标题： 哈罗11蓝色致密星系的微弱边缘：是否存在红色过量？ 显示英文标题

标题： The faint outskirts of the blue compact galaxy Haro 11: is there a red excess?

摘要： 先前对蓝致密星系（BCG）哈罗11的低表面亮度宿主的研究表明，该宿主星系的V-K=4.2+-0.8颜色异常偏红。这种颜色与广泛范围内的正常恒星种群（Z=0.001-0.02）不一致。其他BCG的宿主颜色类似但程度较轻，只要宿主的恒星金属度高于中心恒星爆发中的电离气体金属度，就可以与种群合成模型相协调。我们提供了迄今为止最深的哈罗11的V波段和K波段观测，并推导出宿主星系的新V-K颜色。我们的新数据表明颜色远不那么极端，为V-K=2.3+-0.2，这与具有与恒星形成中心的星云发射线得出的金属度相同的古老宿主星系的预期完全一致。 显示英文摘要

摘要： Previous studies of the low surface brightness host of the blue compact galaxy (BCG) Haro 11 have suggested an abnormally red color of V-K=4.2+-0.8 for the host galaxy. This color is inconsistent with any normal stellar population over a wide range of stellar metallicities (Z=0.001-0.02). Similar though less extreme host colors have been measured for other BCGs and may be reconciled with population synthesis models, provided that the stellar metallicity of the host is higher than that of the ionized gas in the central starburst. We present the deepest V and K band observations to date of Haro 11 and derive a new V-K color for the host galaxy. Our new data suggest a far less extreme colour of V-K=2.3+-0.2, which is perfectly consistent with the expectations for an old host galaxy with the same metallicty as that derived from nebular emission lines in the star-forming center.