Dramatic Traditions of the Dark Ages
نویسندگان
چکیده
منابع مشابه
Violence in the Dark Ages
A wide range of observational and theoretical arguments suggest that the universe experienced a period of heating and metal enrichment, most likely from starbursting dwarf galaxies. Using a hydrodynamic simulation we have conducted a detailed theoretical investigation of this epoch at the end of the cosmological “dark ages”. Outflows strip baryons from pre-viralized halos with total masses ∼ <1...
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In currently popular cosmological scenarios – all variants of the cold dark matter (CDM) cosmogony – some time beyond a redshift of 15, stars within the numerous small halos that condense with virial temperatures ∼ 10 K created the first heavy elements; these protogalactic systems, together perhaps with an early population of mini-quasars, generated the ultraviolet radiation and mechanical ener...
متن کاملParticle decays during the cosmic dark ages
We consider particle decays during the cosmic dark ages with two aims: ~1! to explain the high optical depth reported by the Wilkinson Microwave Anisotropy Probe ~WMAP!, and ~2! to provide new constraints to the parameter space for decaying particles. We delineate the decay channels in which most of the decay energy ionizes and heats the intergalactic medium gas @and thus affects the cosmic mic...
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Galaxies undergoing formation and evolution can now be directly observed over a time baseline of some 12 Gyr. An inherent difficulty with high–redshift observations is that the objects are very faint and the best resolution (HST) is only ∼ 0.5 kpc. Such studies thereby combine in a highly synergistic way with the great detail that can be obtained for nearby galaxies through "archaeological" stu...
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ژورنال
عنوان ژورنال: The Classical Weekly
سال: 1908
ISSN: 1940-641X
DOI: 10.2307/4385755