Environmental imprint on galaxy chemical enrichment - INSPIRE

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Environmental imprint on galaxy chemical enrichment

Nov, 2012

6 pages

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1211.1527 [astro-ph.CO]

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Abstract: (arXiv)

Recent results are presented on the metal enrichment of low-mass star-forming (SF) galaxies in local Universe clusters. The environmental effects on the chemical evolution of these galaxies are discussed. We have used spectroscopic data from the SDSSIII-DR8 and we have derived the gas-phase O/H and N/O abundances. We have then examined the Mass-Metallicity Relation (MZR) of this sample of cluster galaxies, and we have found well defined sequences. A flattening of the slope of these sequences has been observed for galaxies located in the core of the two more massive clusters of the sample, suggesting that the effect of the cluster environment depends both on the galaxy mass and the host cluster mass. Based on these results we explore cluster-specific effects (e.g. ram-pressure stripping, pressure confinement etc), predicted by hydrodynamic models, capable of yielding the observed mass-dependent enhancement of the metallicity.

Note:

6 pages, 2 figures. To appear in 'Highlights of Spanish Astrophysics VII', Proceedings of the X Scientific Meeting held in Valencia, Spain on 2012, July 9-13 (oral contribution)

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