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Constraining Dark Matter with the Long-Term Variability of Quasars
Zackrisson, Erik; Bergvall, Nils; Helbig, Phillip
2002In Gilfanov, Marat; Sunyeav, Rashid; Churazov, Eugene (Eds.) Lighthouses of the Universe: The Most Luminous Celestial Objects and Their Use for Cosmology
 

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Keywords :
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
Helbig, Phillip  ;  Université de Liège - ULiège > Form. doct. sc. (sc. spatiales - paysage)
Language :
English
Title :
Constraining Dark Matter with the Long-Term Variability of Quasars
Publication date :
2002
Event name :
Lighthouses of the Universe: The Most Luminous Celestial Objects and Their Use for Cosmology
Event date :
Germany, 6-10 August 2001
Main work title :
Lighthouses of the Universe: The Most Luminous Celestial Objects and Their Use for Cosmology
Author, co-author :
Churazov, Eugene
Editor :
Gilfanov, Marat
Sunyeav, Rashid
Publisher :
Springer
ISBN/EAN :
3-540-43769-X
Collection name :
Eso Astrophysics Symposia
Pages :
550
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