منابع مشابه
Chemical Abundances over Cosmic Time
It has recently become possible to measure directly the abundances of several chemical elements in a variety of environments at redshifts up to z 4. In this review I summarise the latest observations of Lyman break galaxies, the Lyman alpha forest and damped Lyman alpha systems with a view to uncovering any clues which these data may offer to the first episodes of star formation. The picture wh...
متن کاملChemical Evolution of Cno Abundances
New low and intermediate mass star yields recalculated by Buell (1987) are evaluated by using them in a Galactic Chemical Evolution model. We analyze their effects on CNO elemental abundances
متن کاملChemical Abundances in Clusters of
We study the origin of iron and-elements (O, Mg, Si) in clusters of galaxies. In particular, we discuss the O/Fe] ratio and the iron mass-to-luminosity ratio in the intracluster medium (ICM) and their link to the chemical and dynamical evolution of elliptical and lenticular galaxies. We adopt a detailed model of galactic evolution incorporating the development of supernovae-driven galactic wind...
متن کاملRelationships among lodranites and acapulcoites: Noble gas isotopic abundances, chemical composition, cosmic-ray exposure ages, and solar cosmic ray effects
Noble gas isotopic abundances of ten lodranites (EET84302, FRO90011, Gibson, LEW86220, LEW88280, Lodran, MAC88177, QUE93148, Y74357, Y791491) and four acapulcoites (Acapulco, ALH81187, ALH81261, ALH84190), as well as major, minor, and trace element compositions of six lodranites (EET84302, Gibson, LEW88280, Lodran, MAC88177, Y791491), are reported. Because existing empirical production rate mod...
متن کاملOrigin of Cosmic Rays
NASA's Chandra X-ray Observatory has discovered the first direct evidence for a superfluid, a bizarre, friction-free state of matter, at the core of a neutron star. Superfluids created in laboratories on Earth exhibit remarkable properties, such as the ability to climb upward and escape airtight containers. The finding has important implications for understanding nuclear interactions in matter ...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2015
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/stv1714