The Rates of Hypernovae and Gamma-Ray Bursts: Implications for Their Progenitors
Ph. PodsiadlowskiDepartment of Astrophysics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UKP. A. MazzaliDepartment of Astronomy and RESCEU, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-0033, JapanK. NomotoDepartment of Astronomy and RESCEU, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-0033, JapanD. LazzatiInstitute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UKE. CappellaroINAF-Osservatorio Astronomico di Capodimonte, via Moiariello 16, I-80131 Naples, Italy
2004en
ABI
Аннотация
A critical comparison of estimates for the rates of hypernovae (HNe) and gamma-ray bursts (GRBs) is presented. Within the substantial uncertainties, the estimates are shown to be quite comparable and give a Galactic rate of $10^{-6}$ -- $10^{-5} $yr$^{-1}$ for both events. These rates are several orders of magnitude lower than the rate of core-collapse supernovae, suggesting that the evolution leading to a HN/GRB requires special circumstances, very likely due to binary interactions. Various possible binary channels are discussed, and it is shown that these are generally compatible with the inferred rates.
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