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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20090122T000000
DTEND;TZID=Atlantic/Canary:20090122T010000
UID:iactalks-183
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/183
CREATED:2009-01-22T00:00:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Dark matter in early-type galaxies: a SAURON view
DESCRIPTION:Dark matter in early-type galaxies: a SAURON view\nDr. Anne-Mar
 ie Weijmans\n\nFrom galaxy formation theory we expect galaxies to be embed
 ded in massive dark matter haloes. For spiral and dwarf galaxies this has 
 indeed been observationally confirmed, by modeling the kinematics from the
  large cold gas discs that often surround these galaxies. These gas discs 
 are however rare in elliptical galaxies, so that we have to resort to othe
 r tracers when we want to probe their dark matter haloes, which are not al
 ways easily accessible. As a result, dark haloes for only a handful of ear
 ly-type galaxies have been mapped.\n\nIn this talk I will give an overview
  of the methods that can be used to find dark matter in early-type galaxie
 s. I will then focus on two projects that I worked on with the integral-fi
 eld spectrograph SAURON, using two different methods to constrain the dark
  halo. The first is based on the combination of two-dimensional ionised ga
 s and cold gas kinematics. The second method uses SAURON as a 'photon coll
 ector', to obtain spectra at large radii in galaxies. From these spectra w
 e can not only obtain the velocity profile and construct mass models to co
 nstrain the dark halo, but also infer the properties of the stellar halo p
 opulation. I will show the results from these two projects and discuss som
 e future prospects.\n\n
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