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首页> 外文期刊>The Astrophysical Journal. Supplement Series >A Catalog of the Most Optically Luminous Galaxies at z < 0.3: Super Spirals, Super Lenticulars, Super Post-mergers, and Giant Ellipticals
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A Catalog of the Most Optically Luminous Galaxies at z < 0.3: Super Spirals, Super Lenticulars, Super Post-mergers, and Giant Ellipticals

机译：在Z <0.3：超级螺旋，超级晶状体，超级折叠和巨型椭圆形的最具光学发光星系目录

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摘要

We present a catalog of the 1525 most optically luminous galaxies from the Sloan Digital Sky Survey with r-band luminosity L-r > 8L* and redshift z <0.3, including 84 super spirals, 15 super lenticulars, 14 super post-merger galaxies, and 1400 giant ellipticals. With mass in stars of 10(11.3)-10(12)M(circle dot), super spirals and lenticulars are the most massive disk galaxies currently known. The specific star formation rates of super spirals place them on or below the star-forming main sequence. They must have formed stars at a high rate throughout their history in order to grow their massive, gigantic stellar disks and maintain their blue u - r integrated colors. Their disks are red on the inside and blue on the outside, consistent with inside-out growth. They tend to have small bulge-to-total (B/T) r-band luminosity ratios, characteristic of disk building via minor mergers and cold accretion. A large percentage of super disk galaxies (41%) have double nuclei, double disks, or other signatures of ongoing mergers. Most (72%) are found in moderate- to low-density environments, while the rest are found at the outskirts of clusters. It is likely that super spirals survive in these environments because they continue to accrete cold gas and experience only minor mergers at late times, by virtue of their enormous masses and angular momenta. We suggest that super post-mergers are the product of super spiral major mergers and may be the precursors of some giant elliptical galaxies found in low-density environments. We present two new gravitational lens candidates in an appendix.
机译：我们在斯隆数字天空测量中展示了1525个最光学发光星系的目录，使用R带亮度LR> 8L *和Redshift Z <0.3，包括84个超级螺旋，15个超级晶状体，14个超级合并的星系，1400巨大的椭圆形。在10（11.3）-10（12）米（圆点）的恒星中，超级螺旋和晶状体是目前已知的最巨大的磁盘星系。超级螺旋的特定恒星形成速率将它们放在恒星形成的主序列上或下方。他们必须在他们的历史中以高速率形成星星，以便种植巨大，巨大的恒星磁盘并保持其蓝色U-R综合色彩。他们的磁盘在内部和蓝色上是红色的，与内外增长一致。它们倾向于具有小膨胀 - 总（B / T）R带光度比，通过轻微的合并和冷吸收的磁盘建筑物的特性。大量的超级磁盘星系（41％）具有双重核，双磁盘或其他持续兼并的其他签名。大多数（72％）在中等至低密度的环境中发现，而其余的位置在群簇的郊区找到。超级螺旋可能在这些环境中存活，因为它们继续冷气，并且只有巨大的群众和角动势，迟到时期只经历轻微的合并。我们建议超级合并后的主要螺旋主要合并产品，并且可能是在低密度环境中发现的一些巨型椭圆星系的前体。我们在附录中展示了两个新的重力镜头候选人。

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