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The Astronomical Journal Volume 136 Number 6 Create an alert RSS this journal

J. W. Rich et al. 2008 The Astronomical Journal 136 2897 doi:10.1088/0004-6256/136/6/2897

MULTI-SCALE CLEAN: A COMPARISON OF ITS PERFORMANCE AGAINST CLASSICAL CLEAN ON GALAXIES USING THINGS

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J. W. Rich1, W. J. G. de Blok2, T. J. Cornwell3, E. Brinks4, F. Walter5, I. Bagetakos4 and R. C. Kennicutt Jr6

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Abstract References Cited By

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.


Keywords

galaxies: individual (NGC 2403, IC 2574, Holmberg II); ISM: structure; techniques: image processing


Dates

Issue 6 (2008 December)

Received 2008 January 25, accepted for publication 2008 October 12

Published 2008 November 18



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