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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The impact of bars on disk breaks as probed by S
4
G imaging
Astrophysical Journal, Volume 771, No. 1, Article 59, Year 2013
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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. © 2013. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Muñoz-Mateos, Juan Carlos
United States, Charlottesville
National Radio Astronomy Observatory
Sheth, Kartik
United States, Charlottesville
National Radio Astronomy Observatory
Gil De Paz, A. Gll
Spain, Madrid
Universidad Complutense de Madrid
Meidt, Sharon E.
Germany, Heidelberg
Max Planck Institute for Astronomy
Athanassoula, Evangelia
France, Marseille
Laboratoire D'astrophysique de Marseille
Bosma, Albert
France, Marseille
Laboratoire D'astrophysique de Marseille
Comerón, Sébastien
Finland, Oulu
Oulun Yliopisto
Elmegreen, Debra Meloy
United States, Poughkeepsie
Vassar College
Elmegreen, Bruce G.
United States, Yorktown Heights
Ibm Thomas J. Watson Research Center
Erroz-Ferrer, Santiago
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
Spain, San Cristobal de la Laguna
Universidad de la Laguna
Gadotti, Dimitri Alexei
Chile, Santiago
European Southern Observatory Santiago
Hinz, Joannah L.
United States, Tucson
The University of Arizona
Ho, Luis C.
United States, Pasadena
Carnegie Observatories
Holwerda, Benne Willem
Netherlands, Noordwijk Aan Zee
Estec - European Space Research and Technology Centre
Jarrett, Thomas H.
South Africa, Cape Town
University of Cape Town
Kim, Taehyun
United States, Charlottesville
National Radio Astronomy Observatory
Chile, Santiago
European Southern Observatory Santiago
United States, Pasadena
Carnegie Observatories
South Korea, Seoul
Seoul National University
Knapen, Johan H.
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
Spain, San Cristobal de la Laguna
Universidad de la Laguna
Laine, Jarkko
Finland, Oulu
Oulun Yliopisto
Laurikainen, Eija
Finland, Oulu
Oulun Yliopisto
Finland, Turku
Turun Yliopisto
Madore, Barry F.
United States, Pasadena
Carnegie Observatories
Menéndez-Delmestre, Karín
Brazil, Rio de Janeiro
Universidade Federal do Rio de Janeiro
Mizusawa, T.
United States, Charlottesville
National Radio Astronomy Observatory
United States, Melbourne
Florida Institute of Technology
Regan, Michael W.
United States, Baltimore
Space Telescope Science Institute
Salo, Heikki J.
Finland, Oulu
Oulun Yliopisto
Schinnerer, Eva
Germany, Heidelberg
Max Planck Institute for Astronomy
Seibert, Mark
United States, Pasadena
Carnegie Observatories
Skibba, Ramin A.
United States, Tucson
The University of Arizona
Zaritsky, Dennis
United States, Tucson
The University of Arizona
Statistics
Citations: 79
Authors: 28
Affiliations: 19
Identifiers
Doi:
10.1088/0004-637X/771/1/59
ISSN:
0004637X
e-ISSN:
15384357
Study Design
Cross Sectional Study
Study Approach
Quantitative