On Synchronized Globular Cluster Formation over Supra-galactic Scales: A Virgo-Centaurus Group Connection. (arXiv:2210.06426v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Forte_J/0/1/0/all/0/1">Juan Carlos Forte</a>
This work reports the detection of a multi peaked colour pattern in the
integrated colours distribution of globular clusters associated to the giant
elliptical galaxy NGC 4486, using Next Generation Virgo Survey data. This
feature is imprinted on the well known bimodal colour distribution of these
clusters. Remarkably, the pattern is similar to that found in previous works
based on photometry from the HST Advanced Camera Virgo Survey, in less massive
Virgo galaxies. This characteristic can be traced up to to 45 arcmin (217 Kpc)
in galactocentric radius. This suggests that globular cluster formation in
Virgo has been regulated, at least partially, by a collective process composed
by several discrete events, working on spatial scales comparable to the size of
the galaxy cluster. Furthermore, the presence of a similar colour pattern in
NGC 5128, at the outskirsts of the Virgo Super-cluster, poses an intriguing
question about the spatial scale of the phenomenon. The nature of the process
that leads to the colour pattern is unknown. However, energetic events
connected with galaxy or sub-galaxy cluster mergers and SMBH activity, in the
early Universe, appear as possible candidates to explain an eventual
enhancement/quenching of the globular clusters formation, reflected in the
modulation of their integrated colours. Such events, presumably, may also have
had an impact on the whole star formation history in Virgo galaxies.
This work reports the detection of a multi peaked colour pattern in the
integrated colours distribution of globular clusters associated to the giant
elliptical galaxy NGC 4486, using Next Generation Virgo Survey data. This
feature is imprinted on the well known bimodal colour distribution of these
clusters. Remarkably, the pattern is similar to that found in previous works
based on photometry from the HST Advanced Camera Virgo Survey, in less massive
Virgo galaxies. This characteristic can be traced up to to 45 arcmin (217 Kpc)
in galactocentric radius. This suggests that globular cluster formation in
Virgo has been regulated, at least partially, by a collective process composed
by several discrete events, working on spatial scales comparable to the size of
the galaxy cluster. Furthermore, the presence of a similar colour pattern in
NGC 5128, at the outskirsts of the Virgo Super-cluster, poses an intriguing
question about the spatial scale of the phenomenon. The nature of the process
that leads to the colour pattern is unknown. However, energetic events
connected with galaxy or sub-galaxy cluster mergers and SMBH activity, in the
early Universe, appear as possible candidates to explain an eventual
enhancement/quenching of the globular clusters formation, reflected in the
modulation of their integrated colours. Such events, presumably, may also have
had an impact on the whole star formation history in Virgo galaxies.
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