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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Unveiling the structure of barred galaxies at 3.6 mu;m with the spitzer survey of stellar structure in galaxies (S
4
G). I. Disk breaks
Astrophysical Journal, Volume 782, No. 2, Article 64, Year 2014
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Description
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 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 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. © 2014. The American Astronomical Society. All rights reserved. © 2014. The American Astronomical Society. All rights reserved. Printed in the U.S.A.
Authors & Co-Authors
Kim, Taehyun
South Korea, Seoul
Seoul National University
Chile, Santiago
European Southern Observatory Santiago
United States, Charlottesville
National Radio Astronomy Observatory
United States, Pasadena
Carnegie Observatories
Gadotti, Dimitri Alexei
Chile, Santiago
European Southern Observatory Santiago
Sheth, Kartik
United States, Charlottesville
National Radio Astronomy Observatory
Athanassoula, Evangelia
France, Marseille
Laboratoire D'astrophysique de Marseille
Bosma, Albert
France, Marseille
Laboratoire D'astrophysique de Marseille
Lee, Myunggyoon
South Korea, Seoul
Seoul National University
Madore, Barry F.
United States, Pasadena
Carnegie Observatories
Elmegreen, Bruce G.
United States, Yorktown Heights
Ibm Thomas J. Watson Research Center
Knapen, Johan H.
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
Spain, San Cristobal de la Laguna
Universidad de la Laguna
Zaritsky, Dennis
United States, Tucson
The University of Arizona
Ho, Luis C.
United States, Pasadena
Carnegie Observatories
China, Beijing
Peking University
Comerón, Sébastien
Finland, Oulu
Oulun Yliopisto
Finland, Turku
Turun Yliopisto
Holwerda, Benne Willem
Netherlands, Noordwijk Aan Zee
Estec - European Space Research and Technology Centre
Hinz, Joannah L.
United States, Tucson
The University of Arizona
Muñoz-Mateos, Juan Carlos
Chile, Santiago
European Southern Observatory Santiago
United States, Charlottesville
National Radio Astronomy Observatory
Cisternas, Mauricio
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
Spain, San Cristobal de la Laguna
Universidad de la Laguna
Erroz-Ferrer, Santiago
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
Spain, San Cristobal de la Laguna
Universidad de la Laguna
Buta, Ronald James
United States, Tuscaloosa
The University of Alabama
Laurikainen, Eija
Finland, Oulu
Oulun Yliopisto
Finland, Turku
Turun Yliopisto
Salo, Heikki J.
Finland, Oulu
Oulun Yliopisto
Laine, Jarkko
Finland, Oulu
Oulun Yliopisto
Menéndez-Delmestre, Karín
Brazil, Rio de Janeiro
Universidade Federal do Rio de Janeiro
Regan, Michael W.
United States, Baltimore
Space Telescope Science Institute
de Swardt, Bonita
South Africa, Cape Town
South African Astronomical Observatory
Gil De Paz, A. Gll
Spain, Madrid
Universidad Complutense de Madrid
Seibert, Mark
United States, Pasadena
Carnegie Observatories
Mizusawa, T.
United States, Charlottesville
National Radio Astronomy Observatory
United States, Melbourne
Florida Institute of Technology
Statistics
Citations: 41
Authors: 27
Affiliations: 19
Identifiers
Doi:
10.1088/0004-637X/782/2/64
ISSN:
0004637X
e-ISSN:
15384357
Study Design
Cross Sectional Study
Study Approach
Quantitative