometry of faint galaxies

TitleDigital stacking of tech pan films and the photometry of faint galaxies
Authors
KeywordsImage processing
Galaxies: Photometry
-galaxies
-clusters: Virgo cluster
Issue Date1996
Citation
Astronomy and Astrophysics Supplement Series, 1996, v. 117, n. 1, p. 179-187 How to Cite?
AbstractWe describe the processing and co-addition of digitised scans of Tech Pan films, and discuss the scientific and photometric gains obtained from use of co-added films. This work is based on SuperCOSMOS scans at 10 fim resolution of small regions of the Virgo cluster, which form part of a large-scale survey for low surface brightness galaxies in Virgo. Use of co-added Tech Pan films allows the detection and surface photometry of such galaxies to very faint limits, and therefore provides an invaluable tool for a deeper sampling of the cluster galaxy luminosity function over large areas of sky. The calibration steps necessary before the films can be stacked are described in detail, as well as the stacking process itself. Median-stacking is found to be more effective than averaging or simple adding of individual images, mainly due to its ability in removing spurious features present on single films. We also discuss several of the properties of stacked Tech Pan films, such as background variations, the extent of galaxy profiles and the detectability of small, faint galaxies.
Persistent Identifierhttp://hdl.handle.net/10722/208879
ISSN
2000 Impact Factor: 1.745
2003 SCImago Journal Rankings: 2.068

 

DC FieldValueLanguage
dc.contributor.authorSchwartzenberg, Jean Marc-
dc.contributor.authorPhillipps, Steven-
dc.contributor.authorParker, Quentin A.-
dc.date.accessioned2015-03-23T02:02:02Z-
dc.date.available2015-03-23T02:02:02Z-
dc.date.issued1996-
dc.identifier.citationAstronomy and Astrophysics Supplement Series, 1996, v. 117, n. 1, p. 179-187-
dc.identifier.issn0365-0138-
dc.identifier.urihttp://hdl.handle.net/10722/208879-
dc.description.abstractWe describe the processing and co-addition of digitised scans of Tech Pan films, and discuss the scientific and photometric gains obtained from use of co-added films. This work is based on SuperCOSMOS scans at 10 fim resolution of small regions of the Virgo cluster, which form part of a large-scale survey for low surface brightness galaxies in Virgo. Use of co-added Tech Pan films allows the detection and surface photometry of such galaxies to very faint limits, and therefore provides an invaluable tool for a deeper sampling of the cluster galaxy luminosity function over large areas of sky. The calibration steps necessary before the films can be stacked are described in detail, as well as the stacking process itself. Median-stacking is found to be more effective than averaging or simple adding of individual images, mainly due to its ability in removing spurious features present on single films. We also discuss several of the properties of stacked Tech Pan films, such as background variations, the extent of galaxy profiles and the detectability of small, faint galaxies.-
dc.languageeng-
dc.relation.ispartofAstronomy and Astrophysics Supplement Series-
dc.subjectImage processing-
dc.subjectGalaxies: Photometry-
dc.subject-galaxies-
dc.subject-clusters: Virgo cluster-
dc.titleDigital stacking of tech pan films and the photometry of faint galaxies-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-4243810383-
dc.identifier.volume117-
dc.identifier.issue1-
dc.identifier.spage179-
dc.identifier.epage187-

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