The Lyα clouds as tracers of the evolution of the universe

  • Jose Luis Sanz
Part I The Universe at High-z
Part of the Lecture Notes in Physics book series (LNP, volume 470)


The Lyα clouds are a useful tool for Cosmology because they sample the history of the universe to high redshift (z≅5). Their physical properties at any time (column densities, velocity dispersions, chemical abundances) and their statistical ones (number density, spatial correlation) give relevant information about the intergalactic medium. On the other hand, the relative lack of clouds near QSOs can be used to constrain the UV-background at high-z. It is now claimed that the origin of the clouds is tightly related to the process of structure formation in the universe and maybe a high proportion are in fact related to galaxies.


Dark Matter Velocity Dispersion Column Density Galaxy Formation Intergalactic Medium 
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. Bahcall, J. N., Bergeron, J., Boksenberg, A. et al. 1993, ApJS, 87, 1.CrossRefADSGoogle Scholar
  2. Bahcall, J. N. et al. 1996, ApJ, 457, 19.CrossRefADSGoogle Scholar
  3. Bajtlik, S., Duncan, R. C. and Ostriker, J. P. 1988, ApJ 327, 570.CrossRefADSGoogle Scholar
  4. Barcons, X., Lanzetta, K. M. and Webb, J. K. 1995, Nature 376, 321.CrossRefADSGoogle Scholar
  5. Beaver et al. 1991, ApJ 377, L1.CrossRefADSGoogle Scholar
  6. Bechtold, J. 1994, ApJS, 91, 1.CrossRefADSGoogle Scholar
  7. Bechtold, J., Weymann, R., Lin, Z. and Malkan, M. A. 1987, ApJ, 315, 180.CrossRefADSGoogle Scholar
  8. Bechtold, J., Crotts, A. P. S., Duncan, R. C. and Fang, Y. 1994, ApJ, 327, 570.Google Scholar
  9. Benitez, N., Martinez-González, E., Sanz, J. L., Aguirre, A. and Alises, M., 1996, submitted to ApJ.Google Scholar
  10. Bergeron, J. and Boissé, P. 1991, A&A, 243, 344.ADSGoogle Scholar
  11. Carswell, R. F. et al. 1995, MNRAS, 278, 506.ADSGoogle Scholar
  12. Carswell, R. F., Lanzetta, K. M., Parnell, H. C. and Webb, J. K. 1991, ApJ, 371, 36.CrossRefADSGoogle Scholar
  13. Carswell, R. F., Rauch, M., Weymann, R. J., Cooke, A. J. and Webb, J. K. 1994, MNRAS, 268, L1.ADSGoogle Scholar
  14. Carswell, R. F., Whelan, J. A. J., Smith, M. G., Boksemberg A. and Tytler, D. 1982, MNRAS, 198, 91.ADSGoogle Scholar
  15. Casertano, S., Ratnatunga, K. U., Griffiths, R. E., Im, M., Neuschaefer, L. W., Ostrander, E. J. and Windhorst, R. A. 1995, ApJ, in press.Google Scholar
  16. Cen, R., Miralda-Escudé, J., Ostriker, J. P. and Rauch, M. 1994, ApJ, 437, L9.CrossRefADSGoogle Scholar
  17. Charlton, J. C., Churchill, C. W. and Linder, S. M. 1995, ApJ, 452, L81.CrossRefADSGoogle Scholar
  18. Chernomordik, V. V. 1995, ApJ, 440, 431.CrossRefADSGoogle Scholar
  19. Cowie, L. L., Songaila, A., Kim, T.-S. and Hu, E. M. 1995, AJ, 109, 1522.CrossRefADSGoogle Scholar
  20. Cristiani, S. 1995, astro-ph/9512086.Google Scholar
  21. Cristiani, S., D'Odorico, S., Fontana, A., Giallongo, E. and Savaglio, S. 1995, MNRAS, 273, 1016.ADSGoogle Scholar
  22. Crotts, A. P. S. 1989, ApJ, 336, 550.CrossRefADSGoogle Scholar
  23. Davidsen, A. et al. 1995, AAS meeting, Pittsburgh, June 1995.Google Scholar
  24. Dickinson, M. 1996, in this volume.Google Scholar
  25. Dinshaw, N., Impey, C. D., Foltz, C. B., Weymann, R. J. and Chaffee, F. H. 1994, ApJ, 437, L87.CrossRefADSGoogle Scholar
