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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20120214T000000
DTEND;TZID=Atlantic/Canary:20120214T010000
UID:iactalks-362
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/362
CREATED:2012-02-14T00:00:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:The integrated galactic IMF - from star clusters to galaxies
DESCRIPTION:The integrated galactic IMF - from star clusters to galaxies\nD
 r. Carsten Weidner\n\nOver the past years observations of young and populo
 us star clusters have shown that the stellar initial mass function (IMF) c
 an be conveniently described by a two-part power-law with an exponent alph
 a2 = 2.3 for stars more massive than about 0.5 Msol and an exponent of alp
 ha1 = 1.3 for less massive stars. A consensus has also emerged that most, 
 if not all, stars form in stellar groups and star clusters, and that the m
 ass function of these can be described as a power-law (the embedded cluste
 r mass function, ECMF) with an exponent beta ~2. These two results imply t
 hat the integrated galactic IMF (IGIMF) for early-type stars cannot be a S
 alpeter power-law, but that they must have a steeper exponent. An applicat
 ion to star-burst galaxies shows that the IGIMF can become top-heavy. This
  has important consequences for the distribution of stellar remnants and f
 or the chemo-dynamical and photometric evolution of galaxies.
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