Jeans smoothing of the Ly$\alpha$ forest absorption lines

Abstract

We investigate a contribution of the Jeans smoothing to the minimal width of Ly$\alpha$ forest lines and discuss how the accounting for this additional broadening affects the inferred parameters of the intergalactic matter equation of state. We estimate a power-law index $\gamma$ of the equation of state, a temperature at the mean density $T_0$ and a hydrogen photoionization rate $\Gamma$ within 4 redshift bins. Furthermore, in each bin we obtain an upper limit on the scale-parameter $f_{\mathrm{J}}$, which sets the relation between the Jeans length and the characteristic physical size of the absorber clouds.

6 pages, 4 figures, 1 table; to appear in proceedings of the International Conference PhysicA.Spb/2019, St. Petersburg, October 22-24, 2019

References in corpus (6)

• Evolution of the Intergalactic Opacity: Implications for the Ionizing Background, Cosmic Star Formation, and Quasar Activity
• A Direct Precision Measurement of the Intergalactic Lyman-alpha Opacity at 2<z<4.2
• The Second Data Release of the KODIAQ Survey
• The Evolution of Lyman alpha Absorbers in the Redshift Range 0.5<z<1.9
• A new Measurement of the Intergalactic Temperature at $z\sim 2.55-2.95$
• The broadening of Lyman-alpha forest absorption lines

Cited by in corpus (1)

• Thermal state of the intergalactic medium at $z\sim 2-4$