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Dust effects on the derived Sérsic indexes of disks and bulges in spiral galaxies

Published online by Cambridge University Press:  17 August 2012

Bogdan A. Pastrav ,
Cristina C. Popescu ,
Richard J. Tuffs  and
Anne E. Sansom
Bogdan A. Pastrav
Affiliation:
Jeremiah Horrocks Institute, University of Central Lancashire, Preston PR1 2HE, UK email: bapastrav@uclan.ac.uk
Cristina C. Popescu
Affiliation:
Jeremiah Horrocks Institute, University of Central Lancashire, Preston PR1 2HE, UK email: bapastrav@uclan.ac.uk
Richard J. Tuffs
Affiliation:
Max Planck Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany
Anne E. Sansom
Affiliation:
Jeremiah Horrocks Institute, University of Central Lancashire, Preston PR1 2HE, UK email: bapastrav@uclan.ac.uk
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Abstract

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We present a theoretical study that quantifies the effect of dust on the derived Sérsic indexes of disks and bulges. The changes in the derived parameters from their intrinsic values (as seen in the absence of dust) were obtained by fitting Sérsic distributions on simulated images of disks and bulges produced using radiative transfer calculations and the model of Popescu et al. (2011). We found that dust has the effect of lowering the measured Sérsic index in most cases, with stronger effects for disks and bulges seen through more optically thick lines of sight.

Keywords

Galaxy: diskgalaxies: bulgesGalaxy: fundamental parametersgalaxies: spiralgalaxies: ISMgalaxies: structure(ISM:) dustextinctionradiative transfer

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