Globular cluster systems as tracers of the evolutionary history in NGC 3258 and NGC 3268. (arXiv:1812.09364v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Caso_J/0/1/0/all/0/1">Juan Pablo Caso</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bassino_L/0/1/0/all/0/1">Lilia P. Bassino</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Gomez_M/0/1/0/all/0/1">Matías Gómez</a>
We present a new photometric study of NGC 3258 and NGC 3268 globular cluster
systems (GCSs), using images in filters $B,C,V,R,I$ and $z’$, obtained from
four different telescopes. The wide spatial coverage allow us to estimate the
whole extension of both GCSs more precisely than in previous works, and new
values for the richness of GCs subpopulations. We find differences in the
azimuthal distribution between blue (metal-poor) and red (metal-rich) globular
clusters (GCs), and confirm that radial profiles flatten towards the centre of
the galaxies. In both cases we detected a radial gradient in the colour peak of
blue GCs which might be related to the construction of the GCSs. We analyse the
similarities and differences in both GCSs, in the context of the posible
evolutionary histories of the host galaxies. We also obtain photometric
metallicities for a large number of GC candidates around NGC 3258, by applying
multicolour-metallicity relations. These results confirm the bimodal
metallicity distribution.
We present a new photometric study of NGC 3258 and NGC 3268 globular cluster
systems (GCSs), using images in filters $B,C,V,R,I$ and $z’$, obtained from
four different telescopes. The wide spatial coverage allow us to estimate the
whole extension of both GCSs more precisely than in previous works, and new
values for the richness of GCs subpopulations. We find differences in the
azimuthal distribution between blue (metal-poor) and red (metal-rich) globular
clusters (GCs), and confirm that radial profiles flatten towards the centre of
the galaxies. In both cases we detected a radial gradient in the colour peak of
blue GCs which might be related to the construction of the GCSs. We analyse the
similarities and differences in both GCSs, in the context of the posible
evolutionary histories of the host galaxies. We also obtain photometric
metallicities for a large number of GC candidates around NGC 3258, by applying
multicolour-metallicity relations. These results confirm the bimodal
metallicity distribution.
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