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Advances in AstronomyVolume 2013 2013, Article ID 627867, 14 pages

Review ArticleInstituto Nacional de Astrofísica, Óptica y Electrónica, Luis E. Erro 1, 72840 Tonantzintla, PUE, Mexico

Received 7 August 2013; Accepted 27 September 2013

Academic Editor: José Manuel Vílchez Medina

Copyright © 2013 Fernando Fabián Rosales-Ortega. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A new generation of wide-field emission-line surveys based on integral field units IFU is allowing us to obtain spatially resolved information of the gas-phase emission in nearby late-type galaxies, based on large samples of HII regions and full two-dimensional coverage. These observations are allowing us to discover and characterise abundance differentials between galactic substructures and new scaling relations with global physical properties. Here I review some highlights of our current studies employing this technique: 1 the case study of NGC 628, the largest galaxy ever sampled with an IFU; 2 a statistical approach to the abundance gradients of spiral galaxies, which indicates a universal radial gradient for oxygen abundance; and 3 the discovery of a new scaling relation of HII regions in spiral galaxies, the local mass-metallicity relation of star-forming galaxies. The observational properties and constrains found in local galaxies using this new technique will allow us to interpret the gas-phase abundance of analogue high-z systems.





Autor: Fernando Fabián Rosales-Ortega

Fuente: https://www.hindawi.com/



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