Evolution of the EUV Background from Quasar Absorption Line Studies

  • Jill Bechtold
Chapter
Part of the International Astronomical Union/Union Astronomique Internationale book series (IAUS, volume 168)

Abstract

The integrated extreme ultraviolet. (EUV) radiation from quasars and other high redshift sources provides an ambient ionizing radiation field which may photoionize the gas seen as quasar absorption lines. In particular, the observed evolution of the Lyα forest clouds probably results in part from the evolution of the EUV metagalactic field. Estimates of the EUV field as a function of redshift can be made from measuring the “proximity effect” in quasar spectra; uncertainties in these estimates may be large. Given the uncertainties, the estimated EUV field at z≈3 derived from the proximity effect is in reasonable agreement with the expected contribution from luminous quasars.

Keywords

Proximity Effect High Redshift Extragalactic Background High Velocity Cloud High Redshift Quasar 
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.
This is a preview of subscription content, log in to check access.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Bahcall, J.N. et. al(1993), ApJS, 87, 1ADSCrossRefGoogle Scholar
  2. Bajtlik, S., Duncan, R. C. and Ostriker, J. R (1988), ApJ, 327, 570ADSCrossRefGoogle Scholar
  3. Bechtold, J. (1993), in the Third Teton School on the Evolution of Galaxies and Their Environment, ed. J. M. Shull and H. A. Thronson, (Dordrecht:Kluwer), p. 559Google Scholar
  4. Bechtold,J. (1994), ApJS, 91, 1ADSCrossRefGoogle Scholar
  5. Bechtold, J. (1995), in proceedings of ESO Workshop on QSO Absorption Lines, Garching, ed. G. Meylan, in preparationGoogle Scholar
  6. Bechtold, J., Weymann, R. J., Lin, A. and Malkan, M. (1987), ApJ, 315, 180ADSCrossRefGoogle Scholar
  7. Bechtold, J., Kuhn, O. and Rieke, M. (1995), in preparationGoogle Scholar
  8. Bechtold, J., Dobrzycki, A., Scott, J., Foltz, C. and Lesser, M. (1995), in preparationGoogle Scholar
  9. Bochkarev, N. G. and Sunyaev, R. A. (1977), Astron.Zh, 54, 957; translated in Soviet. Astronomy, 21, 542ADSGoogle Scholar
  10. Bowyer, S. (1991), ARAA, 29, 59ADSCrossRefGoogle Scholar
  11. Car swell, R. F., Webb, J. K., Baldwin, J. A. and Atwood, B. (1987), ApJ, 319, 709ADSCrossRefGoogle Scholar
  12. Charlton, J. C., SalPeter, E. E., and Hogan, C. J. (1993), ApJ, 402, 493ADSCrossRefGoogle Scholar
  13. Code, A. D. and Welch, G. A. (1982), 256, 1Google Scholar
  14. Corbelli, E. and Schneider, S. E. (1990), ApJ, 356, 14ADSCrossRefGoogle Scholar
  15. Cowsik, R. (1977), Phys. Rev. Lett, 39, 784ADSCrossRefGoogle Scholar
  16. De Rejula, A. and Glashow, S. (1980), Phys. Rev. Lett, 45, 942ADSCrossRefGoogle Scholar
  17. Donahue, M., Aldering, G., and Stocke, J. (1994), paper 60.05 presented at May 1994Google Scholar
  18. AAS meeting, MinneapolisGoogle Scholar
  19. Dove, J. B. and Shull, J. M. (1994), ApJ, 423, 196ADSCrossRefGoogle Scholar
  20. Espey, B. R. (1993), ApJ, 411, L59ADSCrossRefGoogle Scholar
  21. Fall, S. M. and Pei, Y. C. (1993), ApJ, 402, 479ADSCrossRefGoogle Scholar
  22. Giovanelli, R. and Haynes, M. P. (1989), ApJ, 346, L5ADSCrossRefGoogle Scholar
  23. Henry, R. C. (1991), ARAA, 29, 89ADSCrossRefGoogle Scholar
  24. Ikeuchi, S. and Turner, E. L. (1991), ApJ, 381, LlGoogle Scholar
