The thick disk in the galaxy NGC 4244 from S^(4)G imaging



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Gil de Paz, Armando and Muñoz Mateos, Juan Carlos and otros, ... (2011) The thick disk in the galaxy NGC 4244 from S^(4)G imaging. Astrophysical journal, 729 (1). ISSN 0004-637X

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If thick disks are ubiquitous and a natural product of disk galaxy formation and/or evolution processes, all undisturbed galaxies that have evolved during a significant fraction of a Hubble time should have a thick disk. The late-type spiral galaxy NGC 4244 has been reported as the only nearby edge-on galaxy without a confirmed thick disk. Using data from the Spitzer Survey of Stellar Structure in Galaxies (S^(4)G) we have identified signs of two disk components in this galaxy. The asymmetries between the light profiles on both sides of the mid-plane of NGC 4244 can be explained by a combination of the galaxy not being perfectly edge-on and a certain degree of opacity of the thin disk. We argue that the subtlety of the thick disk is a consequence of either a limited secular evolution in NGC 4244, a small fraction of stellar material in the fragments which built the galaxy, or a high amount of gaseous accretion after the formation of the galaxy.

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© 2011. The American Astronomical Society. All rights reserved.
Artículo firmado por 19 autores.
The authors thank the entire S^(4)G team for their efforts in this project. We thank our anonymous referee for giving useful advice which improved the quality of this paper. We thank Inma Martínez Valpuesta for her useful comments. We are grateful to the dedicated staff at the Spitzer Science Center for their help and support in planning and execution of this Exploration Science program. We also gratefully acknowledge support from NASA JPL/Spitzer grant RSA 1374189 provided for the S^(4)G project. K. M. D. is supported by an NSF Astronomy and Astrophysics Postdoctoral Fellowship under award AST-0802399. E. A. and A. B. thank the Centre National d'Etudes Spatiales for financial support.

Uncontrolled Keywords:On spiral galaxies; Telescope advanced camera; Dark-matter universe; Space-telescope; Surface-photometry; Galactic disks; H-alpha; High-redshift; Evolution; Emission
Subjects:Sciences > Physics > Astrophysics
Sciences > Physics > Astronomy
ID Code:35471
Deposited On:02 Feb 2016 14:34
Last Modified:10 Dec 2018 15:05

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