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The effects of dust on the derived photometric parameters of disks and bulges in spiral galaxies

Published online by Cambridge University Press:  21 March 2013

B. A. Pastrav ,
C. C. Popescu ,
R. J. Tuffs  and
A. E. Sansom
B. A. Pastrav
Affiliation:
Jeremiah Horrocks Institute, University of Central Lancashire, Preston PR1 2HE, UK email: [email protected]
C. C. Popescu
Affiliation:
Jeremiah Horrocks Institute, University of Central Lancashire, Preston PR1 2HE, UK email: [email protected]
R. J. Tuffs
Affiliation:
Max Planck Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany
A. E. Sansom
Affiliation:
Jeremiah Horrocks Institute, University of Central Lancashire, Preston PR1 2HE, UK email: [email protected]
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Abstract

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Here we present results on the effects of dust on the derived Sérsic index of disks and bulges. This is part of a larger study (see Pastrav et al. 2012a, Pastrav et al. 2012b) that quantifies the dust effects on all photometric parameters, including scale-lengths, axis-ratios, central surface brightness and effective radii of individual and decomposed (from B/D decomposition) disks and bulges. The effects of dust are derived for both broadband and narrow line (Balmer lines) images. The changes in the derived photometric parameters from their intrinsic values (as seen in the absence of dust) were obtained by fitting simulated images of disks and bulges produced using radiative transfer calculations and the model of Popescu et al. (2011). This study follows on the analysis of Möllenhoff et al. (2006), who quantified the effects of dust on the photometry of old stellar disks seen at low and intermediate inclination. We extend the study to disks at all inclinations and we investigate the changes in the photometry of young stellar disks and bulges. For the individual components, in the majority of cases: 1) the dust lowers the Sérsic index from its intrinsic value; 2) the Sérsic index decreases as the inclination and the B band central face-on dust opacity, τBf, increase. For the decomposed disks and bulges, dust slightly increases the Sérsic index as compared with the one derived on individual components (e.g. Fig. 1); this effect is stronger for higher values of the inclination, τBf and B/D.

Keywords

Galaxy: disk — galaxies: bulges — galaxies: spiral — dust — radiative transfer
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S292: Molecular Gas, Dust, and Star Formation in Galaxies , August 2012 , pp. 290
Copyright
Copyright © International Astronomical Union 2013

References

Möllenhoff, C., Popescu, C. C., & Tuffs, R. J. 2006, A&A, 456, 941Google Scholar
Pastrav, B. A., Popescu, C. C., Tuffs, R. J., & Sansom, A. E. 2012a, in Proceedings of the IAU Symp. 284, eds. Tuffs, R. J. & Popescu, C. C., 306CrossRefGoogle Scholar
Pastrav, B. A., Popescu, C. C., Tuffs, R. J., & Sansom, A. E. 2012b, in preparationGoogle Scholar
Popescu, C. C., Tuffs, R. J., Dopita, M.et al. 2011, A&A, 527, A109Google Scholar