The Sloan Digital Sky Survey Quasar Catalog. IV. Fifth Data Release
The Sloan Digital Sky Survey Quasar Catalog. IV. Fifth Data Release
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DOI：
10.1086/518474
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发表时间：
2007-04
期刊：
影响因子：
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通讯作者：
D. Schneider;P. Hall;G. Richards;G. Richards;M. Strauss;D. Berk;S. Anderson;W. Brandt;
中科院分区：
文献类型：
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作者：
D. Schneider;P. Hall;G. Richards;G. Richards;M. Strauss;D. Berk;S. Anderson;W. Brandt;
我们介绍了斯隆数字巡天（SDSS）类星体目录的第四版。该目录载有77，429件物体;比上一版增加了30，000多件条目。该星表包含SDSS第五次数据发布中亮度大于Mi = -22.0的天体（在H 0 = 70 km s-1 Mpc-1，ΩM = 0.3，ΩΛ = 0.7的宇宙学中），至少有一条发射线的半高宽大于1000 km s-1，或具有有趣的/复杂的吸收特征，比i ≤ 15.0暗，并且具有高度可靠的红移。该目录覆盖的面积为15740 deg 2。类星体的红移范围从0.08到5.41，中值为1.48;星表中包含891个红移大于4的类星体，其中36个红移大于5。大约一半的目录类星体的i < 19;几乎所有类星体的i < 21。对于每个物体，目录提供的位置精确度优于每个坐标0.2英寸RMS、基于CCD的五波段（ugriz）测光（典型精度为0.03 mag）以及有关形态和选择方法的信息。该目录还包含了类星体的基本无线电，近红外和X射线发射特性，如果可用的话，从其他大面积的调查。经校准的数字光谱覆盖波长范围3800-9200 nm，光谱分辨率为2000 nm;可以使用目录中提供的信息从公共数据库中检索光谱。从星表条目中导出的类星体的平均SDSS颜色作为红移的函数，以表格的形式呈现。星表中大约96%的天体是由SDSS发现的。
We present the fourth edition of the Sloan Digital Sky Survey (SDSS) Quasar Catalog. The catalog contains 77,429 objects; this is an increase of over 30,000 entries since the previous edition. The catalog consists of the objects in the SDSS Fifth Data Release that have luminosities larger than Mi = -22.0 (in a cosmology with H0 = 70 km s-1 Mpc-1, ΩM = 0.3, and ΩΛ = 0.7), have at least one emission line with FWHM larger than 1000 km s-1 or have interesting/complex absorption features, are fainter than i ≈ 15.0, and have highly reliable redshifts. The area covered by the catalog is ≈5740 deg2. The quasar redshifts range from 0.08 to 5.41, with a median value of 1.48; the catalog includes 891 quasars at redshifts greater than 4, of which 36 are at redshifts greater than 5. Approximately half of the catalog quasars have i < 19; nearly all have i < 21. For each object the catalog presents positions accurate to better than 0.2″ rms per coordinate, five-band (ugriz) CCD-based photometry with typical accuracy of 0.03 mag, and information on the morphology and selection method. The catalog also contains basic radio, near-infrared, and X-ray emission properties of the quasars, when available, from other large-area surveys. The calibrated digital spectra cover the wavelength region 3800-9200 Å at a spectral resolution of ≃2000; the spectra can be retrieved from the public database using the information provided in the catalog. The average SDSS colors of quasars as a function of redshift, derived from the catalog entries, are presented in tabular form. Approximately 96% of the objects in the catalog were discovered by the SDSS.