Multi-wavelength characterization of the outskirts of spiral galaxies
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...
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| Veröffentlicht in: | Proceedings of the International Astronomical Union 2009-08, Vol.5 (S262), p.309-310 |
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| creator | Bakos, Judit Trujillo, Ignacio |
| description | 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. |
| doi_str_mv | 10.1017/S174392131000298X |
| format | Article |
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| source | Cambridge University Press Journals Complete |
| subjects | Astronomy Astrophysics Poster Papers Spectrum analysis Star & galaxy formation Stars & galaxies |
| title | Multi-wavelength characterization of the outskirts of spiral galaxies |
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