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The Opacity of Spiral Galaxies from Counts of Distant Background Galaxies

Published online by Cambridge University Press:  26 May 2016

B.W. Holwerda ,
R.A. González ,
R. J. Allen  and
P.C. Van Der Kruit
B.W. Holwerda
Affiliation:
Space Telescope Science Institute, Baltimore, MD 21218, USA Kapteyn Institute, Landleven 12, 9747 AD Groningen, the Netherlands
R.A. González
Affiliation:
Centro de Radioastronomía y Astrofísica, Universidad Nacional Autónoma de México, 58190 Morelia, Michoacán, Mexico
R. J. Allen
Affiliation:
Space Telescope Science Institute, Baltimore, MD 21218, USA
P.C. Van Der Kruit
Affiliation:
Kapteyn Institute, Landleven 12, 9747 AD Groningen, the Netherlands

Abstract

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We have applied the “Synthetic Field Method” on a sample of 20 nearby galaxies in order to determine the opacity of their disks. We present preliminary results on the radial dependence of cold dust absorption for 3 examples. the spirals NGC 4535 and NGC 4725 show significant absorption at a half-light radius. UGC 2302, a LSB galaxy, shows much less opacity.

Type
Part 9: Disks
Information
Symposium - International Astronomical Union , Volume 220: Dark Matter in Galaxies , 2004 , pp. 323 - 324
Copyright
Copyright © Astronomical Society of the Pacific 2004 

References

González, R. A., Allen, R. J., Dirsch, B., Ferguson, H. C., Calzetti, D., & Panagia, N. 1998, ApJ, 506, 152.Google Scholar
González, R. A., Loinard, L., Allen, R. J., & Muller, S. 2003, AJ, 125, 1182.Google Scholar
Holwerda, B. W., Allen, R. J., & van der Kruit, P. C. 2002, ASP Conf. Ser. 273, 337.Google Scholar