Paper published in a book (Scientific congresses and symposiums)
Constraining Dark Matter with the Long-Term Variability of Quasars
Zackrisson, Erik; Bergvall, Nils; Helbig, Phillip
2002 • In Gilfanov, Marat; Sunyeav, Rashid; Churazov, Eugene (Eds.) Lighthouses of the Universe: The Most Luminous Celestial Objects and Their Use for Cosmology
microlensing; dark matter; cosmological parameters
Abstract :
[en] By comparing the results of numerical microlensing simulations to the observed longterm variability of quasars, strong upper limits on the cosmological density of compact objects in the mass range 10^{-2}-10^{-4} M_⊙ may be imposed. Using recently developed methods to better approximate the amplification of large sources, we investigate in what way the constraints are affected by assumptions concerning the size of the optical continuum-emitting region of quasars in the currently favored ( Ω_{rm M} = 0.3, Ω_Λ = 0.7) cosmology.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Zackrisson, Erik; Department of Astronomy and Space Physics, Box 515, SE-75120 Uppsala, Sweden
Bergvall, Nils; Department of Astronomy and Space Physics, Box 515, SE-75120 Uppsala, Sweden