Astronomy and Astrophysics – Astrophysics
Scientific paper
1995-10-24
Astrophys.J.468:214,1996
Astronomy and Astrophysics
Astrophysics
31 pages, with 10 figures included. Postscript. Submitted to ApJ. Latest version (and color figures) at http://astro.berkele
Scientific paper
10.1086/177684
We compute the angular power spectrum C_l from the BATSE 3B catalog of 1122 gamma-ray bursts, and find no evidence for clustering on any scale. These constraints bridge the entire range from small scales (which probe source clustering and burst repetition) to the largest scales (which constrain possible anisotropies from the Galactic halo or from nearby cosmological large scale structures). We develop an analysis technique that takes the angular position errors into account, which enables us to place tight upper limits on the clustering down to scales l\approx 60, corresponding to a few degrees on the sky. The minimum-variance burst weighting that we employ is graphically visualized as an all-sky map where each burst is smeared out by an amount corresponding to its position uncertainty. We also present separate band-pass filtered sky maps for the quadrupole term and for the multipole-ranges l=3-10 and l=11-30, so that the fluctuations on different angular scales can be separately inspected for visual features such as localized ``hot spots" or structures aligned with the Galactic plane. These filtered maps reveal no apparent deviations from isotropy.
Briggs Michael
Hartmann Dieter
Meegan Charles
Tegmark Max
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