Spectroscopy of quasar binary candidates

We present spectroscopy of binary quasar candidates, with component separations of 3"<={Delta}{theta}<6", selected from SDSS DR4 using kernel density estimation (KDE). Of...我们报道了双类星体候选体的光谱学观测结果，该类候选体的子体角距满足3″≤Δθ<6″，且通过核密度估计（KDE）从斯隆数字巡天第四版数据发布（SDSS DR4）中筛选得到。