How cold is cold dark matter? Small scales constraints from the flux power spectrum of the high-redshift Lyman-alpha forest

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  • 2 September 2007
Abstract
We present new constraints on the mass of warm dark matter (WDM) particles derived from the lya flux power spectrum of 55 high- resolution lya forest spectra at 2.0 < z < 6.4 obtained with the HIRES spectrograph at the Keck telescope. From the HIRES spectra alone, we obtain a lower limit of mwdm > 1.2 keV (2 sigma) if the WDM consists of early decoupled thermal relics and mwdm > 5.6 keV (2 sigma) for sterile neutrinos. This result improves the previous constraints from high-resolution spectra at lower redshift by a factor two. Adding the Sloan Digital Sky Survey lya flux power spectrum at 2.2 28 keV (2 sigma) for thermal relics and sterile neutrinos, respectively. This is also a factor two improvement compared to previous combined analysis of high and low-resolution data. The small scale matter power spectrum probed by the high-resolution high-redshift HIRES data is instrumental for this improvement.

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