The Arecibo Legacy Fast ALFA survey. II

In preparation for the full Arecibo Legacy Fast ALFA (ALFALFA) extragalactic HI survey, precursor observations were carried out in 2004 August-September with the seven-beam...为筹备完整的阿雷西博遗产快速ALFA（Arecibo Legacy Fast ALFA，简称ALFALFA）河外中性氢巡天项目，科研团队于2004年8月至9月使用七波束……开展了先导观测。