2009ApJ...703L..14S -
Astrophys. J., 703, L14-L17 (2009/September-3)
Probing the warm dark matter with the high-z quasar luminosity function.
SONG H. and LEE J.
Abstract (from CDS):
In a warm dark matter (WDM) cosmology, the first objects to form at z ≥ 20 are one-dimensional filaments with mean length on the order of the WDM free-streaming scale. Gao & Theuns recently claimed by using high-resolution hydrodynamic simulations that the eventual collapse of these WDM filaments along their longest axes may seed the supermassive black holes that power high-z quasars. In this picture, it is supposed that the high-z quasar luminosity function should reflect how abundant the WDM filaments are in the early universe. We derive analytically the mass function of early-universe filaments with the help of the Zel'dovich approximation. Then, we determine the rate of its decrease in the mass section corresponding to the free-streaming scale of a WDM particle of mass mν. Adjusting the value of mν, we fit the slope of the analytic model to that of the high-z quasar luminosity function measured from the Sloan Digital Sky Survey DR3. A new WDM constraint from this feasibility study is found to be consistent with the lightest super-symmetric partner.
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Journal keyword(s):
cosmology: theory - large-scale structure of universe
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