THE SEVENTH DATA RELEASE OF THE SLOAN DIGITAL SKY SURVEY
THE SEVENTH DATA RELEASE OF THE SLOAN DIGITAL SKY SURVEY
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DOI：
10.1088/0067-0049/182/2/543
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发表时间：
2009-06-01
影响因子：
8.7
通讯作者：
Zucker, Daniel B.
中科院分区：
文献类型：
--
作者：
Abazajian, Kevork N.;Adelman-McCarthy, Jennifer K.;Zucker, Daniel B.
本文介绍了斯隆数字巡天（SDSS）的第七次数据发布，标志着SDSS最初目标的完成和SDSS-II阶段的结束。它包括11，663度（2）的成像数据，其中大部分类似于2000度（2）的增量比以前的数据发布位于银河系低纬度地区。该目录包含3.57亿个不同天体的五波段测光。该调查还包括在南银河帽沿着天球赤道的120度长，2度.5宽的条纹上重复测光，其中一些区域被多达90个单独的成像运行所覆盖。我们包括了这些数据中最好的一个，在250度的范围内比主巡天大约暗2等（2）。这次巡天已经完成了9380度（2）的光谱测量;现在已经完成了北方银帽一个大的连续区域的光谱测量，缩小了以前数据发布中存在的差距。总共有超过160万个光谱，包括930，000个星系，120，000个类星体和460，000颗恒星。发布的数据包括改进了银河系低纬度的恒星测光。天体测量都已经用USNO CCD天体仪目录的第二版重新校准，将亮端的均方根统计误差减少到每个坐标45毫角秒。我们进一步量化的系统误差在明亮的星系测光由于贫穷的天空测定，这个问题是不那么严重，比以前报道的大多数星系。最后，我们描述了一系列的改进，光谱减少，包括更好的平场和改进的波长校准在蓝端，更好地处理具有极强的窄发射线的对象，和改进的恒星金属丰度的测定。
This paper describes the Seventh Data Release of the Sloan Digital Sky Survey (SDSS), marking the completion of the original goals of the SDSS and the end of the phase known as SDSS-II. It includes 11,663 deg(2) of imaging data, with most of the similar to 2000 deg(2) increment over the previous data release lying in regions of low Galactic latitude. The catalog contains five-band photometry for 357 million distinct objects. The survey also includes repeat photometry on a 120 degrees long, 2 degrees.5 wide stripe along the celestial equator in the Southern Galactic Cap, with some regions covered by as many as 90 individual imaging runs. We include a co-addition of the best of these data, going roughly 2 mag fainter than the main survey over 250 deg(2). The survey has completed spectroscopy over 9380 deg(2); the spectroscopy is now complete over a large contiguous area of the Northern Galactic Cap, closing the gap that was present in previous data releases. There are over 1.6 million spectra in total, including 930,000 galaxies, 120,000 quasars, and 460,000 stars. The data release includes improved stellar photometry at low Galactic latitude. The astrometry has all been recalibrated with the second version of the USNO CCD Astrograph Catalog, reducing the rms statistical errors at the bright end to 45 milliarcseconds per coordinate. We further quantify a systematic error in bright galaxy photometry due to poor sky determination; this problem is less severe than previously reported for the majority of galaxies. Finally, we describe a series of improvements to the spectroscopic reductions, including better flat fielding and improved wavelength calibration at the blue end, better processing of objects with extremely strong narrow emission lines, and an improved determination of stellar metallicities.