Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-12-19
Astrophys.J.659:162-187,2007
Astronomy and Astrophysics
Astrophysics
28 pages, LaTeX2e, 17 figures, 9 tables, and a modified class file emulateapj_rj.cls are included. Accepted for publication in
Scientific paper
10.1086/511806
We present a quantitative analysis of the morphologies for 199 nearby galaxies as parameterized with measurements of the concentration, asymmetry, and clumpiness (CAS) parameters at wavelengths from 0.15-0.85 micrometers. We find that these CAS parameters depend on both galaxy type and the wavelength of observation. As such, we use them to obtain a quantitative measure of the "morphological k-correction", i.e., the change in appearance of a galaxy with rest-frame wavelength. Whereas early-type galaxies (E--S0) appear about the same at all wavelengths longward of the Balmer break, there is a mild but significantly-determined wavelength-dependence of the CAS parameters for galaxies types later than S0, which generally become less concentrated, and more asymmetric and clumpy toward shorter wavelengths. Also, as a merger progresses from pre-merger via major-merger to merger-remnant stages, it evolves through the CAS parameter space, becoming first less concentrated and more asymmetric and clumpy, and then returning towards the "locus" of normal galaxies. The final merger products are, on average, much more concentrated than normal spiral galaxies.
Conselice Christopher
Jansen Rolf
Taylor-Mager Violet
Windhorst Rogier
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