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Title:
Multi-Scale CLEAN: A Comparison of its Performance Against Classical CLEAN on Galaxies Using THINGS
Authors:
Rich, J. W.; de Blok, W. J. G.; Cornwell, T. J.; Brinks, E.; Walter, F.; Bagetakos, I.; Kennicutt, R. C.
Affiliation:
AA(Research School of Astronomy and Astrophysics, Australian National University, Cotter Road, Weston Creek, ACT 2611, Australia ), AB(Department of Astronomy, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa ), AC(Australia Telescope National Facility, P.O. Box 76, Epping NSW 1710, Australia ), AD(Center for Astrophysics Research, University of Hertfordshire,College Lane Hatfield, AL10 9AB, UK ), AE(Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany ), AF(Center for Astrophysics Research, University of Hertfordshire,College Lane Hatfield, AL10 9AB, UK ), AG(Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK )
Publication:
The Astronomical Journal, Volume 136, Issue 6, pp. 2897-2920 (2008). (AJ Homepage)
Publication Date:
12/2008
Origin:
IOP
AJ Keywords:
galaxies: individual: NGC 2403 IC 2574 Holmberg II, ISM: structure, techniques: image processing
DOI:
10.1088/0004-6256/136/6/2897
Bibliographic Code:
2008AJ....136.2897R

Abstract

A practical evaluation of the multi-scale CLEAN algorithm is presented. The data used in the comparisons are taken from The H I Nearby Galaxy Survey. The implementation of multi-scale CLEAN in the CASA software package is used, although comparisons are made against the very similar multi-resolution CLEAN algorithm implemented in AIPS. Both are compared against the classical CLEAN algorithm (as implemented in AIPS). The results of this comparison show that several of the well-known characteristics and issues of using classical CLEAN are significantly lessened (or eliminated completely) when using the multi-scale CLEAN algorithm. Importantly, multi-scale CLEAN significantly reduces the effects of the clean "bowl" that is caused by missing short-spacings, and the "pedestal" of low-level un-cleaned flux (which affects flux scales and resolution). Multi-scale CLEAN can clean down to the noise level without the divergence suffered by classical CLEAN. We discuss practical applications of the added contrast provided by multi-scale CLEAN using two selected astronomical examples: H I holes in the interstellar medium and anomalous gas structures outside the main galactic disk.
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