Results 11 to 20 of about 14,115,145 (304)
Acta Polytechnica, 2013 Pop III stars are the key to the character of primeval galaxies, the first heavy elements, the onset of cosmological reionization, and the seeds of supermassive black holes.
Daniel J. Whalen
doaj +5 more sources
Modelling and observations of molecules in discs around young stars [PDF]
, 2013 This thesis contains a study of molecules within circumstellar discs around young stars. Firstly, the chemistry of a disc around a young, Class 0 protostar is modelled.
Ilee, John David
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Astronomy & Astrophysics, 2013 Detailed abundances of the elements produced by r-process nucleosynthesis in various circumstances are our best observational clues to their origin, since the site(s) of r-element production is(are) still not known with certainty. A small fraction of extremely metal-poor (EMP) stars exhibit excesses of heavy neutron-capture elements produced in the r ...
Siquerira Mello Jr., C. +16 more
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Proceedings of the International Astronomical Union, 2007 AbstractThe formation of the first generations of stars at redshifts z ≥ 15 − 20 signaled the transition from the simple initial state of the universe to one of ever increasing complexity. We here review recent progress in understanding the assembly process of the first galaxies, starting with cosmological initial conditions and modelling the detailed ...
Johnson, Jarrett L. +2 more
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Gravitoastronomy with neutron stars [PDF]
, 2004 Recent advances in gravitational wave detectors mean that we can start to make astrophysically important statements about the physics of neutron stars based on observed upper limits to their gravitational luminosity.
Woan, G., Graham Woan
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Formation of the first stars [PDF]
Proceedings of 11th Symposium on Nuclei in the Cosmos — PoS(NIC XI), 2005 Review, revised version; now in print, Rep. Prog. Phys. (2013), 52 pages, 14 figures (for high-resolution, please see the journal)
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Formation Of The First Galaxies [PDF]
, 2012 The emergence of the first stars and galaxies ended the cosmic dark ages, thus fundamentally transforming the simple initial state of the universe into one of ever increasing complexity.
Bromm, V., Volker Bromm
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The Astrophysical Journal, 2003 The external pollution of the first stars in the Galaxy is investigated. The first stars were born in clouds composed of the pristine gas without heavy elements. These stars accreted gas polluted with heavy elements while they still remained in the cloud. As a result, it is found that they exhibit a distribution with respect to the surface metallicity.
Shigeyama, Toshikazu +2 more
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Assembly Of The First Disk Galaxies Under Radiative Feedback From Pop III Stars [PDF]
, 2012 We investigate how radiative feedback from the first stars affects the assembly of the first dwarf galaxies. We perform cosmological zoomed smoothed particle hydrodynamics simulations of a galaxy assembling inside a halo reaching a virial mass similar to
Bromm, V. +5 more
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The first stars in the Universe
Monthly Notices of the Royal Astronomical Society: Letters, 2006 Abstract Large telescopes have allowed astronomers to observe galaxies that formed as early as 850 million years after the big bang. We predict when the first star that astronomers can observe (i.e. in our past light cone) formed in the Universe, accounting for the first time for the size of the Universe and for three essential ...
Naoz, Smadar +2 more
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