Journal Article

A unified picture of breaks and truncations in spiral galaxies from SDSS and S<sup>4</sup>G imaging

Ignacio Martín-Navarro, Judit Bakos, Ignacio Trujillo, Johan H. Knapen, E. Athanassoula, Albert Bosma, Sébastien Comerón, Bruce G. Elmegreen, Santiago Erroz-Ferrer, Dimitri A. Gadotti, Armando Gil de Paz, Joannah L. Hinz, Luis C. Ho, Benne W. Holwerda, Taehyun Kim, Jarkko Laine, Eija Laurikainen, Karín Menéndez-Delmestre, Trisha Mizusawa, Juan-Carlos Muñoz-Mateos, Michael W. Regan, Heikki Salo, Mark Seibert and Kartik Sheth

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 427, issue 2, pages 1102-1134
Published in print December 2012 | ISSN: 0035-8711
Published online December 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.21929.x
A unified picture of breaks and truncations in spiral galaxies from SDSS and S4G imaging

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The mechanism causing breaks in the radial surface-brightness distribution of spiral galaxies is not yet well known. Despite theoretical efforts, there is not a unique explanation for these features and the observational results are not conclusive. In an attempt to address this problem, we have selected a sample of 34 highly inclined spiral galaxies present in both the Sloan Digital Sky Survey (SDSS) and the Spitzer Survey of Stellar Structure in Galaxies (S4G). We have measured the surface-brightness profiles in the five Sloan optical bands and in the 3.6-μm Spitzer band. We have also calculated the colour and stellar surface mass density profiles using the available photometric information, finding two differentiated features: an innermost break radius at distances of ∼8 ± 1 kpc [0.77 ± 0.06 R25] and a second characteristic radius, or truncation radius, close to the outermost optical extent (∼14 ± 2 kpc [1.09 ± 0.05 R25]) of the galaxy. We propose in this work that breaks might be phenomena related to a threshold in the star formation, while truncations are more likely a real drop in the stellar mass density of the disc associated with the maximum angular momentum of the stars.

Keywords: galaxies: formation; galaxies: fundamental parameters; galaxies: photometry; galaxies: spiral; galaxies: structure

Journal Article.  10036 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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