Dust and Gas in the Outer Parts of Galaxies

  • J. Lequeux
  • M. Guélin
Conference paper
Part of the Astrophysics and Space Science Library book series (ASSL, volume 209)

Abstract

We review the observations of dust in the outer disks and the halos of spiral and irregular galaxies. These observations not only yield the abundance of dust and indirectly of heavy elements, but also give indirect information on molecular hydrogen which has been proposed as a constituent of dark matter in galactic disks. Dust can be detected either through its thermal emission or through the reddening and extinction it produces on the light of background objects. Detection of the thermal emission of dust at millimeter wavelengths using bolometers on large telescopes is making considerable progress and we are close to the point where dust will be seen in this way out to the 25-26th mag. arcsec2 blue isophote of the disk. Dust has now been detected in these outer regions of the disks from a statistics of the colors of disks as a function of their inclination, and by direct measurements of the reddening of background galaxies. New results concerning M 31 are presented. There is a surprisingly high dust/gas ratio, and also massive star formation, at these very large galactic radii. The evidence for dust in galactic halos is uncertain.

Keywords

Outer Part Thermal Emission Column Density Dust Emission Spiral 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.

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References

  1. Andreakis Y.C., van der Kruit P.C. 1992, A&A 265, 396ADSGoogle Scholar
  2. Bouchet P., Lequeux J., Maurice E., Prévot L., Prévot-Burnichon M.-L. 1985, A&A 149, 330ADSGoogle Scholar
  3. Davidge T.J. 1993, ApJ 409, 190CrossRefADSGoogle Scholar
  4. de Paolis F., Ingrosso G., Jetzer Ph., Roncadelli M. 1995, A&A 295, 567ADSGoogle Scholar
  5. de Geus E.J., Vogel S.N., Digel S.W., Gruendl R.A. 1993, ApJ 413, L97CrossRefADSGoogle Scholar
  6. Digel S., de Geus E.J, Thaddeus P. 1994, ApJ 422, 92CrossRefADSGoogle Scholar
  7. Digel S.W., Grenier I., Heithausen A., Hunter S.D., Thaddeus P. 1996, ApJ in pressGoogle Scholar
  8. Draine B.T., Lee H.M. 1984, ApJ 441, 270Google Scholar
  9. Falgarone E., Pineau des Forets G., Roueff E. 1995, A&A 300, 870ADSGoogle Scholar
  10. Foltz C.B., Chaffee F.H., Black J.H. 1988, ApJ 324, 267CrossRefADSGoogle Scholar
  11. Giovanelli R., Haynes M.P., Salzer J.J., Wegner G., Da Costa L.N., Freudling W. 1994, AJ 107, 2036CrossRefADSGoogle Scholar
  12. Hodge P., Lee M.G., Mateo M. 1988, ApJ 324, 172CrossRefADSGoogle Scholar
  13. Innanen K.A., Kamper K.W., Papp K.A., van den Bergh S. 1982, ApJ 254, 515CrossRefADSGoogle Scholar
  14. Jacoby G.H, Ford H.C. 1986, ApJ 304, 490CrossRefADSGoogle Scholar
  15. Kaufer A., Szeifert Th., Krenzin R., Baschek B., Wolf B. 1994, A&A 289, 740ADSGoogle Scholar
  16. Lanzetta K.M., Bowen D.V., Tytler D., Webb J.K. 1995, ApJ 442, 538CrossRefADSGoogle Scholar
  17. Lequeux J. 1994 A&A 287, 370ADSGoogle Scholar
  18. Lequeux J., Allen R.J., Guilloteau S. 1993, A&A 280, L23ADSGoogle Scholar
  19. Lequeux J., Dantel-Fort M., Fort B. 1995, A&A 296, L13ADSGoogle Scholar
  20. Lucas R., Liszt H. 1996, A&A in pressGoogle Scholar
  21. Neininger N., Guélin M., Garcia-Burillo S., Zylka R., Wielebinski R. 1996, A&A in pressGoogle Scholar
  22. Newton K., Emerson D.T. 1977, MNRAS 181, 573ADSGoogle Scholar
  23. Pei Y.C., Fall S.M., Bechtold J. 1991, ApJ 378, 6CrossRefADSGoogle Scholar
  24. Peletier R.F., Valentijn E.A., Moorwood A.F.M., Freudling W., Knapen J.H., Beckman J.E. 1995 A&A 300, L1ADSGoogle Scholar
  25. Pettini M., Smith L.J., Hunstead R.W., King D.L. 1994, ApJ 426, 79CrossRefADSGoogle Scholar
  26. Pfenniger D., Combes F., Martinet L. 1994, A&A 285, 79ADSGoogle Scholar
  27. Richer H.B., Crabtree D.R., Pritchet C.J. 1990, ApJ 355, 448CrossRefADSGoogle Scholar
  28. Salati P., Chardonnet P., Xiaochun Luo, Silk J., Taillet R., 1996, preprintGoogle Scholar
  29. Valentijn E.A. 1994, MNRAS 266, 614ADSGoogle Scholar
  30. van der Kruit P.C., Searle L. 1981, A&A 95, 105ADSGoogle Scholar
  31. van der Kruit P.C., Searle L. 1982, A&A 110, 79ADSGoogle Scholar
  32. Walterbos R.A.M., Kennicutt R.C. Jr. 1988, A&A 198, 61ADSGoogle Scholar
  33. Zaritsky D. 1994, AJ 108, 1619CrossRefADSGoogle Scholar

Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • J. Lequeux
    • 1
  • M. Guélin
    • 2
  1. 1.DEMIRM, Observatoire de ParisParisFrance
  2. 2.IRAMDomaine UniversitaireSt Martin d’Hères CEDEXFrance

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