We present a theoretical study of double compact objects as potential short/hard gamma-ray burst (GRB) progenitors. An updated population synthesis code, StarTrack, is used to calculate properties of double neutron stars and black hole-neutron star binaries. We obtain their formation rates, estimate merger times, and finally predict their most likely merger locations and afterglow properties for different types of host galaxies. Our results serve for a direct comparison with the recent HETE-2 and Swift observations of several short bursts, for which afterglows and host galaxies were detected. We also discuss the possible constraints these observations put on the evolutionary models of double compact object formation. We emphasize that our double compact object models can successfully reproduce at the same time short GRBs within both young, star-forming galaxies (e.g., GRB 050709 and GRB 051221A), as well as within old, elliptical hosts (e.g., GRB 050724 and probably GRB 050509B).
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机译：我们目前对作为潜在的短/硬伽马射线爆发（GRB）祖细胞的双紧凑物体的理论研究。更新的总体合成代码StarTrack用于计算双中子星和黑洞中子星双星的属性。我们获得了它们的形成速率，估计了合并时间，最后预测了不同类型的宿主星系最可能的合并位置和余辉性质。我们的结果与最近HETE-2和Swift对几个短脉冲的观测结果进行了直接比较，针对这些观测发现了余辉和宿主星系。我们还讨论了这些观察对双重紧凑物体形成演化模型的可能约束。我们强调，我们的双重紧凑对象模型可以同时在年轻的恒星形成星系（例如GRB 050709和GRB 051221A）以及旧的椭圆形宿主（例如GRB 050724，甚至可能是椭圆形）中成功复制短的GRB。 GRB 050509B）。
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