Organics and Ices in Galactic Dust

  • Yvonne J. Pendleton
Part of the Astrophysics and Space Science Library book series (ASSL, volume 209)


Hydrocarbon absorption (3.4 μm) along several different sightlines through the galaxy indicates that the dust carrier lies in the diffuse interstellar medium (DISM). Correlations of the hydrocarbon and silicate absorption features suggest an increased abundance of both in the direction of the galactic center. Dense molecular clouds do not exhibit the same type of 3.4 μm feature as seen in the DISM, which is puzzling in light of dust cycling times. Laboratory organics produced by different processes are compared to the DISM features. The 3.4 μm feature has now been detected in other galaxies, which suggests that the widespread distribution of organic material in our own galaxy may be common to other galaxies as well.


Interstellar Medium Molecular Cloud Galactic Center Dense Cloud Interstellar Dust 
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.


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  1. Adamson, A.J., Whittet, D., & Duley, W.W. 1990, M.N.R.A.S., 243, 400ADSGoogle Scholar
  2. Allamandola, L. J., Sandford, S. A., Tielens, A.G.G.M., & Herbst, T. M.1992, ApJ, 399, 139CrossRefADSGoogle Scholar
  3. Allamandola, L. J., Sandford, S. A., & Valero, G. J. 1988,Icarus, 76, 225CrossRefADSGoogle Scholar
  4. Bernstein, M., Sandford, S.,Allamandola, L., & Chang, S. 1995, Ap. J., 454, 327CrossRefADSGoogle Scholar
  5. Brooke, T. Y., Sellgren, K., & Smith, R. G. 1996, Ap. J., march issueGoogle Scholar
  6. Bridger, A., Wright, G. & Geballe, T. 1993 In Infrared Astronomy with Arrays: The Next Generation, (I.S. McLean, ed.) Kluwer Academic Press, p. 537Google Scholar
  7. d’Hendecourt, L. B., Allamandola, L. J. and Greenberg, J. M. 1985, Astr. Ap. 152, 130ADSGoogle Scholar
  8. Duley, W. W. 1994, Ap. J. (Letters), 430, L133CrossRefADSGoogle Scholar
  9. Greenberg, J. M., Li, A.,Mendoza-Gomez, C.X., Schutte, W., Gerakines, P. A. & DéGroot, M. 1995, Ap. J. (Letters), 455, L177CrossRefADSGoogle Scholar
  10. Jones, A. P., Duley, W. W., & Williams, D. A. 1987, M.N.R.A.S., 229, 213ADSGoogle Scholar
  11. Pendleton, Y. 1994, in Infrared Cirrus and Diffuse Dust, R. Cutri and W. Latter, eds., bf 58, 255Google Scholar
  12. Pendleton, Y, Sandford, S., Allamandola, L. J,Tielens, A. G. G. M. & Sellgren, K. 1994, Ap. J., 437, 683CrossRefADSGoogle Scholar
  13. Pendleton, Y, Tielens, A.G.G.M, & Tokunaga, A. 1996, in preparationGoogle Scholar
  14. Roche P.F., & Aitken, D.K 1985, M.N.R.A.S., 215, 425ADSGoogle Scholar
  15. Sandford, S. A., Allamandola, L. J., Tielens, A.G.G.M., Sellgren, K., Tapia, M., & Pendleton, Y. 1991, Ap. J., 331, 607CrossRefADSGoogle Scholar
  16. Strazzulla, G. & Johnson, R. E. 1991, In Comets in the Post-Halley Era, R. L. Newburn, Jr., M. Neugebauer, and J. Rahe (eds.), (Kluwer:Dordrecht) 1, 243CrossRefGoogle Scholar
  17. Tegler, S.C., Weintraub, D. A., Rettig, T. W. Pendleton, Y. J., Whittet, D., & Kulesa, C. A. 1995, Ap. J., 439, 279CrossRefADSGoogle Scholar

Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • Yvonne J. Pendleton
    • 1
  1. 1.NASA Ames Research CenterMoffett FieldUSA

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