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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20181016T123000
DTEND;TZID=Atlantic/Canary:20181016T133000
UID:iactalks-1196
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1196
CREATED:2018-10-16T12:30:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:The transformation of galaxies in infall cluster regions
DESCRIPTION:The transformation of galaxies in infall cluster regions\nDr. U
 lrike Kuchner\n\nThe cutting off of gas supply in galaxies, whether it is 
 exhausted internally or removed forcibly, can have dramatic consequences a
 nd are thought to build up clusters dominated by an early-type galaxy popu
 lation, as observed in the local Universe. In recent years it has become m
 ore and more obvious that this transformation starts in moderate overdensi
 ties and filaments surrounding and feeding galaxy clusters. Keeping in min
 d that the environment of a galaxy cluster is the result of continuous hie
 rarchical assembly boasting a wide range of substructures of locally dense
  environments, we therefore need to ask: Are the observed galaxy (scaling-
 ) relations due to the timing and physics of cosmological structure format
 ion or due to baryonic physics?To answer this question we need to look bey
 ond the cluster core.We therefore investigated members (down to 10^8.5 M_s
 ol) of a massive galaxy cluster at z=0.44 out to 3 virial radii. Our obser
 vations probe the nearby infall region, central to the topical question of
  “pre-processing”. The smoking gun of this “pre-processi
 ng” are transitional objects, like passive disk galaxies, whose stel
 lar populations and morphologies indicate a recent change in star formatio
 n and/or dynamical history. We find a large number of this virialized popu
 lation at distinct locations. In our exploration of the galaxy stellar mas
 s-size relation (Kuchner+17), we were able to show that the manifestation 
 of the size distribution of the cluster galaxies is due to an outer disk-f
 ading and possible bulge growth that accompanies the varying fraction of s
 tar-forming and quiescent galaxies.Continuing this quest, the Wiliam Hersc
 hel Telescope’s new multi-object survey spectrograph WEAVE will run 
 a dedicated survey that focuses on this question of “pre-processing&
 rdquo;. WEAVE will map 16 nearby galaxy clusters and their filamentary str
 ucture of infalling galaxies out to 5 viral radii. This will allow us to c
 haracterize the onset and continuation of galaxy transformation during the
 ir infall process toward the cluster center.
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