  25. Kimble, R., Bowyer, S. and Jakobsen, P. (1981), Phys. Rev. Lett, 46, 80ADSCrossRefGoogle Scholar
  26. Kuhr, H., McAlary, C. W., Rudy, R. J., Strittmatter, P. A. and Rieke, G. H. (1984), ApJ, 275 L33ADSCrossRefGoogle Scholar
  27. Kulkarni, V. P. and Fall, S. M. (1993), ApJ, 413, L63ADSCrossRefGoogle Scholar
  28. Madau, P. (1992), ApJ, 389, L1ADSCrossRefGoogle Scholar
  29. Madau, P. (1995), in proceedings of the ESO Workshop on QSO Absorption Lines, Garching, ed. G. Meylan, in preparationGoogle Scholar
  30. Maloney, P. (1992), ApJ, 398, L89ADSCrossRefGoogle Scholar
  31. Martin, C., Hurwitz, M. and Bowyer, S. (1991), ApJ, 379, 549ADSCrossRefGoogle Scholar
  32. Melott, A. L., and Sciama, D. W. (1981), Phys. Rev. Lett, 46, 1369ADSCrossRefGoogle Scholar
  33. Miralde-Escude, J. and Ostriker, J. P. (1990), ApJ, 350, 1ADSCrossRefGoogle Scholar
  34. Miralde-Escude, J. and Ostriker, J. P. (1992), ApJ, 392, 15ADSCrossRefGoogle Scholar
  35. Murdoch, H. S., Hunstead, R. W., Pettini, M. and Blades, J. C. (1986), ApJ, 309, 19ADSCrossRefGoogle Scholar
  36. Ostriker, J. P. and Heisler, J. (1984), ApJ, 278, 1ADSCrossRefGoogle Scholar
  37. Paresce, F. (1990), in The Galactic and Extragalactic Background Radiation, ed. S Bowyer, and C. Leinert, p. 307Google Scholar
  38. Rees, M. J. and Setti, G. (1979), A & A, 8, 410ADSGoogle Scholar
  39. Reimers, D. (1995), in proceedings of the ESO Workshop on QSO Absorption Lines, Garching, ed. G. Meylan, in preparationGoogle Scholar
  40. Reynolds, R. J. (1987), ApJ, 323, 553ADSCrossRefGoogle Scholar
  41. Reynolds, R. J., Magee, K., Roesler, F. L., Scherb, F. and Harlander, J. (1986), ApJ, 309, L9ADSCrossRefGoogle Scholar
  42. Sargent, W. L. W., Young, P. J., Boksenberge, A. and Tytler, D. (1980), ApJS, 42, 41ADSCrossRefGoogle Scholar
  43. Savage, B. (1995), in proceedings of the ESO Workshop on QSO Absorption Lines, Garching, ed. G. Meylan, in preparationGoogle Scholar
  44. Sciama, D. (1995), in proceedings of the ESO Workshop on QSO Absorption Lines, Garching, ed., G. Meylan, in preparationGoogle Scholar
  45. Silk, J. and Sunyaev, R. A. (1976), Nature, 260, 508ADSCrossRefGoogle Scholar
  46. Songaila, A., Bryant, W. and Cowie, L. L. (1989), ApJ, 345, L71ADSCrossRefGoogle Scholar
  47. Stocke, J. T., Case, J., Donahue, M., Shull, J. M. and Snow, T. P. (1991), ApJ, 374, 72ADSCrossRefGoogle Scholar
  48. Terasawa, N. (1992), ApJ, 392, L15. Tinsley, B. M. (1972), ApJ, 178, 319Google Scholar
  49. van Gorkom, J. H. (1993), in The Third Teton Conference on The Environment and Evolution of Galaxies, ed. J. M. Shull and H. A. Thronson ( Dordrecht: Kluwer ), p. 343Google Scholar
  50. van Gorkom, J. H., Cornwell, T., van Albada, T. S. and Sancisi, R. (1994), in preparationGoogle Scholar
  51. Vogel, S. N., Weymann, R., Rauch, M. and Hamilton, T. (1994), preprintGoogle Scholar
  52. Weymann, R. J., Carswell, R. F. and Smith, M. G. (1981), ARAA, 19, 41ADSCrossRefGoogle Scholar
  53. Williger, G. M., Baldwin, J. A., Carswell, R. F., Cooke, A. J., Hazard, C., Irwin, M. J., McMahon, R. G., Storrie-Lombardi, L. J. (1994), ApJ, 428, 574ADSCrossRefGoogle Scholar
  54. Wright, E. L. (1986), ApJ, 311, 156ADSCrossRefGoogle Scholar

Copyright information

© IAU 1996

Authors and Affiliations

  • Jill Bechtold
    • 1
  1. 1.Steward ObservatoryUniversity of ArizonaTucsonUSA

Personalised recommendations