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arXiv 1302.2663astro-ph.CO
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CASSOWARY光谱巡天:SDSS中引力透镜星系的新样本

The CASSOWARY spectroscopy survey: A new sample of gravitationally lensed galaxies in SDSS

Daniel P. Stark, Matthew Auger, Vasily Belokurov, Tucker Jones, Brant E. Robertson, Richard S. Ellis, David J. Sand, Alexei Moiseev, Will Eagle, Thomas Myers

摘要:

明亮的引力透镜星系为我们提供了高红移星系的最详细的图像。然而,由于极少数的超亮z~2透镜系统已证实的红移,大多数详细的光谱研究已被限制在他们的范围。为了增加可用于详细跟踪的明亮透镜星系的数量,我们在斯隆数字巡天(SDSS)中开展了一项光谱活动,目标是宽分离(>3角秒)星系-星系透镜候选者。在我们CASSOWARY调查的早期努力的基础上,我们针对SDSS中的候选星系-星系透镜系统的大样本,使用完善的搜索算法识别位于明亮的红色星系周围的蓝色弧状结构。在本文中,我们提出了一个新的红移目录包含25个透镜源SDSS通过光谱的候选星系星系透镜系统的后续确认。在这个新的样本中包括两个已知的z~2最亮的星系(r=19.6和19.7),一个z=1.43的低金属丰度(12 + log(O/H)~8.0)的极端星云线发射星系,以及许多可能进行详细跟踪的系统。源红移跨度为0.9&lt;z&lt;2.5(中位红移为1.9),它们的光学星等范围为19.6&lt;r <22.3. We present a brief source-by-source discussion of the spectroscopic properties extracted from our confirmatory spectra and discuss some initial science results. With more than 50 gravitationally lensed z>1星系,现在已经在SDSS中得到证实,很快就有可能第一次从对高红移最亮透镜系统的详细光谱研究中得出普遍的结论。

英文摘要:

Bright gravitationally lensed galaxies provide our most detailed view of galaxies at high redshift. Yet as a result of the small number of ultra-bright z~2 lensed systems with confirmed redshifts, most detailed spectroscopic studies have been limited in their scope. With the goal of increasing the number of bright lensed galaxies available for detailed follow-up, we have undertaken a spectroscopic campaign targeting wide separation (>3 arcsec) galaxy-galaxy lens candidates within the Sloan Digital Sky Survey (SDSS). Building on the earlier efforts of our CASSOWARY survey, we target a large sample of candidate galaxy-galaxy lens systems in SDSS using a well-established search algorithm which identifies blue arc-like structures situated around luminous red galaxies. In this paper, we present a new redshift catalog containing 25 lensed sources in SDSS confirmed through spectroscopic follow-up of candidate galaxy-galaxy lens systems. Included in this new sample are two of the brightest galaxies (r=19.6 and 19.7) galaxies known at z~2, a low metallicity (12 + log (O/H)~8.0) extreme nebular line emitting galaxy at z=1.43, and numerous systems for which detailed follow-up will be possible. The source redshifts span 0.9<z<2.5 (median redshift of 1.9), and their optical magnitudes are in the range 19.6<r<22.3. We present a brief source-by-source discussion of the spectroscopic properties extracted from our confirmatory spectra and discuss some initial science results. With more than 50 gravitationally lensed z>1 galaxies now confirmed within SDSS, it will soon be possible for the first time to develop generalized conclusions from detailed spectroscopic studies of the brightest lensed systems at high redshift.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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