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Multi-wavelength characterization of the outskirts of spiral galaxies

Published online by Cambridge University Press:  13 April 2010

Judit Bakos  and
Ignacio Trujillo
Judit Bakos
Affiliation:
Instituto de Astrofísica de Canarias, C/ Vía Lactea, La Laguna, 38205, Tenerife, Spain email: jbakos@iac.es, trujillo@iac.es
Ignacio Trujillo
Affiliation:
Instituto de Astrofísica de Canarias, C/ Vía Lactea, La Laguna, 38205, Tenerife, Spain email: jbakos@iac.es, trujillo@iac.es
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Abstract

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We have explored late-type spiral galaxies with truncated radial surface brightness profiles. Based on the study of optical color profiles, Bakos et al. (2008) suggested that truncated (TYPE II) galaxies have a generally older stellar population in their outer regions: one observable consequence of this would be a strong dependence of the structural parameters of the outer disk on the observing wavelength. To corroborate this result, we obtained surface brightness profiles using data from GALEX(UV), SDSS(optical), UKIDSS(NIR) and SPITZER-IRAC(IR). We have characterized the behaviour of the outer disk by obtaining the ratio of the inner and outer scale-lengths. Here we show the example of NGC0450. Our results suggest that there is an existing general trend of the scale-length ratio: from bluer to redder bands the scale-length ratio decreases, which is in accordance with the idea of the old smooth stellar disk in the outer disk.

Keywords

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Type
Poster Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S262: Stellar Populations – Planning for the Next Decade , August 2009 , pp. 309 - 310
Copyright
Copyright © International Astronomical Union 2010

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