Universidad de Granada Digibug
 

Repositorio Institucional de la Universidad de Granada >
1.-Investigación >
Departamentos, Grupos de Investigación e Institutos >
Departamento de Física Teórica y del Cosmos >
DFTC - Artículos >

Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/28432

Title: Star formation history of barred disc galaxies
Authors: Sánchez-Blázquez, P.
Ocvirk, P.
Gibson, B. K.
Pérez, Isabel
Peletier, R. F.
Issue Date: 2011
Abstract: We present the first results of a pilot study aimed at understanding the influence of bars on the evolution of galaxy discs through the study of their stellar content. We examine here the kinematics, star formation history, mass-weighted, luminosity-weighted, and single stellar population (SSP) equivalent ages and metallicities for four galaxies ranging from lenticulars to late-type spirals. The data employed extends to 2-3 disc scalelengths, with S/N(A)>50. Several techniques are explored to derive star formation histories and SSP-equivalent parameters, each of which are shown to be compatible. We demostrate that the age-metallicity degeneracy is highly reduced by using spectral fitting techniques --instead of indices-- to derive these parameters. We found that the majority of the stellar mass in our sample is composed of old (~10 Gyr) stars. This is true in the bulge and the disc region, even beyond two disc scalelengths. In the bulge region, we find that the young, dynamically cold, structures produced by the presence of the bar (e.g., nuclear discs or rings) are responsible for shaping the bulges' age and metallicity gradients. In the disc region, a larger fraction of young stars is present in the external parts of the disc compared with the inner disc. The disc growth is, therefore, compatible with a moderate inside-out formation scenario, where the luminosity weighted age changes from ~10 Gyrs in the centre, to ~4 Gyrs at two disc scalelengths, depending upon the galaxy. For two galaxies, we compare the metallicity and age gradients of the disc major axis with that of the bar, finding very important differences. In particular, the stellar population of the bar is more similar to the bulge than to the disc, indicating that, at least in those two galaxies, bars formed long ago and have survived to the present day.
Publisher: Oxford University Press (OUP); Royal Astronomical Society
Keywords: Galaxies
Stellar content
Spiral
Evolution
Abundances
Kinematics and dynamics
URI: http://hdl.handle.net/10481/28432
ISSN: 00035-8711
1365-2966
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Sánchez-Blázquez, P.; et al. Star formation history of barred disc galaxies. Monthly Notices of the Royal Astronomical Society, 415(1): 709-731 (2011). [http://hdl.handle.net/10481/28432]
Appears in Collections:DFTC - Artículos

Files in This Item:

File Description SizeFormat
Sanchez-Blazquez_StarFormation.pdf2.65 MBAdobe PDFView/Open
Recommend this item

This item is licensed under a Creative Commons License
Creative Commons

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! OpenAire compliant DSpace Software Copyright © 2002-2007 MIT and Hewlett-Packard - Feedback

© Universidad de Granada