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2013MNRAS.434.3310S - Mon. Not. R. Astron. Soc., 434, 3310-3321 (2013/October-1)
VGS31b: a highly inclined ring along a filament in a void. Implication for the cold accretion.
SPAVONE M. and IODICE E.
Abstract (from CDS):
The main aim of this work is to address the most reliable formation scenario for this object, by comparing the observed properties, i.e. structure, baryonic mass, kinematics and chemical abundances, with the theoretical predictions. In particular, we have used archival spectroscopic data, to derive the metallicity in the ring: we found a very low, sub-solar average value of Z = 0.3Z☉, comparable with other polar ring/disc galaxies, but lower than those measured for ordinary spirals of similar luminosity. The study of the chemical abundances in polar ring/disc galaxies and related objects has received an increasing attention in recent years, since it has revealed to be a key-parameter to disentangle among the formation scenarios suggested for this class of objects: major merging, tidal accretion or cold accretion. In this work, we check the cold accretion of gas through a `cosmic filament' as a possible scenario for the formation of the ring-like structure in VGS31b.
Abstract Copyright: © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)
Journal keyword(s): methods: data analysis - galaxies: abundances - galaxies: evolution - galaxies: formation - galaxies: individual: MRK1477 - galaxies: peculiar
Simbad objects: 10
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