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The broadening of Lyman-alpha forest absorption lines
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We provide an analytical description of the line broadening of HI absorbers in the Lyman-alpha forest resulting from Doppler broadening and Jeans smoothing. We demonstrate that our relation captures the dependence of the line-width on column density for narrow lines in z~3 mock spectra remarkably well. Broad lines at a given column density arise when the underlying density structure is more complex, and such clustering is not captured by our model. Our understanding of the line broadening opens the way to a new method to characterise the thermal state of the intergalactic medium and to determine the sizes of the absorbing structures.
Forward citations
Cited by 3 Pith papers
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Forest without Trees is still Fruitful: Constraints on the thermal state of the neutral IGM at $z\approx5.6$ with the 21-cm forest power spectrum
A null detection of the 21-cm forest toward quasar J352–15 at z≈5.8 disfavors very cold and substantially neutral intergalactic gas, giving the first observational constraints from a 21-cm forest power spectrum.
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A Measurement of the Thermal and Ionization State of the IGM at $z < 0.5$
Low-redshift IGM measured to be extremely hot (T0 ≈ 28,000 K) and nearly isothermal at z=0.1, with Gamma_HI lower than UV-background models, possibly due to 15 km/s turbulence.
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3D matter power spectrum correspondence to 1D Lyman-alpha flux power spectrum
A phenomenological recipe maps 3D matter power to 1D Lyman-alpha flux power, adds warm dark matter and pressure cutoffs in quadrature, and matches simulations to within 5-20%.
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