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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 693554.0, MPI für Astronomie / Publikationen_mpia
The impact of bars on disk breaks as probed by S4G imaging
Authors:Muñoz-Mateos, J. C.; Sheth, K.; Gil de Paz, A.; Meidt, S.; Athanassoula, E.; Bosma, A.; Comerón, S.; Elmegreen, D. M.; Elmegreen, B. G.; Erroz-Ferrer, S.; Gadotti, D. A.; Hinz, J. L.; Ho, L. C.; Holwerda, B.; Jarrett, T. H.; Kim, T.; Knapen, J. H.; Laine, J.; Laurikainen, E.; Madore, B. F.; Menendez-Delmestre, K.; Mizusawa, T.; Regan, M.; Salo, H.; Schinnerer, E.; Seibert, M.; Skibba, R.; Zaritsky, D.
Date of Publication (YYYY-MM-DD):2013
Title of Journal:The Astrophysical Journal
Issue / Number:1
Start Page:id. 59 (30 pp)
Audience:Not Specified
Abstract / Description:We have analyzed the radial distribution of old stars in a sample of 218 nearby face-on disks, using deep 3.6 μm images from the Spitzer Survey of Stellar Structure in Galaxies. In particular, we have studied the structural properties of those disks with a broken or down-bending profile. We find that, on average, disks with a genuine single-exponential profile have a scale length and a central surface brightness which are intermediate to those of the inner and outer components of a down-bending disk with the same total stellar mass. In the particular case of barred galaxies, the ratio between the break and the bar radii (R br/R bar) depends strongly on the total stellar mass of the galaxy. For galaxies more massive than 1010 M , the distribution is bimodal, peaking at R br/R bar ~ 2 and ~3.5. The first peak, which is the most populated one, is linked to the outer Lindblad resonance of the bar, whereas the second one is consistent with a dynamical coupling between the bar and the spiral pattern. For galaxies below 1010 M , breaks are found up to ~10 R bar, but we show that they could still be caused by resonances given the rising nature of rotation curves in these low-mass disks. While not ruling out star formation thresholds, our results imply that radial stellar migration induced by non-axisymmetric features can be responsible not only for those breaks at ~2 R bar, but also for many of those found at larger radii.
Free Keywords:galaxies: evolution; galaxies: photometry; galaxies: spiral; galaxies: stellar content; galaxies: structure
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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