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The angular power spectrum of batse 3b gamma-ray bursts
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Tegmark, Max Hartmann, Dieter H. Meegan, Charles A. Briggs, Michael S. |
| Copyright Year | 1996 |
| Description | We compute the angular power spectrum C(sub 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 anisotropics from the Galactic halo or from nearby cosmological large-scale structures). We develop an analysis technique that takes the angular position errors into account. For specific clustering or repetition models, strong upper limits can be obtained down to scales l approx. equal to 30, corresponding to a couple of degrees on the sky. The minimum-variance burst weighting that we employ is visualized graphically as an all-sky map in which each burst is smeared out by an amount corresponding to its position uncertainty. We also present separate bandpass-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 inspected separately for visual features such as localized 'hot spots' or structures aligned with the Galactic plane. These filtered maps reveal no apparent deviations from isotropy. |
| File Size | 1190166 |
| Page Count | 14 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19970022990 |
| Archival Resource Key | ark:/13960/t6q004p4h |
| Language | English |
| Publisher Date | 1996-09-01 |
| Access Restriction | Open |
| Subject Keyword | Space Radiation Astronomical Catalogs Statistical Analysis Power Spectra Stochastic Processes Gamma Ray Observatory Bandpass Filters Gamma Ray Bursts Quadrupoles Halos Variance Statistics Anisotropy Multipoles Cosmology Angular Distribution Position Errors Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
