Title: Star formation in AGN hosts in GOODS-N Show Chinese title

Title: 星系活跃中心（AGN）寄主中的恒星形成——GOODS-N中的情况

Abstract: Sensitive Herschel far-infrared observations can break degeneracies that were inherent to previous studies of star formation in high-z AGN hosts. Combining PACS 100 and 160um observations of the GOODS-N field with 2Msec Chandra data, we detect ~20% of X-ray AGN individually at >3sig. The host far-infrared luminosity of AGN with L2-10~10^43erg/s increases with redshift by an order of magnitude from z=0 to z~1. In contrast, there is little dependence of far-infrared luminosity on AGN luminosity, for L2-10<~10^44erg/s AGN at z>~1. We do not find a dependence of far-infrared luminosity on X-ray obscuring column, for our sample which is dominated by L2-10<10^44erg/s AGN. In conjunction with properties of local and luminous high-z AGN, we interpret these results as reflecting the interplay between two paths of AGN/host coevolution. A correlation of AGN luminosity and host star formation is traced locally over a wide range of luminosities and also extends to luminous high z AGN. This correlation reflects an evolutionary connection, likely via merging. For lower AGN luminosities, star formation is similar to that in non-active massive galaxies and shows little dependence on AGN luminosity. The level of this secular, non-merger driven star formation increasingly dominates over the correlation at increasing redshift. Show Chinese abstract

Abstract: 灵敏的赫歇尔远红外观测能够打破之前高红移活动星系核（AGN）宿主星形成研究中存在的退化关系。 结合GOODS-N场的PACS 100和160微米观测数据与2Msec钱德拉数据，我们以>3倍标准差检测到约20%的单个X射线AGN。 对于L2-10~10^43erg/s的AGN，其宿主星系的远红外波段光度随红移从z=0增加到z~1的数量级上升。 相比之下，对于z>~1且L2-10<~10^44erg/s的AGN，远红外波段光度对AGN光度几乎没有依赖性。 对于主导样本为L2-10<10^44erg/s AGN的情况，我们未发现远红外波段光度与X射线消光柱之间的依赖关系。 结合本地及高红移明亮AGN的特性，我们将这些结果解释为反映两种AGN/宿主共同演化路径之间的相互作用。 AGN光度与宿主星形成之间的相关性在宽广的光度范围内被局部追踪，并延伸至高红移明亮AGN。 这种相关性反映了通过合并可能实现的进化联系。 对于较低AGN光度，恒星形成类似于非活动的大质量星系，并且对AGN光度几乎没有依赖性。 随着红移的增加，这种稳态、非合并驱动的恒星形成水平在相关性中的主导地位日益增强。