Mathematics – Logic
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21530304x&link_type=abstract
American Astronomical Society, AAS Meeting #215, #303.04; Bulletin of the American Astronomical Society, Vol. 42, p.300
Mathematics
Logic
Scientific paper
We developed a program to calculate redshift for all long-duration GRBs, with or without measured spectroscopic redshift. Our work is based on a presumed concordance cosmological model and various luminosity relations, e.g. Lag-L, Variability-L, Minimum-Rise-Time-L, Npeak-L, Epeak-L and Epeak-Egamma relations. These parameters are measured on all long-class Swift GRBs, and the redshifts are then measured for those GRBs. For GRBs with spectroscopic redshift measured, a comparison is made between the spectroscopic redshift and our calculated redshift, the result of which shows that our measured redshift is not biased, and our reported error bars are reasonably accurate, although much larger than those of the spectroscopic redshift. An updated and more complete Hubble Diagram is made on those GRBs with measured spectroscopic redshifts. A whole redshift catalog is made on all Swift long-class GRBs. This catalog is also used in determining the luminosity functions and massive-star formation rate throughout the universe.
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