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SUMMARY:Growing Along the Cosmic Web: Insights from BCG-Cluster-Filament A
 lignments in J-PLUS
DTSTART:20260423T093000Z
DTEND:20260423T103000Z
DTSTAMP:20260511T070100Z
UID:indico-event-1801@indico.dfa.unipd.it
CONTACT:antonino.marasco@inaf.it
DESCRIPTION:Speakers: Stefano Zarattini (CEFCA Teruel)\n\n\nIn the first p
 art of this talk I will briefly introduce CEFCA and update the status of t
 he J-PLUS and J-PAS surveys\, focusing on how they can help your own scien
 ce and presenting the Open Time Legacy Survey at JST250\, a unique opportu
 nity to observe with the 2.5m telescope and the J-PAS filter set your favo
 urite scientific target.\nIn the second part\, I will discuss the importan
 ce of large-scale alignments\, using a sample of 2018 galaxy clusters iden
 tified in the RedMaPPer catalogue that are also available in the J-PLUS fo
 otprint. For these clusters\, we measured the global position angle (P.A.)
  by modelling the distribution of member galaxies with an elliptical shape
 . Moreover\, we computed the P.A. of each brightest cluster galaxy (BCG) u
 sing the GNUASTRO code. We then estimated the excess of aligned BCGs and u
 sed the power of J-PLUS to investigate how the properties of the BCGs (ste
 llar mass\, global and recent star-formation rate\, and dominance) correla
 te with the alignment signal. Finally\, we used the catalogue of filaments
  and nodes from Chen et al. (2016) to study the alignment between clusters
 /BCGs and their closest cosmic filaments.\nWe find an excess of small P.A.
  differences between BCGs and clusters\, thus confirming previous results 
 from the literature. The alignment signal is stronger for massive and domi
 nant central galaxies\, suggesting that this result is more closely linked
  to the intrinsic properties of the BCGs than to those of the host halo. M
 oreover\, an excess of alignment is also found between clusters and filame
 nts. The alignment signal appears to be robust against environmental varia
 tions. Specifically\, splitting the sample by richness or distance to cosm
 ic structures reveals a persistent excess that does not scale significantl
 y with these quantities.\nThese results suggest that the alignment between
  BCGs and their host clusters reflects the anisotropic assembly history of
  the most massive central galaxies\, which have preferentially grown along
  the directions defined by the cosmic web. This points to a tight co-evolu
 tion between BCGs and large-scale structure\, with implications for our un
 derstanding of BCG formation and the role of environment in shaping galaxy
  properties.\nJoin Zoom Meeting  \n \nhttps://unipd.zoom.us/j/8248288328
 8?pwd=MVvmMWSGaiVrGMyAFOdyQG61OAcI7D.1\nMeeting ID: 824 8288 3288 Passcod
 e: 072472\n\n\nhttps://indico.dfa.unipd.it/event/1801/
LOCATION:Sala Jappelli (Osservatorio astronomico di Padova)
URL:https://indico.dfa.unipd.it/event/1801/
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