Advertisement

THE OPACITY OF SPIRAL GALAXY DISKS

  • Benne W. Holwerda
  • R.A. González
  • Ronald J. Allen
  • P.C. van der Kruit
Part of the Astrophysics and Space Science Proceedings book series (ASSSP)

Abstract

The opacity of foreground spiral disks can be probed from the number of distant galaxies seen through them. To calibrate this number for effects other than the dust extinction, Gonzalez et al. (1998) developed the “Synthetic Field Method”. A synthetic field is an extincted Hubble Deep Field added to the science field. The relation between the dimming and the number of retrieved synthetic galaxies calibrates the number found in the science field. Here we present results from counts in 32 HST/WFPC2 fields. The relation between opacity and radius, arm and disk, surface brightness and Hi are presented. The opacity is found to be caused by a clumpy distribution of clouds in the disk. The brighter parts of the disk –the center and arms– are also the more opaque ones. The dust distribution in spiral disks is found to be more extended than the stellar disk. A comparison between Hi column densities and opacity shows little relation between the two.

Keywords

Column Density Surface Brightness Dust Cloud Stellar Disk Distant Galaxy 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Bell, E. F. and de Jong, R. S. 2001, ApJ, 550, 212CrossRefADSGoogle Scholar
  2. Cuillandre, J., Lequeux, J., Allen, R. J., Mellier, Y., and Bertin, E. 2001, ApJ, 554, 190CrossRefADSGoogle Scholar
  3. de Jong, R. S., Bell E. F. 2006, these proceedings, p. 107Google Scholar
  4. Domingue, D. L., Keel, W. C., and White, R. E. 2000, ApJ, 545, 171CrossRefADSGoogle Scholar
  5. Dopita, M. 2006, these proceedings, p. 328Google Scholar
  6. Elmegreen, D. M. 1980, ApJS, 43:37CrossRefADSGoogle Scholar
  7. Holwerda, B. W. 2005, PhD thesis, University of Groningen, The NetherlandsGoogle Scholar
  8. Holwerda, B. W., Gonzalez, R. A., Allen, R. J., and van der Kruit, P. C. 2005a, AJ, 129, 1381CrossRefADSGoogle Scholar
  9. Holwerda, B. W., Gonzalez, R. A., Allen, R. J., and van der Kruit, P. C. 2005b, AJ, 129, 1396CrossRefADSGoogle Scholar
  10. Holwerda, B. W., Gonzalez, R. A., Allen, R. J., and van der Kruit, P. C. 2005c, A&A submittedGoogle Scholar
  11. Holwerda, B. W., Gonzalez, R. A., Allen, R. J., and van der Kruit, P. C. 2005d, A&A acceptedGoogle Scholar
  12. Holwerda, B.W., Gonzalez, R. A., Allen, R. J., and van der Kruit, P. C. 2005e, A&A submitted.Google Scholar
  13. Keel, W. C. and White, R. E. 2001, AJ, 121:1442CrossRefADSGoogle Scholar
  14. Kennicutt, R. C. 2006, these proceedings, p. 397Google Scholar
  15. Masters, K. L., Giovanelli, R., and Haynes, M. P. 2003, AJ, 126, 158CrossRefADSGoogle Scholar
  16. Nelson, A. E., Zaritsky, D., and Cutri, R. M. (1998). AJ, 115, 2273CrossRefADSGoogle Scholar
  17. Regan, M. W. et al. 2006, these proceedings, p. 341Google Scholar
  18. Tully, R. B. et al. 1998, AJ, 115, 2264CrossRefADSGoogle Scholar
  19. White, R. E., Keel, W. C., and Conselice, C. J. 2000, ApJ, 542, 761CrossRefADSGoogle Scholar
  20. Zaritsky, D., Christlein, D. 2006, these proceedings, p. 265Google Scholar

Copyright information

© Springer 2007

Authors and Affiliations

  • Benne W. Holwerda
    • 1
    • 2
  • R.A. González
    • 3
  • Ronald J. Allen
    • 2
  • P.C. van der Kruit
    • 1
  1. 1.Kapteyn Astronomical InstituteUniversity of GroningenThe Netherlands
  2. 2.Space Telescope Science InstituteBaltimoreUSA
  3. 3.Centro de Radiastronomía y AstrofísicaMichoacánMexico

Personalised recommendations