The Evolution of the Effective Equation of State of the IGM

Details The Evolution of the Effective Equation of State of the IGM The Evolution of the Effective Equation of State of the IGM

1999-06-25

arxiv.org/abs/astro-ph/9906413v3

Astrophys.J.534:41-56,2000

Astronomy and Astrophysics

Astrophysics

Revised version accepted for publication in ApJ. Vol. 534 May 1, 2000 (in press); 32 pages, 13 figures, 7 tables

Scientific paper

10.1086/308733

We develop a method to extract the "effective equation of state" of the intergalactic medium from the doppler b parameter distribution of the low-density Lyman-alpha forest. We test the method on numerical simulations and then apply it to published observations of the Lyman-alpha forest at redshifts z from 0 to 4. We find that the effective equation of state is close to isothermal at redshift z=3, indicating that a second reheating of the IGM took place at z=3. This reheating can plausibly be identified with the reionization of HeII observed to occur at z about 3.

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