标题： 高红移超新星在哈勃深场 显示英文标题

标题： High Redshift Supernovae in the Hubble Deep Field

摘要： 在使用原始1995年12月观测数据和HST在1997年12月较短（F814W中63000秒）观测期间的数据时，发现了两个超新星。 这两个超新星（SNe）分别与红移为0.95（光谱学）的明显星系相关，来自Cohen等人的工作（1996），以及红移为1.32（测光学）的星系，来自Fernandez-Soto、Lanzetta和Yahil的工作（1998）。 这些红移在0.95的情况下接近，而在1.32的情况下远超过以前报道的超新星的最大距离。 我们表明，在任一观测时期，对于接近峰值亮度的事件，我们的观测对z < 1.8的超新星是敏感的。 讨论了详细的模拟，这些模拟量化了从我们的搜索阶段开始出现虚假事件的水平，并作为超新星亮度和宿主星系红移函数的搜索完整性。 在两个HDF观测时期，类型Ia和类型II超新星数量随红移变化的情况与几项已发表的预测以及我们自己的详细计算进行了讨论。 对于小HDF区域，每观测时期平均检测频率为一个超新星，这与当前理论的预期一致。 显示英文摘要

摘要： Two supernovae detected in the Hubble Deep Field using the original December 1995 epoch and data from a shorter (63000 s in F814W) December 1997 visit with HST are discussed. The supernovae (SNe) are both associated with distinct galaxies at redshifts of 0.95 (spectroscopic) from Cohen etal. (1996) and 1.32 (photometric) from the work of Fernandez-Soto, Lanzetta, and Yahil (1998). These redshifts are near, in the case of 0.95, and well beyond for 1.32 the greatest distance reported previously for SNe. We show that our observations are sensitive to SNe to z < 1.8 in either epoch for an event near peak brightness. Detailed simulations are discussed that quantify the level at which false events from our search phase would start to to arise, and the completeness of our search as a function of both SN brightness and host galaxy redshift. The number of Type Ia and Type II SNe expected as a function of redshift in the two HDF epochs are discussed in relation to several published predictions and our own detailed calculations. A mean detection frequency of one SN per epoch for the small HDF area is consistent with expectations from current theory.