Multi-scale clean: A Comparison of its performance against classical clean on galaxies using things

J. W. Rich; W. J.G. De Blok; T. J. Cornwell; E. Brinks; F. Walter; I. Bagetakos; R. C. Kennicutt

doi:10.1088/0004-6256/136/6/2897

Multi-scale clean: A Comparison of its performance against classical clean on galaxies using things

J. W. Rich, W. J.G. De Blok, T. J. Cornwell, E. Brinks, F. Walter, I. Bagetakos, R. C. Kennicutt

Research output: Contribution to journal › Article › peer-review

51 Citations (Scopus)

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.

Original language	English
Pages (from-to)	2897-2920
Number of pages	24
Journal	Astronomical Journal
Volume	136
Issue number	6
DOIs	https://doi.org/10.1088/0004-6256/136/6/2897
Publication status	Published - 2008

Access to Document

10.1088/0004-6256/136/6/2897

Cite this

@article{13cd5d3e9d3b424790995e176bbf1a2f,

title = "Multi-scale clean: A Comparison of its performance against classical clean on galaxies using things",

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.",

keywords = "Galaxies: individual (NGC 2403, IC 2574, Holmberg II), ISM: structure, Techniques: image processing",

author = "Rich, {J. W.} and {De Blok}, {W. J.G.} and Cornwell, {T. J.} and E. Brinks and F. Walter and I. Bagetakos and Kennicutt, {R. C.}",

year = "2008",

doi = "10.1088/0004-6256/136/6/2897",

language = "English",

volume = "136",

pages = "2897--2920",

journal = "Astronomical Journal",

issn = "0004-6256",

publisher = "American Astronomical Society",

number = "6",

}

TY - JOUR

T1 - Multi-scale clean

T2 - A Comparison of its performance against classical clean on galaxies using things

AU - Rich, J. W.

AU - De Blok, W. J.G.

AU - Cornwell, T. J.

AU - Brinks, E.

AU - Walter, F.

AU - Bagetakos, I.

AU - Kennicutt, R. C.

PY - 2008

Y1 - 2008

N2 - 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.

AB - 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.

KW - Galaxies: individual (NGC 2403, IC 2574, Holmberg II)

KW - ISM: structure

KW - Techniques: image processing

UR - http://www.scopus.com/inward/record.url?scp=66149150138&partnerID=8YFLogxK

U2 - 10.1088/0004-6256/136/6/2897

DO - 10.1088/0004-6256/136/6/2897

M3 - Article

SN - 0004-6256

VL - 136

SP - 2897

EP - 2920

JO - Astronomical Journal

JF - Astronomical Journal

IS - 6

ER -

Multi-scale clean: A Comparison of its performance against classical clean on galaxies using things

Abstract

Access to Document

Other files and links

Fingerprint

Cite this