Mathematics – Logic
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1133..464h&link_type=abstract
GAMMA-RAY BURST: Sixth Huntsville Symposium. AIP Conference Proceedings, Volume 1133, pp. 464-466 (2009).
Mathematics
Logic
Gamma-Ray Sources, Gamma-Ray Bursts, Quasars, Origin, Formation, And Abundances Of The Elements
Scientific paper
Abundance measurements with bright background light sources, such as quasars and GRBs, probe the large-scale distribution and the physical state of the baryonic components of cosmic gas- star-dark matter systems. Not all baryons inferred from big bang nucleosynthesis and the CMB are accounted for in the local Universe, and only a small fraction is trapped in compact objects. Most baryons probably reside in a warm-hot tenuous filamentary structure that traces the distribution of dark matter. The chemo-dynamical evolution of these baryons can be studied with absorption lines from bright, distant sources, in particular GRBs. Supernovae and galaxies are bright enough to be traced to high redshifts, but the diffuse gas in their vicinity is not luminous enough to be detectable in emission at cosmological distances. GRBs are ideal tools to pinpoint sites of cosmic star formation to very large distances, and simultaneously probe their hosts on galactic scales. Their large brightness allows abundances to be measured in low luminosity proto-galaxies that would otherwise not be found in ground-based surveys, and to trace abundances to the era of re-ionization at z>6.
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