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VERSION:2.0
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METHOD:PUBLISH
BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20081218T000000
DTEND;TZID=Atlantic/Canary:20081218T010000
UID:iactalks-64
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/64
CREATED:2008-12-18T00:00:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Recovering lenticular galaxies past histories using planetary nebul
 ae kinematics: the case of NGC1023
DESCRIPTION:Recovering lenticular galaxies past histories using planetary n
 ebulae kinematics: the case of NGC1023\nDr. Arianna Cortesi\n\nWe present 
 a detailed study of the lenticular galaxy NGC 1023 kinematics. To perform 
 this analysis we use planetary nebulae (PNe). which can be observed in the
  faint outer regions of the galaxy, where traces of the galaxy past histor
 y are clearly recorded. If the circular speed is equal or lower than the s
 tars velocity dispersion, the system is hot and it is the result of a mino
 r merger. Otherwise, if the stellar motions are rotation dominated at larg
 e radii, a spiral galaxy is the progenitor of the lenticular.  A first att
 empt at such an analysis was undertaken by Noordermeer et al. (2008), who 
 found that the S0 system NGC 1023 has very peculiar kinematics in its disk
 , which do not seem to be consistent with either of the above scenarios.  
 In this paper we show that that result was largely due to a  contamination
  of the disk kinematics by  stars belonging to the spheroidal component or
  accreted from the small companion.  We present a new method based on a mo
 re sophisticated maximum-likelihood analysis that uses a full two-dimensio
 nal disk/spheroid decomposition  to solve simultaneously for both disk and
  spheroid kinematics. This analysis reveal that NGC1023 has the kinematics
  expected  for a stripped spiral galaxy.
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