Constraining the formation of inner bars: photometry, kinematics and stellar populations in NGC 357

Bibcode
2012MNRAS.420.1092D
DOI
10.1111/j.1365-2966.2011.20100.x
de Lorenzo-Cáceres, A.; Vazdekis, A.; Aguerri, J. A. L.; Corsini, E. M.; Debattista, Victor P.
Bibliographical reference

Monthly Notices of the Royal Astronomical Society, Volume 420, Issue 2, pp. 1092-1106.

Advertised on:
2
2012
Journal
Monthly Notices of the Royal Astronomical Society
Number of authors
5
IAC number of authors
3
Citations
33
Refereed citations
31
Description
Double-barred galaxies are common in the local Universe, with approximately one-third of barred spirals hosting a smaller, inner bar. Nested bars have been proposed as a mechanism to transport gas to the very central regions of the galaxy, trigger star formation and contribute to the growth of the bulge. To test this idea, we perform for the first time a detailed analysis of the photometry, kinematics and stellar populations of a double-barred galaxy: NGC 357. We find that this galaxy is either hosting a pseudo-bulge or a classical bulge together with an inner disc. We compare the relative mean luminosity-weighted age, metallicity and α-enhancement between the (pseudo-)bulge, inner bar and outer bar, finding that the three structures are nearly coeval and old. Moreover, the bulge and inner bar present the same metallicity and overabundance, whereas the outer bar tends to be less metal rich and more α-enhanced. These results point out that, rather than the classical secular scenario in which gas and star formation play a major role, the redistribution of the existing stars is driving the formation of the inner structures. Based on observations carried out at the European Southern Observatory (ESO 70.B-0338).
Related projects
Abell 370 is located approximately 4 billion light-years away in the constellation Cetus, the Sea Monster
Galaxy Evolution in Clusters of Galaxies

Galaxies in the universe can be located in different environments, some of them are isolated or in low density regions and they are usually called field galaxies. The others can be located in galaxy associations, going from loose groups to clusters or even superclusters of galaxies. One of the foremost challenges of the modern Astrophysics is to

Jairo
Méndez Abreu
In progress
Abell 370 is located approximately 4 billion light-years away in the constellation Cetus, the Sea Monster
Galaxy Evolution in Clusters of Galaxies

Galaxies in the universe can be located in different environments, some of them are isolated or in low density regions and they are usually called field galaxies. The others can be located in galaxy associations, going from loose groups to clusters or even superclusters of galaxies. One of the foremost challenges of the modern Astrophysics is to

Jairo
Méndez Abreu
In progress
Group members
Traces of Galaxy Formation: Stellar populations, Dynamics and Morphology

We are a large, diverse, and very active research group aiming to provide a comprehensive picture for the formation of galaxies in the Universe. Rooted in detailed stellar population analysis, we are constantly exploring and developing new tools and ideas to understand how galaxies came to be what we now observe.

Ignacio
Martín Navarro
In progress
Group members
Traces of Galaxy Formation: Stellar populations, Dynamics and Morphology

We are a large, diverse, and very active research group aiming to provide a comprehensive picture for the formation of galaxies in the Universe. Rooted in detailed stellar population analysis, we are constantly exploring and developing new tools and ideas to understand how galaxies came to be what we now observe.

Ignacio
Martín Navarro
In progress
Type
Refereed
Galaxies
Photometry
Formation & Evolution of Galaxies (FYEG)

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