Astronomical image subtraction by cross-convolution

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dc.contributor.authorYuan, Fang
dc.contributor.authorAkerlof, C. W.
dc.date.accessioned2015-12-13T22:53:53Z
dc.date.issued2008
dc.date.updated2015-12-11T11:00:34Z
dc.description.abstractIn recent years, there has been a proliferation of wide-field sky surveys to search for a variety of transient objects. Using relatively short focal lengths, the optics of these systems produce undersampled stellar images often marred by a variety of aberrations. As participants in such activities, we have developed a new algorithm for image subtraction that no longer requires high-quality reference images for comparison. The computational efficiency is comparable with similar procedures currently in use. The general technique is cross-convolution: two convolution kernels are generated to make a test image and a reference image separately transform to match as closely as possible. In analogy to the optimization technique for generating smoothing splines, the inclusion of an rms width penalty term constrains the diffusion of stellar images. In addition, by evaluating the convolution kernels on uniformly spaced subimages across the total area, these routines can accommodate point-spread functions that vary considerably across the focal plane.
dc.identifier.issn2041-8205
dc.identifier.urihttp://hdl.handle.net/1885/82018
dc.publisherInstitute of Physics Publishing Ltd.
dc.sourceAstrophysical Journal Letters
dc.subjectKeywords: Methods: statistical; Techniques: photometric
dc.titleAstronomical image subtraction by cross-convolution
dc.typeJournal article
local.bibliographicCitation.issue1
local.bibliographicCitation.lastpage812
local.bibliographicCitation.startpage808
local.contributor.affiliationYuan, Fang, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationAkerlof, C W, University of Michigan
local.contributor.authoremailu4981546@anu.edu.au
local.contributor.authoruidYuan, Fang, u4981546
local.description.embargo2037-12-31
local.description.notesImported from ARIES
local.identifier.absfor020199 - Astronomical and Space Sciences not elsewhere classified
local.identifier.ariespublicationf5625xPUB10319
local.identifier.citationvolume677
local.identifier.doi10.1086/529040
local.identifier.scopusID2-s2.0-42549114831
local.identifier.thomsonID000254754300067
local.identifier.uidSubmittedByf5625
local.type.statusPublished Version

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