The second data release of the Sloan Digital Sky Survey
The second data release of the Sloan Digital Sky Survey
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DOI：
10.1086/421365
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发表时间：
2004-07-01
影响因子：
5.3
通讯作者：
Zucker, DB
中科院分区：
文献类型：
--
作者：
Abazajian, K;Adelman-McCarthy, JK;Zucker, DB
斯隆数字巡天（SDSS）已经验证并公开了它的第二次数据发布。该数据发布包括超过8800万个独特物体的3324度(2)五波段（ugriz）成像数据，367360个星系、类星体、恒星的光谱，以及在该区域2627度(2)上选择的校准空白天空斑块，以及从这些数据中测量的参数表。成像数据的深度r接近22.2（点源的95%完备性极限），光度和天文测量分别校准为每个坐标2% rms和100 mas rms。成像数据都是通过新版SDSS成像管道处理的，自上次数据发布以来，最重要的改进是修复了模型拟合中每个对象的错误。结果是，模型震级现在可以很好地代表点震源的点扩散函数震级，代表扩展震源的Petrosian震级。光谱从3800延伸到92008，分辨率为2000。光谱学软件现在修复了某些类型恒星径向速度的系统误差，并大大改进了分光光度法。SDSS早期数据发布和首次数据发布中包含的所有数据都使用改进的管道重新处理，并包含在第二次数据发布中。还描述了数据的进一步特征，以及数据产品本身和访问它们的工具。
The Sloan Digital Sky Survey (SDSS) has validated and made publicly available its Second Data Release. This data release consists of 3324 deg(2) of five-band (ugriz) imaging data with photometry for over 88 million unique objects, 367,360 spectra of galaxies, quasars, stars, and calibrating blank sky patches selected over 2627 deg(2) of this area, and tables of measured parameters from these data. The imaging data reach a depth of r approximate to 22.2 ( 95% completeness limit for point sources) and are photometrically and astrometrically calibrated to 2% rms and 100 mas rms per coordinate, respectively. The imaging data have all been processed through a new version of the SDSS imaging pipeline, in which the most important improvement since the last data release is fixing an error in the model fits to each object. The result is that model magnitudes are now a good proxy for point-spread function magnitudes for point sources, and Petrosian magnitudes for extended sources. The spectroscopy extends from 3800 to 9200 8 at a resolution of 2000. The spectroscopic software now repairs a systematic error in the radial velocities of certain types of stars and has substantially improved spectrophotometry. All data included in the SDSS Early Data Release and First Data Release are reprocessed with the improved pipelines and included in the Second Data Release. Further characteristics of the data are described, as are the data products themselves and the tools for accessing them.