SIMBAD references

2004AJ....127.2598S - Astron. J., 127, 2598-2603 (2004/May-0)

The evolution of the intergalactic medium transmission to redshift 6.

SONGAILA A.

Abstract (from CDS):

We have measured the transmission of the Lyα 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 Å intervals covering Lyα, Lyβ, and Lyγ 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 modeled with a smoothly decreasing ionization rate. Previous claims of an abrupt change at z∼6 appear in part to be a consequence of an incorrect conversion of Lyβ to Lyα 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-fνgalaxy with a large intrinsic continuum break as an important example.

Abstract Copyright:

Journal keyword(s): Cosmology: Early Universe - Galaxies: Formation - Galaxies: Intergalactic Medium - Galaxies: Quasars: Absorption Lines

CDS comments: Tables 1 and 2 : some identifications are for B1950, other for J2000.

Simbad objects: 51

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