  26. Dinshaw, N., Foltz, C. B., Impey, C. D., Weymann, R. J. and Morris, S. L. 1995, Nature, 373, 223.CrossRefADSGoogle Scholar
  27. de la Fuente, A., Rodriguez-Pascual, P. M., Sanz. J. L. and Recondo, M. C. 1995, preprint.Google Scholar
  28. Fang, Y., Duncan, R. C., Crotts, A. P. S. and Bechtold, J., 1995, astro-ph/9510112.Google Scholar
  29. Fernández-Soto, A., Barcons, X., Carballo, R. and Webb, J. K. 1995, MNRAS, 277, 235.ADSGoogle Scholar
  30. Francis et al. 1996, ApJ, 457, 490.CrossRefADSGoogle Scholar
  31. Giallongo, E., Cristiani, S. and Trevese, D. 1992, ApJ, 325, L12.Google Scholar
  32. Giallongo, E., Cristiani, S., Fontana, A. and Trevese, D. 1993, ApJ, 416, 137.CrossRefADSGoogle Scholar
  33. Giallongo et al. 1994, ApJ, 425, L1.CrossRefADSGoogle Scholar
  34. Haardt, F. and Madau, P. 1995, astro-ph/9509093.Google Scholar
  35. Haehnelt, M. G. 1995, astro-ph/9512034.Google Scholar
  36. Hernquist, L., Katz, N., Weinberg, D. H. and Miralda-Escudé, J. 1995, astro-ph/9509105.Google Scholar
  37. Hu, E. M., Kim, T., Cowie, L. L., Songaila, A. and Rauch, M. 1996, AJ, 110, 1526.CrossRefADSGoogle Scholar
  38. Hu, E. M., McMahon, R. G. and Egami, E. 1996, preprint.Google Scholar
  39. Ikeuchi, S. 1986, Astr. Sp. Sci. 118, 509.CrossRefADSGoogle Scholar
  40. Jakobsen, P., Boksenberg, A., Deharveng, J. M. et al. 1994, Nature, 370, 35.CrossRefADSGoogle Scholar
  41. Jenkins, E. B. and Ostriker, J. P. 1991, ApJ, 376, 33.CrossRefADSGoogle Scholar
  42. Kulkarni, V. P. and Fall, M. 1994, ApJ, 413, L63.CrossRefADSGoogle Scholar
  43. Lanzetta, K. M., Bowen, D. V., Tytler, D. and Webb, J. K. 1995, ApJ, 442, 538.CrossRefADSGoogle Scholar
  44. Le Brun, V., Bergeron, J. and Boissé, P. 1995, preprint.Google Scholar
  45. Linsky, J. L., Diplas, A., Wood, B. E., Brown, A., Ayres, T. R. and Savage, B. D. 1995, ApJ, in press.Google Scholar
  46. Lu, L. 1991, ApJ, 379, 99.CrossRefADSGoogle Scholar
  47. Lu, L., Wolfe, A. M., and Turnshek, D. A. 1991, ApJ, 367, 19.CrossRefADSGoogle Scholar
  48. Lynds, C. R. 1971, ApJ, 164, L73.CrossRefADSGoogle Scholar
  49. Lowenthal, J. D., Hogan, C. J., Green, R. F., Caulet, A., Woodgate, B. E., Brown, L. and Foltz, C. B. 1991, ApJ, 377, L73.CrossRefADSGoogle Scholar
  50. Madau, P. 1992, ApJ, 389, L1.CrossRefADSGoogle Scholar
  51. Meiksin, A. and Madau, P. 1993, ApJ, 412, 34.CrossRefADSGoogle Scholar
  52. McGill, C. 1990, MNRAS, 256, 43P.Google Scholar
  53. Morris, S. L., Weymann, R. J., savage, B. L. and Guilliland, R. 1991, ApJ, 377, L21.CrossRefADSGoogle Scholar
  54. Miralda-Escudé, J. and ostriker, J. P. 1990, ApJ, 350, 1.CrossRefADSGoogle Scholar
  55. Mücket, J., Petitjean, P., Kates, R. E. and Riediger, R. 1995, astro-ph/9508129.Google Scholar
  56. Petitjean, P., Mucket, J. and Kates, R. E. 1995, A&A, 295, L9.ADSGoogle Scholar
  57. Pettini, M., Hunstead, R. W., Smith, L. J. and Mar, D. P. 1990, MNRAS, 246, 545.ADSGoogle Scholar
  58. Press, W. H. and Ribicki, G. B. 1993, ApJ, 418, 585.CrossRefADSGoogle Scholar
  59. Rauch, M. 1995, astro-ph/9512002.Google Scholar
  60. Rauch, M. Carswell, R. F., Webb, J. K. and Weymann, R. J. 1993, MNRAS, 260, 589.ADSGoogle Scholar
  61. Rees, M. J. 1986, MNRAS, 218, 25.ADSGoogle Scholar
