Narrow line Seyfert 1 galaxies from SDSS-DR3

We carried out a systematic search for narrow line Seyfert 1 galaxies (NLS1s) from objects assigned as "QSOs" or "galaxies" in the spectroscopic sample of the Sloan Digital Sky...我们针对斯隆数字巡天（Sloan Digital Sky）光谱样本中被标记为"类星体（QSOs）"或"星系"的天体，开展了窄线赛弗特1星系（narrow line Seyfert 1 galaxies, NLS1s）的系统性搜寻。