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Malin 1: A Deeper Look
Lesa
Moore A C,
Quentin A.
Parker A B
A
Department of Physics, Macquarie University, Sydney NSW 2109, Australia
B
Anglo-Australian Observatory, PO Box 296, Epping NSW 2121, Australia
C
Corresponding author. E-mail: lmoore@ics.mq.edu.au
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Publications of the Astronomical Society of Australia 23(4) 165–169 http://dx.doi.org/10.1071/AS06022
Submitted: 22 September 2006
Accepted: 19 February 2007
Published online: 14 March 2007
Abstract
Our R-band data show that the optical light from Malin 1 corresponds well with the >2-arcmin extent of the galaxy's HIi content and continues well beyond previously published V-band optical light radial profiles. Analysis of our image yields improved understanding of the galaxy's properties. We measure ellipticity of 0.20 ± 0.03, implying inclination of 38 ± 3°, and we trace the radial profile to 77 arcsec. A single dusty spiral arm is also weakly discernable, and is consistent with the rotation direction of the Hi and spiral structure of the inner disk. Possible scenarios for the origin of the spiral structure are discussed.
Keywords:
galaxies: evolution,
galaxies: fundamental parameters,
galaxies: individual (Malin 1),
techniques: image processing
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