  62. Reisenegger, A. and Miralda-Escudé, J. 1995, ApJ, 449, 476.CrossRefADSGoogle Scholar
  63. Rodriguez-Pascual, P. M., de la Fuente, A., Sanz, J. L., Recondo, M. C., Clavel, J., Santos-Lleo, M. and Wamsteker, W. 1995, ApJ, 448, 575.CrossRefADSGoogle Scholar
  64. Röser, H. 1995, A&A, 299, 641.Google Scholar
  65. Rugers, M. and Hogan, C. J. 1995, preprint.Google Scholar
  66. Salpeter, E. E. and Hoffman, G. L. 1995, ApJ, 441, 51.CrossRefADSGoogle Scholar
  67. Sanz, J. L., Clavel, J., Naylor, T. and Wamsteker, W. 1993, MNRAS, 260, 589.Google Scholar
  68. Sargent, W. L. W., Young, P., Boksemberg, M. and Tytler, D. 1980, ApJS, 42, 41.CrossRefADSGoogle Scholar
  69. Shaver, P. A. and Robertson, J. G. 1983, ApJ, 268, L57.CrossRefADSGoogle Scholar
  70. Shull, J. M., Stocke, J. T. and Penton, S. 1996, AJ, 111, 72.CrossRefADSGoogle Scholar
  71. Smette, A., Surdej, J., Shaver, P. A. et al. 1992, ApJ, 389, 39.CrossRefADSGoogle Scholar
  72. Smette, A., Robertson, J. G., Shaver, P. A., Reimers, D., Wisotzki, L. and Kohler, Th. 1995, A&AS, 113, 199.ADSGoogle Scholar
  73. Songaila, A., Cowie, L. L., Hogan, C. J. and Rugers, M. 1994, Nature, 368, 599.CrossRefADSGoogle Scholar
  74. Songaila, A., Hu, E. M. and Cowie, L. L. 1995, Nature, 375, 324.CrossRefGoogle Scholar
  75. Steidel, C. C. and Sargent, W. L. W. 1987, ApJ, 318, L11.CrossRefADSGoogle Scholar
  76. Steidel, C. C., Dickinson, M. and Persson, S. E. 1994, ApJ, 437, L75.CrossRefADSGoogle Scholar
  77. Steidel, C. C., Pettini, M., Dickinson, M. and Persson, S. E. 1996a, MIT preprint No. CSR-94-24.Google Scholar
  78. Steidel, C. C., Bowen, D. V., Blades, J. C. and Dickinson, M. 1996b, preprint.Google Scholar
  79. Steidel, C. C., Giavalisco, M., Pettini, M., Dickinson, M. and Adelberger, K. L. 1996, preprint.Google Scholar
  80. Stocke, J. T., Shull, J. M., Penton, S., Donahue, M. and Carilli, C. 1995, ApJ, 451, 24.CrossRefADSGoogle Scholar
  81. Tripp, T. M., Green, R. F. and Bechtold, J. 1990, 364, L29.Google Scholar
  82. Tytler, D. and Fan, X.-M. 1994, ApJ, 321, 49.CrossRefGoogle Scholar
  83. Tytler, D., Fan, X.-M., Burles, S. et al. 1995, in QSO Absorption Lines, Proc. ESO Workshop, Munich 1995; ed. G. Meylan, Springer-Verlag, Heidelberg, Germany.Google Scholar
  84. Vogel, S. N., Weymann, R., Rauch, M. and Hamilton, T. 1995, ApJ, 441, 162.CrossRefADSGoogle Scholar
  85. Webb, J. K. 1987, in IAU Symp. 124, Observational Cosmology, ed. A. Hewitt, G. Burbidge and L. Z. Fang (Dordrecht: Reidel), 803.Google Scholar
  86. Webb, J. K., Barcons, X., Carswell, R. F., and Parnell, H. C. 1992, MNRAS, 255, 319.ADSGoogle Scholar
  87. Williger, G. M. and Babul, A., 1992, ApJ, 399 385.CrossRefADSGoogle Scholar
  88. Williger, G. M. et al. 1994, ApJ, 428, 574.CrossRefADSGoogle Scholar
  89. Wolfe, A. M., Fan, X.-M., Tytler, D., Vogt, S. S., Keane, M. J. and Lanzetta, K. M. 1994, ApJ, 435, L101.CrossRefADSGoogle Scholar
  90. Womble, D. S., Sargent, W. L. W. and Lyons, H. S. 1995, preprint.Google Scholar
  91. Zhang, Y., Anninos, P. and Norman, M. L. 1995, preprint.Google Scholar

Copyright information

© Springer-Verlag 1996

Authors and Affiliations

  • Jose Luis Sanz
    • 1
  1. 1.Instituto de Fisica de Cantabria (CSIC-UC)Universidad de CantabriaSantander

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