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25 April 2024 |
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The impact of bars on disk breaks as probed by S4G imaging | | J. C. Muñoz-Mateos
; K. Sheth
; A. Gil de Paz
; S. E. Meidt
; E. Athanassoula
; A. Bosma
; S. Comerón
; D. M. Elmegreen
; B. G. Elmegreen
; S. Erroz-Ferrer
; D. A. Gadotti
; J. L. Hinz
; L. C. Ho
; B. Holwerda
; T. H. Jarrett
; T. Kim
; J. H. Knapen
; J. Laine
; E. Laurikainen
; B. F. Madore
; K. Menendez-Delmestre
; T. Mizusawa
; M. Regan
; H. Salo
; E. Schinnerer
; M. Seibert
; R. Skibba
; D. Zaritsky
; | | Date: |
22 Apr 2013 | | Abstract: | We have analyzed the radial distribution of old stars in a sample of 218
nearby face-on disks, using deep 3.6um images from the Spitzer Survey of
Stellar Structure in Galaxies (S4G). 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 case of barred galaxies, the ratio between the break and
the bar radii (Rbr/Rbar) depends strongly on the total stellar mass of the
galaxy. For galaxies more massive than 10^10 Msun, the distribution is bimodal,
peaking at Rbr/Rbar~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 10^10 Msun, breaks are found up to ~10 Rbar, 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-axysymmetric features can be responsible not only for those breaks at 2
Rbar, but also for many of those found at larger radii. | | Source: | arXiv, 1304.6083 | | Services: | Forum | Review | PDF | Favorites | |
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