Multi-Scale CLEAN: A comparison of its performance against classical CLEAN in galaxies using THINGS
Joshua Rich,W. J. G. de Blok,Tim J. Cornwell,Elias Brinks,Fabian Walter,Ioannis Bagetakos,Robert C. Kennicutt +6 more
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TLDR
In this paper, a practical evaluation of the Multi-Scale CLEAN algorithm is presented, and 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-scaleCLEAN algorithm.Abstract:
A practical evaluation of the Multi-Scale CLEAN algorithm is presented. The data used in the comparisons are taken from The HI Nearby Galaxy Survey (THINGS). 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 reduces significantly the effects of the clean `bowl' 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: HI holes in the interstellar medium and anomalous gas structures outside the main galactic disk.read more
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Journal ArticleDOI
Things:the hi nearby galaxy survey
Fabian Walter,Elias Brinks,W. J. G. de Blok,Frank Bigiel,Robert C. Kennicutt,Michele D. Thornley,Adam Leroy +6 more
TL;DR: The HI Nearby Galaxy Survey (THINGS) as discussed by the authors is a high spectral (≤52kms −1 ) and spatial (∼ 6 ′′ ) resolution survey of HI emission in 34 nearby galaxies obtained using the NRAO Very Large Array (VLA).
Journal ArticleDOI
Little Things
Deidre A. Hunter,Dana Ficut-Vicas,Trisha Ashley,Elias Brinks,Phil Cigan,Bruce G. Elmegreen,Volker Heesen,Kimberly A. Herrmann,Megan Johnson,Se-Heon,Michael P. Rupen,Andreas Schruba,Caroline E. Simpson,Fabian Walter,David J. Westpfahl,Lisa M. Young,Hong-Xin Zhang +16 more
TL;DR: The LITTLE THINGS (Local Irregulars That Trace Luminosity Extremes, The HI Nearby Galaxy Survey) survey as discussed by the authors is a multi-wavelength survey of 37 Dwarf Irregular and 4 Blue Compact Dwarf galaxies that is centered around HI-line data obtained with the National Radio Astronomy Observatory (NRAO) Very Large Array (VLA) for determining what drives star formation in dwarf galaxies.
Journal ArticleDOI
Kiloparsec-scale dust disks in high-redshift luminous submillimeter galaxies.
Jacqueline Hodge,A. M. Swinbank,Julian M Simpson,Ian Smail,Fabian Walter,David M. Alexander,Frank Bertoldi,A. D. Biggs,W. N. Brandt,Scott Chapman,Chian-Chou Chen,Kristen Coppin,Peter Timothy Cox,Helmut Dannerbauer,Helmut Dannerbauer,Alastair C. Edge,Thomas R. Greve,Rob Ivison,Rob Ivison,Alexander Karim,Kirsten Kraiberg Knudsen,Karl M. Menten,Hans-Walter Rix,Eva Schinnerer,Julie Wardlow,Axel Weiss,P. van der Werf +26 more
TL;DR: In this article, high-resolution (0 ''.6) 870 mu m Atacama Large Millimeter/submillimeter Array (ALMA) imaging of 16 luminous (LIR similar to 4 x 10(12) L-circle dot) submillimeter galaxies (SMGs) from the ALESS survey of the Extended Chandra Deep Field South was presented.
Journal ArticleDOI
Molecular and atomic gas in the Local Group galaxy M 33
Pierre Gratier,J. Braine,Nemesio Rodriguez-Fernandez,K. F. Schuster,C. Kramer,Emmanuel M. Xilouris,Fatemeh Tabatabaei,Carsten Henkel,Edvige Corbelli,Frank P. Israel,P. van der Werf,D. Calzetti,Santiago García-Burillo,Albrecht Sievers,Francoise Combes,Tommy Wiklind,N. Brouillet,Fabrice Herpin,Sylvain Bontemps,Susanne Aalto,Bärbel S. Koribalski,F. F. S. van der Tak,Martina C. Wiedner,Markus Röllig,Bhaswati Mookerjea +24 more
TL;DR: In this paper, high-resolution large-scale observations of the molecular and atomic gas in the Local Group galaxy M 33 were carried out using the HEterodyne Receiver Array (HERA) at the 30 m IRAM telescope in the CO(2-1) line, achieving a resolution of 12 '' x 2.
Journal ArticleDOI
An optimized algorithm for multiscale wideband deconvolution of radio astronomical images
A. R. Offringa,Oleg Smirnov +1 more
TL;DR: An improved multi-scale deconvolution algorithm that can also be used in multi-frequency mode, and a new scale-bias function for use inMulti-scale cleaning.
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