arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1002.3832astro-ph.CO
收藏

SDSS J094604 .90+183541.8:一个z=4.8的引力透镜类星体

SDSS J094604.90+183541.8: A Gravitationally Lensed Quasar at z=4.8

Ian D. McGreer, Patrick B. Hall, Xiaohui Fan, Fuyan Bian, Naohisa Inada, Masamune Oguri, Michael A. Strauss, Donald P. Schneider, Kara Farnsworth

摘要:

我们报告了在斯隆数字巡天(SDSS)中偶然发现的引力透镜类星体的发现。该天体编号为SDSS J094604.90+183541.8,最初被认为是一个明亮的红色星系,但SDSS光谱同时具有z=0.388星系和z=4.8类星体的特征。我们已经获得了额外的图像,将系统分解为两个类星体图像,间隔为3.06角秒,以及一个与其中一个类星体图像强烈混合的明亮星系。我们确认光谱的两个类星体的图像代表一个单一的透镜源在z=4.8,总放大率为3.2,我们推导出一个透镜星系的模型。这是目前已知的红移最高的透镜类星体。我们研究了从现有数据中选择这样一个不寻常的物体的问题,并简要讨论了透镜类星体调查的影响。

英文摘要:

We report the discovery of a gravitationally lensed quasar identified serendipitously in the Sloan Digital Sky Survey (SDSS). The object, SDSS J094604.90+183541.8, was initially targeted for spectroscopy as a luminous red galaxy, but the SDSS spectrum has the features of both a z=0.388 galaxy and a z=4.8 quasar. We have obtained additional imaging that resolves the system into two quasar images separated by 3.06 arcsec and a bright galaxy that is strongly blended with one of the quasar images. We confirm spectroscopically that the two quasar images represent a single lensed source at z=4.8 with a total magnification of 3.2, and we derive a model for the lensing galaxy. This is the highest redshift lensed quasar currently known. We examine the issues surrounding the selection of such an unusual object from existing data and briefly discuss implications for lensed quasar surveys.

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。

↑