论文标题
伽马射线爆发的风力余星：耀斑，高原和陡峭的腐烂
Wind-powered afterglows of gamma-ray bursts: flares, plateaus and steep decays
论文作者
论文摘要
伽马射线爆发的余气通常会显示出耀斑，高原和突然的强度下降：这些时间特征很难解释为来自正向冲击。我们计算出早期GRB余潮的辐射特性，其逆向冲击（RS）的主要贡献在持久的中央发动机产生的超偏见（类似脉冲星）风中传播。 RS发射发生在快速冷却方案中 - 这确保了高辐射效率并允许快速强度变化。我们证明：（i）轻度风能，$ \ sim 10^{46} $ erg s $^{ - 1} $的订单，可以重现余泽的高原阶段； （ii）终止风会产生突然的陡峭衰减； （iii）风光度的轻度变化会产生短时的余辉耀斑。
Afterglows of gamma-ray bursts often show flares, plateaus, and sudden intensity drops: these temporal features are difficult to explain as coming from the forward shock. We calculate radiative properties of early GRB afterglows with the dominant contribution from the reverse shock (RS) propagating in an ultra-relativistic (pulsar-like) wind produced by the long-lasting central engine. RS emission occurs in the fast cooling regime -- this ensures high radiative efficiency and allows fast intensity variations. We demonstrate that: (i) mild wind power, of the order of $\sim 10^{46}$ erg s$^{-1}$, can reproduce the afterglows' plateau phase; (ii) termination of the wind can produce sudden steep decays; (iii) mild variations in the wind luminosity can produce short-duration afterglow flares.
