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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20190620T103000
DTEND;TZID=Atlantic/Canary:20190620T113000
UID:iactalks-1308
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1308
CREATED:2019-06-20T10:30:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Galaxy structure and the galaxy-halo connection
DESCRIPTION:Galaxy structure and the galaxy-halo connection\nLorenzo Zanisi
 \n\nThe mass and structural assembly of galaxies is still a matter of inte
 nse debate. Current theoretical models predict the existence of a linear r
 elationship between galaxy effective radius (R_e ) and the host dark matte
 r halo virial radius (R_h ).By making use of accurate and transparent semi
 -empirical models compared to the size distributions of central galaxies f
 rom the Sloan Digital Sky Survey, I will provide robust constraints on the
  normalization and scatter of the Re − Rh relation in the framework 
 of Halo Abundance Matching. Specifically, I will explore the parameter spa
 ceof models in which the relation between galaxy size and halo radius is m
 ediated by the dynamical or structural properties of the dark matter halo.
  Within the same framework, I will also discuss the size evolution of Ultr
 a Massive Galaxies, which is still poorly understood.I will show that the 
 data require extremely tight relations for both early-type and late type g
 alaxies, especially for more massive galaxies. These constraints challenge
  models based on angular momentum conservation, which predict significantl
 y wider distributions of galaxy sizes and no trend with stellar mass. I wi
 ll also show that a constant Re-Rh relation is able to reproduce the size 
 evolution of Ultra Massive Galaxies and provide a framework to the size ev
 olution of galaxies with any mass.I will conclude showing that the normali
 zation and scatter of the size-halo radius relation of both early- and lat
 e-type galaxies might be consistent with pure merger models, though a comp
 lete picture for the structural evolution of galaxies remains elusive.
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