RT Journal Article
T1 Unveiling the structure of barred galaxies at 3.6 μm with the spitzer survey of stellar structure in galaxies (S^4G). I. Disk breaks
A1 Kim, Taehyun
A1 Gadotti, Dimitri A.
A1 Sheth, Kartik
A1 Athanassoula, E.
A1 Bosma, Albert
A1 Lee, Myung Gyoon
A1 Madore, Barry F.
A1 Elmegreen, Bruce
A1 Knapen, Johan H.
A1 Zaritsky, Dennis
A1 Ho, Luis C.
A1 Comerón, Sébastien
A1 Holwerda, Benne W.
A1 Hinz, Joannah L.
A1 Muñoz Mateos, Juan Carlos
A1 Cisternas, Mauricio
A1 Erroz Ferrer, Santiago
A1 Buta, Ronald J.
A1 Laurikainen, Eija
A1 Salo, Heikki
A1 Laine, Jarkko
A1 Menéndez-Delmestre, Karín
A1 Regan, Michael W.
A1 Swardt, Bonita de
A1 Gil De Paz, Armando
A1 Seibert, Mark
A1 Mizusawa, Trisha
AB We have performed two-dimensional multicomponent decomposition of 144 local barred spiral galaxies using 3.6 μm images from the Spitzer Survey of Stellar Structure in Galaxies. Our model fit includes up to four components (bulge, disk, bar, and a point source) and, most importantly, takes into account disk breaks. We find that ignoring the disk break and using a single disk scale length in the model fit for Type II (down-bending) disk galaxies can lead to differences of 40% in the disk scale length, 10% in bulge-to-total luminosity ratio (B/T), and 25% in bar-to-total luminosity ratios. We find that for galaxies with B/T ≥ 0.1, the break radius to bar radius, r_br/R_bar, varies between 1 and 3, but as a function of B/T the ratio remains roughly constant. This suggests that in bulge-dominated galaxies the disk break is likely related to the outer Lindblad resonance of the bar and thus moves outward as the bar grows. For galaxies with small bulges, B/T < 0.1, r_br/R_bar spans a wide range from 1 to 6. This suggests that the mechanism that produces the break in these galaxies may be different from that in galaxies with more massive bulges. Consistent with previous studies, we conclude that disk breaks in galaxies with small bulges may originate from bar resonances that may be also coupled with the spiral arms, or be related to star formation thresholds.
PB American Astronomical Society
SN 0004-637X
YR 2014
FD 2014-02-20
LK https://hdl.handle.net/20.500.14352/34984
UL https://hdl.handle.net/20.500.14352/34984
LA eng
NO Unión Europea. FP7
NO National Radio Astronomy Observatory
NO NASA JPL/Spitzer
NO National Research Foundation of Korea (NRF)
NO Korea Government (MEST)
NO Marie Curie Actions of the European Commission
NO Centre National d'Etudes Spatiales
NO National Aeronautics and Space Administration (NASA)
DS Docta Complutense
RD 13 abr 2025