The colors of bulges and disks in the core and outskirts of galaxy clusters. (arXiv:2012.12480v2 [astro-ph.GA] UPDATED)
<a href="http://arxiv.org/find/astro-ph/1/au:+Barsanti_S/0/1/0/all/0/1">S. Barsanti</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Owers_M/0/1/0/all/0/1">M. S. Owers</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+McDermid_R/0/1/0/all/0/1">R. M. McDermid</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bekki_K/0/1/0/all/0/1">K. Bekki</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bryant_J/0/1/0/all/0/1">J. J. Bryant</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Croom_S/0/1/0/all/0/1">S. M. Croom</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Oh_S/0/1/0/all/0/1">S. Oh</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Robotham_A/0/1/0/all/0/1">A. S. G. Robotham</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Scott_N/0/1/0/all/0/1">N. Scott</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Sande_J/0/1/0/all/0/1">J. van de Sande</a>
The role of the environment on the formation of S0 galaxies is still not well
understood, specifically in the outskirts of galaxy clusters. We study eight
low-redshift clusters, analyzing galaxy members up to cluster-centric distances
$sim2.5,R_{200}$. We perform 2D photometric bulge-disk decomposition in the
$g$-, $r$- and $i$-bands from which we identify 469 double-component galaxies.
We analyze separately the colors of the bulges and the disks and their
dependence on the projected cluster-centric distance and on the local galaxy
density. For our sample of cluster S0 galaxies, we find that bulges are redder
than their surrounding disks, show a significant color-magnitude trend, and
have colors that do not correlate with environment metrics. On the other hand,
the disks associated with our cluster S0s become significantly bluer with
increasing cluster-centric radius, but show no evidence for a color-magnitude
relation. The disk color-radius relation is mainly driven by galaxies in the
cluster core at $0leq R/ R_{200}<0.5$. No significant difference is found for
the disk colors of backsplash and infalling galaxies in the projected phase
space. Beyond $R_{200}$, the disk colors do not change with the local galaxy
density, indicating that the colors of double-component galaxies are not
affected by pre-processing. A significant color-density relation is observed
for single-component disk-dominated galaxies beyond $R_{200}$. We conclude that
the formation of cluster S0 galaxies is primarily driven by cluster core
processes acting on the disks, while evidence of pre-processing is found for
single-component disk-dominated galaxies.
We publicly release the data from the bulge-disk decomposition.
The role of the environment on the formation of S0 galaxies is still not well
understood, specifically in the outskirts of galaxy clusters. We study eight
low-redshift clusters, analyzing galaxy members up to cluster-centric distances
$sim2.5,R_{200}$. We perform 2D photometric bulge-disk decomposition in the
$g$-, $r$- and $i$-bands from which we identify 469 double-component galaxies.
We analyze separately the colors of the bulges and the disks and their
dependence on the projected cluster-centric distance and on the local galaxy
density. For our sample of cluster S0 galaxies, we find that bulges are redder
than their surrounding disks, show a significant color-magnitude trend, and
have colors that do not correlate with environment metrics. On the other hand,
the disks associated with our cluster S0s become significantly bluer with
increasing cluster-centric radius, but show no evidence for a color-magnitude
relation. The disk color-radius relation is mainly driven by galaxies in the
cluster core at $0leq R/ R_{200}<0.5$. No significant difference is found for
the disk colors of backsplash and infalling galaxies in the projected phase
space. Beyond $R_{200}$, the disk colors do not change with the local galaxy
density, indicating that the colors of double-component galaxies are not
affected by pre-processing. A significant color-density relation is observed
for single-component disk-dominated galaxies beyond $R_{200}$. We conclude that
the formation of cluster S0 galaxies is primarily driven by cluster core
processes acting on the disks, while evidence of pre-processing is found for
single-component disk-dominated galaxies.
We publicly release the data from the bulge-disk decomposition.
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