The S4G View of Stellar Mass Distributions, Mid-IR Dust, and Evolved, Intermediate-age Stars

Details The S4G View of Stellar Mass Distributions, Mid-IR Dust, and Evolved, Intermediate-age Stars The S4G View of Stellar Mass Distributions, Mid-IR Dust, and Evolved, Intermediate-age Stars

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21720707m&link_type=abstract

American Astronomical Society, AAS Meeting #217, #207.07; Bulletin of the American Astronomical Society, Vol. 43, 2011

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Scientific paper

We describe a technique for constructing accurate 2D maps of the stellar mass distribution in nearby galaxies from S4G 3.6 micron images, for extension to the full S4G sample. To isolate the old stellar light from contaminant emission (e.g. hot dust and the 3.3 PAH feature) in the IRAC 3.6 and 4.5 micron bands we use an ICA technique (fastICA; Hyvarinen 1999 and Hyvarinen & Oja 2000) designed to separate statistically independent source distributions. The technique also removes emission from low mass-to-light evolved objects, such as AGB and RSG stars, leaving a clean, smooth map of the underlying old distribution of light. Final stellar mass maps (post application of a stellar M/L3.6 assigned by the [3.6]-[4.5] color) retain a high degree of structural information and compare well in total mass to other techniques. Within the context of mass and age estimation via SED modelling at high z, we also extract optical-to-mid-IR SEDs of the AGB-dominated, i.e. 1 Gyr old, populations located via ICA-assisted identification, and constrain the typically uncertain fractional contribution of AGB light to the total stellar emission in (rest-frame) NIR bands that plagues age and mass estimation in high z studies.

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