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The ODD offset between the galactic disk and its bar in NGC 3906

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Gil de Paz, Armando and otros, ... (2015) The ODD offset between the galactic disk and its bar in NGC 3906. Astrophysical journal, 808 (1). ISSN 0004-637X

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Official URL: http://dx.doi.org/10.1088/0004-637X/808/1/90

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Abstract

We use mid-infrared 3.6 and 4.5 μm imaging of NGC 3906 from the Spitzer Survey of Stellar Structure in Galaxies (S^4G) to understand the nature of an unusual offset between its stellar bar and the photometric center of an otherwise regular, circular outer stellar disk. We measure an offset of ∼910 pc between the center of the stellar bar and photometric center of the stellar disk; the bar center coincides with the kinematic center of the disk determined from previous HI observations. Although the undisturbed shape of the disk suggests that NGC 3906 has not undergone a significant merger event in its recent history, the most plausible explanation for the observed offset is an interaction. Given the relatively isolated nature of NGC 3906 this interaction could be with dark matter substructure in the galaxy's halo or from a recent interaction with a fast moving neighbor that remains to be identified. Simulations aimed at reproducing the observed offset between the stellar bar/kinematic center of the system and the photometric center of the disk are necessary to confirm this hypothesis and constrain the interaction history of the galaxy.

Item Type:	Article
Additional Information:	© 2015. The American Astronomical Society. Artículo firmado por 30 autores. We thank the anonymous referee for comments and feedback that greatly improved this paper. K. Sheth, J. C. Muñoz Mateos, T. Kim, and B. de Swardt gratefully acknowledge support from the National Radio Astronomy Observatory which is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. BdS also acknowledges the South African National Research Foundation (NRF) for financial support provided for the research presented in this paper. E.D. gratefully acknowledges the support of the Alfred P. Sloan Foundation and the Aspen Center for Physics for their hospitality and support under grant No. PHYS-1066293. E.D. and S.P. acknowledge support provided by the University of Wisconsin-Madison Office of the Vice Chancellor for Research and Graduate Education with funding from the Wisconsin Alumni Research Foundation and NSF Grant No. AST-1211258 and ATP-NASA Grant No. NNX14AP53G. E.A., A.B., A.Gd. P., J.H.K., E.L., E.S. and H.S. acknowledge financial support from the People Programme (Marie Curie Actions) of the European Unions Seventh Framework Programme FP7/2007-2013/under REA grant agreement number PITN-GA-2011-289313 to the DAGAL network. E.A. and A.B. also ackowledge financial support from the CNES (Centre National d´Etudes Spatiales-France) and from the Programme National de Cosmologie et Galaxies (PNCG) of CNRS/INSU, France. J.H.K. acknowledges financial support from the Spanish Ministry of Economy and Competitiveness (MINECO) under grant number AYA2013-41243-P.
Uncontrolled Keywords:	Large-magellanic-cloud; Stellar structure; Galaxies s(4)g; Star-formation; Spitzer survey; Small companions; Gas; Decomposition; Simulations; Parameters
Subjects:	Sciences > Physics > Astrophysics Sciences > Physics > Astronomy
ID Code:	33280
Deposited On:	25 Sep 2015 14:07
Last Modified:	10 Dec 2018 15:05

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