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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 693778.0, MPI für Astronomie / Publikationen_mpia
A history of the gamma-ray burst flux at the Earth from Galactic globular clusters
Authors:Domainko, W.; Bailer-Jones, C. A. L.; Feng, F.
Language:English
Date of Publication (YYYY-MM-DD):2013
Title of Journal:Monthly Notices of the Royal Astronomical Society
Volume:432
Issue / Number:1
Start Page:258
End Page:263
Review Status:Internal review
Audience:Experts Only
Abstract / Description:Nearby gamma-ray bursts (GRBs) are likely to have represented a significant threat to life on the Earth. Recent observations suggest that a significant source of such bursts is compact binary mergers in globular clusters. This link between globular clusters and GRBs offers the possibility to find time intervals in the past with higher probabilities of a nearby burst, by tracing globular cluster orbits back in time. Here we show that the expected flux from such bursts is not flat over the past 550 Myr but rather exhibits three broad peaks, at 70, 180 and 340 Myr ago. The main source for nearby GRBs for all three time intervals is the globular cluster 47 Tuc, a consequence of its large mass and high stellar encounter rate, as well as the fact that it is one of the globular clusters that come quite close to the Sun. Mass extinction events indeed coincide with all three time intervals found in this study, although a chance coincidence is quite likely. Nevertheless, the identified time intervals can be used as a guide to search for specific signatures of GRBs in the geological record around these times.
Free Keywords:astrobiology; gamma-ray burst: general; globular clusters: general; Galaxy: kinematics and dynamics
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0035-8711 [ID No:1]
URL:http://cdsads.u-strasbg.fr/abs/2013MNRAS.432..258D [ID No:2]
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