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Resolved maps of stellar mass and SED of galaxies from optical/NIR imaging and SPS models

Published online by Cambridge University Press:  13 April 2010

Stefano Zibetti ,
Stéphane Charlot  and
Hans-Walter Rix
Stefano Zibetti
Affiliation:
Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany email: zibetti@mpia.de, rix@mpia.de
Stéphane Charlot
Affiliation:
Institut d'Astrophysique de Paris, CNRS, Université Pierre & Marie Curie, 98 bis Boulevard Arago, 75014 Paris, France email: charlot@iap.fr
Hans-Walter Rix
Affiliation:
Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany email: zibetti@mpia.de, rix@mpia.de
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Abstract

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We report on the method developed by Zibetti, Charlot & Rix (2009) to construct resolved stellar mass maps of galaxies from optical and NIR imaging. Accurate pixel-by-pixel colour information (specifically g – i and i – H) is converted into stellar mass-to-light ratios with typical accuracy of 30%, based on median likelihoods derived from a Monte Carlo library of 50,000 stellar population synthesis models that include dust and updated TP-AGB phase prescriptions. Hence, surface mass densities are computed. In a pilot study, we analyze 9 galaxies spanning a broad range of morphologies. Among the main results, we find that: i) galaxies appear much smoother in stellar mass maps than at any optical or NIR wavelength; ii) total stellar mass estimates based on unresolved photometry are biased low with respect to the integral of resolved stellar mass maps, by up to 40%, due to dust obscured regions being under-represented in global colours; iii) within a galaxy, on local scales colours correlate with surface stellar mass density; iv) the slope and tightness of this correlation reflect/depend on the morphology of the galaxy.

Keywords

galaxies: general – galaxies: stellar content – galaxies: structure – galaxies: fundamental parameters – galaxies: photometry – techniques: photometric
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S262: Stellar Populations – Planning for the Next Decade , August 2009 , pp. 89 - 92
Copyright
Copyright © International Astronomical Union 2010

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