Spatially resolved spectroscopy and chemical history of star-forming galaxies in the Hercules cluster: the effects of the environment

Abstract

Spatially resolved spectroscopy has been obtained for a sample of 27 star-forming (SF) galaxies selected from our deep Halpha survey of the Hercules cluster. We have applied spectral synthesis models to all emission-line spectra of this sample using the population synthesis code STARLIGHT. We have obtained fundamental parameters of the stellar components, as the mean metallicity and age, and we have corrected the emission-line spectra for underlying stellar absorption. O/H and N/O gas chemical abundances were obtained using the latest empirical calibrations. The effects of cluster environment on the chemical evolution of galaxies and on their mass-metallicity (MZ) and luminosity-metallicity (LZ) relations were studied combining the derived gas metallicities, the mean stellar metallicities and ages, the masses and luminosities of galaxies and their existing HI data. We have found that our Hercules SF galaxies divide into three main subgroups: a) chemically evolved spirals with truncated ionized-gas disks and nearly flat oxygen gradients, witnessing the effect of ram-pressure stripping, b) chemically evolved dwarfs/irregulars populating the highest local densities, possible products of tidal interactions in preprocessing events, or c) less metallic dwarf galaxies which appear to be "newcomers" to the cluster, experiencing pressure-triggered star-formation. Most Hercules SF galaxies follow well defined MZ and LZ sequences (for both O/H and N/O); though the dwarf/irregular galaxies located at the densest regions appear to be outliers to these global relations, suggesting a physical reason for the dispersion in these fundamental relations. The Hercules cluster appears to be currently assembling via the merger of smaller substructures, providing an ideal laboratory where the local environment has been found to be a key parameter to understand the chemical history of galaxies.

49 pages, 18 figures

References in corpus (19)

• K-corrections and filter transformations in the ultraviolet, optical, and near infrared
• A fundamental relation between mass, SFR and metallicity in local and high redshift galaxies
• The Mass-Metallicity Relation at z~2
• The Origin of the Galaxy Mass-Metallicity Relation and Implications for Galactic Outflows
• Extragalactic chemical abundances: do HII regions and young stars tell the same story? The case of the spiral galaxy NGC 300
• The Mass-Metallicity and Luminosity-Metallicity Relation from DEEP2 at z ~ 0.8
• A Possible Origin of the Mass-Metallicity Relation of Galaxies
• Witnessing galaxy preprocessing in the local Universe: the case of a star-bursting group falling into Abell 1367
• The Different Physical Mechanisms that Drive the Star-Formation Histories of Giant and Dwarf Galaxies
• The Role of Environment in the Mass-Metallicity Relation
• Precision abundance analysis of bright HII galaxies
• A spectroscopic survey of dwarf galaxies in the Coma Cluster: Stellar populations, environment and downsizing
• The environmental dependence of the chemical properties of star-forming galaxies
• VCC 2062: an old Tidal Dwarf Galaxy in the Virgo Cluster?
• SDSS J160531.84+174826.1: A Dwarf Disk Galaxy With An Intermediate-Mass Black Hole
• Chemical Properties of Star Forming Dwarf Galaxies
• Semi-empirical analysis of Sloan Digital Sky Survey galaxies: IV. A nature via nurture scenario for galaxy evolution
• The evolution of dwarf galaxies in the Coma supercluster
• Star-forming galaxies in low-redshift clusters: Comparison of integrated properties of cluster and field galaxies

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• De Re Metallica: The cosmic chemical evolution of galaxies
• The Metallicities of Low Stellar Mass Galaxies and the Scatter in the Mass-Metallicity Relation
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• The Gas-Phase Metallicity of Central and Satellite Galaxies in the SDSS
• Signs of environmental effects on star-forming galaxies in the Spiderweb protocluster at z=2.16
• Mass-Metallicity and Star Formation Rate in Galaxies: a complex relation tuned to stellar age
• Environmental Effects on the Metal Enrichment of Low Mass Galaxies in Nearby Clusters
• The continuous rise of bulges out of galactic disks
• Self-consistent population spectral synthesis with FADO - I. The importance of nebular emission in modelling star-forming galaxies
• A Complete Spectroscopic Census of Abell 2029: A Tale of Three Histories
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