标题： 2dF星系红移巡天中的射电源：活动星系核、星暴星系及其宇宙演化 显示英文标题

标题： Radio sources in the 2dF Galaxy Redshift Survey: AGN, starburst galaxies and their cosmic evolution

摘要： 射电连续谱巡天可以在非常宽的红移范围内检测星系，使它们成为研究遥远宇宙的强大工具。 直到最近，识别微弱射电源的光学对应体并测量它们的红移仍是一个缓慢而费力的过程，只能对相对较小的星系样本进行。 将全天射电连续谱巡天数据与新的大范围红移巡天的光学光谱数据相结合，现在可以测量数以万计的射电发射星系的红移，同时明确确定每个星系中的射电辐射主要是来自活动星系核（AGN）还是与恒星形成相关的过程。 在此，我们介绍近期在2dF星系红移巡天中对射电源群体的一些研究结果，包括对当地恒星形成密度的新推导，并讨论利用射电和光学数据进行星系演化的未来研究前景。 显示英文摘要

摘要： Radio continuum surveys can detect galaxies over a very wide range in redshift, making them powerful tools for studying the distant universe. Until recently, though, identifying the optical counterparts of faint radio sources and measuring their redshifts was a slow and laborious process which could only be carried out for relatively small samples of galaxies. Combining data from all-sky radio continuum surveys with optical spectra from the new large-area redshift surveys now makes it possible to measure redshifts for tens of thousands of radio-emitting galaxies, as well as determining unambiguously whether the radio emission in each galaxy arises mainly from an active nucleus (AGN) or from processes related to star formation. Here we present some results from a recent study of radio-source populations in the 2dF Galaxy Redshift Survey, including a new derivation of the local star-formation density, and discuss the prospects for future studies of galaxy evolution using both radio and optical data.