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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20150908T123000
DTEND;TZID=Atlantic/Canary:20150908T133000
UID:iactalks-805
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/805
CREATED:2015-09-08T12:30:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY: The XLENS Project: Constrain the Initial Mass Function and the Lum
 inous & Dark Matter distribution in massive Early-Type Galaxies
DESCRIPTION: The XLENS Project: Constrain the Initial Mass Function and the
  Luminous & Dark Matter distribution in massive Early-Type Galaxies\nDr. C
 hiara Spiniello\n\nI will present results from The X-Shooter Lens Survey (
 XLENS). With XLENS we are unambiguously separate the stellar from the dark
 -matter content in the internal region of lens early-type galaxies (ETGs) 
 to understand their interplay and to probe directly their formation and dy
 namical evolution. We combine precise strong gravitational lensing and dyn
 amical constraints on the mass distribution with high signal-to-noise spec
 troscopy in the entire rest-frame visible to the NIR.In this talk I will p
 resent results obtained on a sample of very massive lens ETGs from the SLA
 CS Survey, with velocity dispersions greater than 250 km/s and redshift&gt
 ;0.1.\nFirst I will show how to constrain the low mass  end of the Initial
  Mass Function (IMF)directly from galaxy optical  spectra using a new set 
 of non-degenerate optical spectroscopic indices  which are strong in cool 
 giants and dwarfs and almost absent in main  sequence stars (Spiniello et 
 al., 2014a). I will present unambiguous  evidence that the low-mass end of
  the IMF is not universal. Then, I will  demonstrate that the combination 
 of this SSP modelling with a fully  self-consistent joint lensing+dynamics
  analysis (Barnabè et al. 2012)  allows us to disentangle IMF slope
  variations from internal dark-matter  variations and, for the first time 
 ever, to contemporary put constrains  on the IMF cutoff mass (Barnab&egrav
 e; et al., 2013, Spiniello et al., in  prep).
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