The XMM-Ω project
نویسندگان
چکیده
منابع مشابه
The Xmm–newton Ω Project
The abundance of high–redshift galaxy clusters depends sensitively on the matter density ΩM and, to a lesser extent, on the cosmological constant Λ. Measurements of this abundance therefore constrain these fundamental cosmological parameters, and in a manner independent and complementary to other methods, such as observations of the cosmic microwave background and distance measurements. Cluster...
متن کاملThe XMM – NEWTON Ω Project : I . The X - ray Luminosity – Temperature Relation at z > 0 . 4
We describe XMM-Newton Guaranteed Time observations of a sample of eight high redshift (0.45<z<0.62) clusters. The goal of these observations was to measure the luminosity and the temperature of the clusters to a precision of ∼10%, leading to constraints on the possible evolution of the luminosity–temperature (Lx − Tx) relation, and ultimately on the values of the matter density, ΩM, and, to a ...
متن کاملThe XMM - Ω project : II . Cosmological implications from the high redshift L − T relation of X - ray clusters
The evolution with redshift of the temperature-luminosity relation of X-ray galaxy clusters is a key ingredient to break degeneracies in the interpretation of X-ray clusters redshift number counts. We therefore take advantage of the recent measurements of the temperature-luminosity relation of distant clusters observed with XMM-Newton and Chandra satellites to examine theoretical number counts ...
متن کاملThe XMM – NEWTON Project : I . The X - ray Luminosity – Temperature
We describe XMM-Newton Guaranteed Time observations of a sample of eight high redshift (0.45<z<0.62) clusters. The goal of these observations was to measure the luminosity and the temperature of the clusters to a precision of ∼10%, leading to constraints on the possible evolution of the luminosity–temperature (Lx − Tx) relation, and ultimately on the values of the matter density, ΩM, and, to a ...
متن کامل0 ω − ρ Mixing and the ω → ππγ Decay
We reexamine the ω → π0 π0 γ decay, adding the effect of ω−ρ mixing to the amplitude calculated with the aid of chiral perturbation theory and vector meson dominance. We predict the neutral decay to occur with a width of Γ(ω → π0 π0 γ ) = (390 ± 96)eV and also analyze the effect of the ω − ρ mixing on the Γ(ω → π0 π0 γ )/Γ(ω → π+ π γ ) ratio. Several remarks on the effect of ω − ρ mixing on cer...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2003
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20034603