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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20110607T000000
DTEND;TZID=Atlantic/Canary:20110607T010000
UID:iactalks-285
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/285
CREATED:2011-06-07T00:00:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Reconstructing the stellar mass distributions of nearby galaxies us
 ing S4G IRAC 3.6 and 4.5 micron images
DESCRIPTION:Reconstructing the stellar mass distributions of nearby galaxie
 s using S4G IRAC 3.6 and 4.5 micron images\nDr. Sharon Meidt\n\nWith  imag
 ing at 3.6 and 4.5 microns where the light in nearby galaxies is  dominate
 d by old stars, the Spitzer Survey of Nearby Galaxies (S4G)  stands poised
  for an optimal view of stellar mass and structure in the  local Universe.
   I will describe an effort to construct accurate 2D  stellar mass ma
 ps from S4G images, starting with a correction for  non-stellar (e.g. PAH 
 and hot dust) contaminant emission using only the  two S4G images as input
 s; contaminant emission is isolated from the old  stellar light using an I
 ndependent Component Analysis (ICA) technique  designed to separate statis
 tically independent source distributions.  An  inventory of recovered
  contaminants is established via comparison to  the non-stellar emission i
 n archival 8 micron images.  Once these  contaminants are removed, ma
 ps of the underlying distribution of old  stars are revealed that retain a
  high degree of structural information  and exhibit [3.6]-[4.5] colors con
 sistent with those of K and M giants.   Contaminant-free S4G maps con
 structed with this approach should be  ideally suited for tracing the stel
 lar mass in galaxies spanning a range  of morphological properties, dust c
 ontents and star formation  histories. 
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