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The Evolution of the Intergalactic Medium Transmission to Redshift Six | | Antoinette Songaila
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13 Feb 2004 | | Journal: | Astron.J. 127 (2004) 2598 | | Subject: | astro-ph | | Affiliation: | Institute for Astronomy, University of Hawaii | | Abstract: | We have measured the transmission of the Lyman alpha forest produced by neutral hydrogen scattering in the intergalactic medium between redshifts 2 and 6.3 using high signal to noise, high resolution (R > 5000) observations of 50 quasars spread over the redshift range. We use a uniform set of 15 Angstrom intervals covering Lyman alpha, Lyman beta, and Lyman gamma absorption regions to tabulate the forest transmission as a function of redshift. The transmitted fractions show a relatively smooth evolution over the entire range of redshifts, which can be modelled with a smoothly decreasing ionization rate. Previous claims of an abrupt change at a redshift of approximately 6 appear in part to be a consequence of an incorrect conversion of Lyman beta to Lyman alpha optical depths. The tabulated transmissions can be used to calculate the colors of objects with a specified input spectrum as a function of redshift. We calculate the colors of a flat f_nu galaxy with a large intrinsic continuum break, as an important example. | | Source: | arXiv, astro-ph/0402347 | | Services: | Forum | Review | PDF | Favorites | |
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