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Record 84 of 4598
Tests and consequences of disk plus halo models of gamma-ray burst sources
External Online Source: doi:10.1086/175641
Author and Affiliation:
Smith, I. A.(Rice University, Houston, Texas, United States)
Abstract: The gamma-ray burst observations made by the Burst and Transient Source Experiment (BATSE) and by previous experiments are still consistent with a combined Galactic disk (or Galactic spiral arm) plus extended Galactic halo model. Testable predictions and consequences of the disk plus halo model are discussed here; tests performed on the expanded BATSE database in the future will constrain the allowed model parameters and may eventually rule out the disk plus halo model. Using examples, it is shown that if the halo has an appropriate edge, BATSE will never detect an anisotropic signal from the halo of the Andromeda galaxy. A prediction of the disk plus halo model is that the fraction of the bursts observed to be in the 'disk' population rises as the detector sensitivity improves. A careful reexamination of the numbers of bursts in the two populations for the pre-BATSE databases could rule out this class of models. Similarly, it is predicted that different satellites will observe different relative numbers of bursts in the two classes for any model in which there are two different spatial distribiutions of the sources, or for models in which there is one spatial distribution of the sources that is sampled to different depths for the two classes. An important consequence of the disk plus halo model is that for the birthrate of the halo sources to be small compared to the birthrate of the disk sources, it is necessary for the halo sources to release many orders of magnitude more energy over their bursting lifetime than the disk sources. The halo bursts must also be much more luminous than the disk bursts; if this disk-halo model is correct, it is necessary to explain why the disk sources do not produce halo-type bursts.
Publication Date: May 10, 1995
Document ID:
19950064062
(Acquired Dec 28, 1995)
Accession Number: 95A95661
Subject Category: ASTRONOMY
Document Type: Journal Article
Publication Information: Astrophysical Journal, Part 1; p. p. 686-693; (ISSN 0004-637X); 444; 2
Publisher Information: United States
Contract/Grant/Task Num: NAG5-1515
Financial Sponsor: NASA; United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Description: 8p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ACCRETION DISKS; ASTRONOMICAL MODELS; GALACTIC HALOS; GALACTIC STRUCTURE; GAMMA RAY BURSTS; ANDROMEDA GALAXY; ANISOTROPY; EMISSION SPECTRA; SPATIAL DISTRIBUTION
Imprint And Other Notes: Astrophysical Journal, Part 1 vol. 444, no. 2 p. 686-693 May 10, 1995
Availability Source: Other Sources
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