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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20160602T103000
DTEND;TZID=Atlantic/Canary:20160602T113000
UID:iactalks-927
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/927
CREATED:2016-06-02T10:30:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:The interplay between baryons and dark matter in galaxies
DESCRIPTION:The interplay between baryons and dark matter in galaxies\nDr. 
 Mariya Lyubenova\n\nTests of the concordance cold dark matter model on the
   scale of galaxies are so far inconclusive due to our poor understanding 
  of the interplay between baryons and dark matter (DM). Two critical  limi
 tations in previous efforts to disentangle the baryonic and DM  distributi
 ons have been the lack of (i) two-dimensional, spatially  complete and rad
 ially extended kinematics to infer the total mass  distribution, and (ii) 
 coverage in wavelength to robustly constrain the  baryonic mass distributi
 on and isolate the DM contribution. Both are now  provided by existing int
 egral-field spectroscopic data from the CALIFA  survey of a statistically 
 well-defined sample of ~600 nearby galaxies of  all Hubble types. We apply
  dynamical and stellar population modelling  in a homogeneous way to the s
 ame data. In this way we for the first time  constrain both the normalisat
 ion (ratio of dwarf to giant stars) and  shape (single versus broken power
 -law slope) of the stellar initial mass  function (IMF). We then robustly 
 characterise the mass distribution of  galaxies, from dwarf-star dominance
  at the high-mass end to dark matter  excess in low-mass spirals. In this 
 way, CALIFA yields physical insights  into the baryonic and DM interplay f
 or a statistically well-defined  sample of nearby galaxies, providing in t
 urn crucial constraints on  galaxy formation and evolution models.
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