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No direct coupling between bending of galaxy disc stellar age and light profiles

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Marino, Raffaella Anna and otros, ... (2016) No direct coupling between bending of galaxy disc stellar age and light profiles. Monthly notices of the Royal Astronomical Society, 456 (1). L35-L39. ISSN 0035-8711

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Official URL: http://dx.doi.org/10.1093/mnrasl/slv174




Abstract

We study the stellar properties of 44 face-on spiral galaxies from the Calar Alto Legacy Integral Field Area survey via full spectrum fitting techniques. We compare the age profiles with the surface brightness distribution in order to highlight differences between profile types (type I, exponential profile; and II, down-bending profile). We observe an upturn ('U-shape') in the age profiles for 17 out of these 44 galaxies with reliable stellar information up to their outer parts. This 'U-shape' is not a unique feature for type II galaxies but can be observed in type I as well. These findings suggest that the mechanisms shaping the surface brightness and stellar population distributions are not directly coupled. This upturn in age is only observable in the light-weighted profiles while it flattens out in the mass-weighted profiles. Given recent results on the outer parts of nearby systems and the results presented in this Letter, one of the most plausible explanations for the age upturn is an early formation of the entire disc(~10 Gyr ago) followed by an inside-out quenching of the star formation.


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© 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. Artículo firmado por 21 autores. This Letter is based on data from the CALIFA Survey (http://califa.caha.es), funded by the Spanish Ministry of Science (grant ICTS-2009-10), and the Centro Astronómico Hispano-Alemán. This research has been partly supported by the Spanish Ministry of Science and Innovation under grants AYA2011-24728, AYA2013-48226-C3-1-P and Consolider-Ingenio CSD2010-00064; and by the Junta de Andalucía (FQM-108). TRL thanks the support of the Spanish Ministerio de Educación, Cultura y Deporte (FPU fellowship). We acknowledge the usage of the HyperLeda data base (http://leda.univ-lyon1.fr) and SDSS data (http://www.sdss.org/collaboration/citing-sdss/).

Uncontrolled Keywords:Resolution galactic spectra; Emission-line kinematics; Star-formation history; Maximum a-posteriori; Spiral galaxies; Radial migration; Sauron project; Data release; Populations; Absorption
Subjects:Sciences > Physics > Astrophysics
Sciences > Physics > Astronomy
ID Code:35770
Deposited On:17 Feb 2016 15:51
Last Modified:10 Dec 2018 15:04

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