Spectral Analysis of the Lyα Forest in a Cold Dark Matter Cosmology
作者： Michael L. Norman , Yu Zhang , Avery Meiksin , Peter Anninos
DOI: 10.1086/304446
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摘要: We simulate the Lyα forest in a standard cold dark matter universe using two-level hierarchical grid code to evolve and baryonic components self-consistently. solve time-dependent ionization equations for hydrogen helium, adopting Haardt & Madau's recent estimate metagalactic UV radiation background. compare our simulation results with measured properties of by constructing synthetic spectra analyzing them an automated procedure identify, deblend, fit Voigt line profiles absorption features. The H I column density Doppler parameter distributions that we obtain agree closely those Keck Observatory's High Resolution Eschelle Spectrograph (HIRES) earlier high spectral resolution observations over range 1012 cm-2 3.5). also values intergalactic He II opacity. Our require ionizing background lower than Madau factor 4, corresponding soft intrinsic QSO spectrum, αQ ≈ 1.8-2.
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sci-hub.st 参考文章(72)
Jordi Miralda-Escudé, Renyue Cen, Jeremiah P. Ostriker, Michael Rauch, The Lyα Forest from Gravitational Collapse in the Cold Dark Matter + Λ Model The Astrophysical Journal. ,vol. 471, pp. 582- 616 ,(1996) , 10.1086/177992
Limin Lu, Wallace L. W. Sargent, Donna S. Womble, Masahide Takada‐Hidai, The Lyα Forest atz∼ 4: Keck HIRES Observations of Q0000−26 The Astrophysical Journal. ,vol. 472, pp. 509- 531 ,(1996) , 10.1086/526756
V. P. Kulkarni, K. Huang, R. F. Green, J. Bechtold, D. E. Welty, D. G. York, Pruning the Lyman α forest of Q1331 + 170 Monthly Notices of the Royal Astronomical Society. ,vol. 279, pp. 197- 218 ,(1996) , 10.1093/MNRAS/279.1.197
John N. Bahcall, Jacqueline Bergeron, Alec Boksenberg, George F. Hartig, Buell T. Jannuzi, Sofia Kirhakos, W. L. W. Sargent, Blair D. Savage, Donald P. Schneider, David A. Turnshek, Ray J. Weymann, Arthur M. Wolfe, The Hubble Space Telescope Quasar Absorption Line Key Project. VII. Absorption Systems at Z abs <= 1.3 The Astrophysical Journal. ,vol. 457, pp. 19- ,(1996) , 10.1086/176709
Li-Zhi Fang, Hongguang Bi, Jian Ge, A Simulation of Ly-alpha Absorption Forests in Linear Approximation in Cold and Cold+Hot Dark Matter Models arXiv: Astrophysics. ,(1995) , 10.1086/176282
E. Giallongo, S. Cristiani, S. D'Odorico, A. Fontana, S. Savaglio, The Proximity Effect, the UV Background, and the Statistics of the LY alpha Lines at High Resolution The Astrophysical Journal. ,vol. 466, pp. 46- ,(1996) , 10.1086/177492
Michael Rauch, Martin G. Haehnelt, Matthias Steinmetz, QSO Metal Absorption Systems at High Redshift and the Signature of Hierarchical Galaxy Formation The Astrophysical Journal. ,vol. 481, pp. 601- 624 ,(1997) , 10.1086/304085
John N. Bahcall, E. E. Salpeter, On the interaction of radiation from distant sources with the intervening medium. The Astrophysical Journal. ,vol. 142, pp. 1677- 1680 ,(1965) , 10.1086/148460
Esther M. Hu, Tae-Sun Kim, Lennox L. Cowie, Antoinette Songaila, Michael Rauch, The Distribution of column densities and b values in the Lyman-alpha forest The Astronomical Journal. ,vol. 110, pp. 1526- 1543 ,(1995) , 10.1086/117625
Arthur F. Davidsen, Gerard A. Kriss, Wei Zheng, Measurement of the opacity of ionized helium in the intergalactic medium Nature. ,vol. 380, pp. 47- 49 ,(1996) , 10.1038/380047A0