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2006•Astronomy and AstrophysicsOpen access

The HeII Lyman alpha forest and the thermal state of the IGM

C. Fechner, D. Reimers

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Abstract

Aims.Recent analyses of the intergalactic UV background by means of the Lyα forest assume that and absorption features have the same line widths. We omit this assumption to investigate possible effects of thermal line broadening on the inferred / ratio η and to explore the potential of intergalactic observations to constrain the thermal state of the intergalactic medium.

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Aims.Recent analyses of the intergalactic UV background by means of the Lyα forest assume that and absorption features have the same line widths. We omit this assumption to investigate possible effects of thermal line broadening on the inferred / ratio η and to explore the potential of intergalactic observations to constrain the thermal state of the intergalactic medium.

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Available abstract

Aims.Recent analyses of the intergalactic UV background by means of the Lyα forest assume that and absorption features have the same line widths. We omit this assumption to investigate possible effects of thermal line broadening on the inferred / ratio η and to explore the potential of intergalactic observations to constrain the thermal state of the intergalactic medium.

Key concepts: Intergalactic medium, Lyman-alpha forest, Intergalactic travel, Astrophysics, Line (geometry), Physics, Thermal, Absorption (acoustics)

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