Mathematics – Logic
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.8504l&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #85.04; Bulletin of the American Astronomical Society, Vol. 24, p.1259
Mathematics
Logic
Scientific paper
The Cosmic Background Explorer (COBE) team recently reported the detection of fluctuations in the temperature of the microwave background radiation consistent with the Harrison-Zeldovich spectrum of density fluctuations on angular scales ~ 10(deg) -180(deg) . Surveys of galaxies show analogous behavior of the two-point angular correlation function on angular scales ~ 1(deg) or less. Future galaxy and quasar surveys will provide information on the behavior of the two-point correlation function on larger angular scales, but such surveys will face difficulties in determining the behavior on the largest angular scales due to the absorption of light by dust and gas in the Galaxy. In contrast, the Galaxy is transparent to gamma -rays. If gamma -ray bursts are cosmological in origin, the sources of the bursts may trace the large scale structure of luminous matter. We have carried out simulations assuming that gamma -ray burst sources are extragalactic and that they trace luminous matter. We explore the dependence of the results on the number of burst sources and on their positional errors. We find that, if the lifetime of the Compton Observatory is ~ 10 years, yielding the positions of ~ 3,000 gamma -ray bursts, and if the positional errors of the bursts can be reduced to ~ 2(deg) , it may well be possible to determine whether or not the two-dimensional correlation function for gamma -ray burst sources is consistent with the Harrison-Zeldovich spectrum of density fluctuations on angular scales ~ 2(deg) - 180(deg) . The angular distribution of gamma -ray bursts and maps of temperature fluctuations in the microwave background radiation would then allow comparison of the distribution of luminous matter and total (i.e., dark plus luminous) matter on large angular scales. Finally, we report preliminary results for the gamma -ray burst two-point angular correlation function derived from data obtained using the Burst and Transient Source Experiment (BATSE) on the Compton Observatory. This research was supported in part by NASA grants NAGW-830 and NAGW-1284, and NASA contract NASW-4690.
Lamb Don Q.
Quashnock Jean M.
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