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نویسندگان
چکیده
منابع مشابه
The Chemical Uniformity of High Z Dla Protogalaxies
We investigate chemical abundance variations along the sightlines through 13 damped Lyα systems (DLA). We introduce a technique designed to identify abundance variations in multiple velocity bins along the sightlines and perform a series of Monte-Carlo simulations to derive quantitative limits and values. The majority of these DLA have very uniform relative abundances: 95% c.l. upper limits of ...
متن کاملSpeed analyse of two step algorithms of trigonometric transformations on multi-core processors
The two-stage trigonometric transformations algorithms have full symmetry calculations for each stage of the algorithm. Such algorithm may be subjected to any decomposition allowing to split the process of the calculations into any number of processes, which can be implemented independently within one step of the algorithm. Additionally, a single step of algorithm may depend on the size of the ...
متن کاملSimulating extremely metal - poor gas and DLA metal content at redshift z ≃ 7
We present the first theoretical study of metals in damped-Lyα (DLA) systems at redshift z ≃ 7. The features of cold, primordial gas are studied by means of N-body, hydro, chemistry simulations, including atomic and molecular non-equilibrium chemistry, cooling, star formation for population III and population II-I regimes, stellar evolution, cosmic metal spreading according to proper yields (fo...
متن کاملProbing feedback in protogalaxies : multiphase gas in a DLA at z ≈ 2 . 4
We investigate the physical processes occurring in the multiphase gas of a damped Lyα absorber (DLA). We base our analysis on a high-quality Keck High-Resolution Echelle Spectrometer (HIRES) spectrum of the QSO J1211+0422 in which a DLA is detected at z ! 2.377. There is little contamination of the high-ion (O VI, N V, C IV, Si IV) absorption, allowing us to explore the properties of the highly...
متن کاملVelocity - metallicity correlation for high - z DLA galaxies : Evidence for a mass - metallicity relation ? ⋆
We used our database of VLT-UVES quasar spectra to build up a sample of 70 Damped Lyman-α (DLA) or strong sub-DLA systems with total neutral hydrogen column densities of log N(H ) > ∼ 20 and redshifts in the range 1.7 < z abs < 4.3. For each of the systems, we measured in an homogeneous manner the metallicities relative to Solar, [X/H] (with X = Zn, or S or Si), and the velocity widths of low-...
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ژورنال
عنوان ژورنال: Zagadnienia Informacji Naukowej - Studia Informacyjne
سال: 2018
ISSN: 2392-2648,0324-8194
DOI: 10.36702/zin.384