Further Constraints on Galactic Coronal Models of BATSE Gamma-Ray Bursts: (1) Limits on Local Group Member Contributions, and (2) Implications for Spiral Arm Plus Coronal Distributions

Details Further Constraints on Galactic Coronal Models of BATSE Gamma-Ray Bursts: (1) Limits on Local Group Member Contributions, and (2) Implications for Spiral Arm Plus Coronal Distributions Further Constraints on Galactic Coronal Models of BATSE Gamma-Ray Bursts: (1) Limits on Local Group Member Contributions, and (2) Implications for Spiral Arm Plus Coronal Distributions

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...184.1505h&link_type=abstract

American Astronomical Society, 184th AAS Meeting, #15.05; Bulletin of the American Astronomical Society, Vol. 26, p.881

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Galactic coronal/extended halo models of gamma-ray burst spatial distributions and luminosity functions are analyzed and compared to BATSE observations using techniques described in Hakkila et al. (1994a, ApJ 422, 664) and Hakkila et al. (1994b, Proc. 1993 Hunts. Workshop). Local Group Galaxies other than the Milky Way and M31 do not appear able to contribute significantly in any coronal/extended halo scenario, as they would (1) raise the overall of the sample, and (2) show up in the two-point angular correlation function. Also, Galactic spiral arm/disk populations have been combined with coronal/extended halo populations to determine the extent to which they can be added without severely affecting sample isotropy. The models favor very low-luminosity spiral arm bursts (those that are so close that no spiral structure is noticeable) and/or small observed numbers of such bursts (less than 20% of the BATSE sample), while simultaneously constraining the spatial and luminosity properties of the coronal/extended halo population. This work has been supported by NASA grants NAG8-192 and NRA 92-OSSA-17.

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