Discovery of two gravitationally lensed quasars in the Dark Energy Survey
Discovery of two gravitationally lensed quasars in the Dark Energy Survey
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DOI：
10.1093/mnras/stv2171
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发表时间：
2015-08
影响因子：
4.8
通讯作者：
A. Agnello;T. Treu;F. Ostrovski;P. Schechter;E. Buckley-Geer;Huan Lin;M. Auger;F. Courbin;C. Fassnacht;J. Frieman;N. Kuropatkin;P. Marshall;R. McMahon;G. Meylan;A. More;S. Suyu;C. Rusu;D. Finley;T. Abbott;F. Abdalla;S. Allam;J. Annis;M. Banerji;A. Benoit-Lévy;E. Bertin;D. Brooks;D. Burke;A. Rosell;M. Kind;J. Carretero;C. Cunha;C. D'Andrea;L. Costa;S. Desai;H. Diehl;J. Dietrich;P. Doel;T. Eifler;J. Estrada;A. F. Neto;B. Flaugher;P. Fosalba;D. Gerdes;D. Gruen;G. Gutiérrez;K. Honscheid;D. James;K. Kuehn;O. Lahav;M. Lima;M. Maia;M. March;J. Marshall;P. Martini;Peter Melchior;C. Miller;R. Miquel;R. Nichol;R. Ogando;A. Plazas;K. Reil;A. Romer;A. Roodman;M. Sako;E. Sánchez;B. Santiago;V. Scarpine;M. Schubnell;I. Sevilla-Noarbe;R. C. Smith;M. Soares-Santos;F. Sobreira;E. Suchyta;M. Swanson;G. Tarlé;J. Thaler;D. Tucker;A. Walker;Risa Wechsler;Yuanyuan Zhang
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文献类型：
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作者：
A. Agnello;T. Treu;F. Ostrovski;P. Schechter;E. Buckley-Geer;Huan Lin;M. Auger;F. Courbin;C. Fassnacht;J. Frieman;N. Kuropatkin;P. Marshall;R. McMahon;G. Meylan;A. More;S. Suyu;C. Rusu;D. Finley;T. Abbott;F. Abdalla;S. Allam;J. Annis;M. Banerji;A. Benoit-Lévy;E. Bertin;D. Brooks;D. Burke;A. Rosell;M. Kind;J. Carretero;C. Cunha;C. D'Andrea;L. Costa;S. Desai;H. Diehl;J. Dietrich;P. Doel;T. Eifler;J. Estrada;A. F. Neto;B. Flaugher;P. Fosalba;D. Gerdes;D. Gruen;G. Gutiérrez;K. Honscheid;D. James;K. Kuehn;O. Lahav;M. Lima;M. Maia;M. March;J. Marshall;P. Martini;Peter Melchior;C. Miller;R. Miquel;R. Nichol;R. Ogando;A. Plazas;K. Reil;A. Romer;A. Roodman;M. Sako;E. Sánchez;B. Santiago;V. Scarpine;M. Schubnell;I. Sevilla-Noarbe;R. C. Smith;M. Soares-Santos;F. Sobreira;E. Suchyta;M. Swanson;G. Tarlé;J. Thaler;D. Tucker;A. Walker;Risa Wechsler;Yuanyuan Zhang
我们根据暗能量巡天 (DES) 和广域红外巡天探测器 (WISE) 中发现的两个新的引力透镜类星体的多波段光度测量和 DES 图像中的扩展形态，对它们进行了光谱确认。 DES J0115-5244 的图像显示了一个红色星系，两侧有两个蓝色点源，这些图像是通过我们的长缝光谱数据获得的 zs = 1.64 处的同一类星体的图像。根据 DES 图像估计的爱因斯坦半径为 0.51 角秒。 DES J2146-0047 位于 DES 和斯隆数字巡天 (SDSS) 重叠的区域。 DES 和 SDSS 图像中可以看到两个蓝色成分。 SDSS 光纤光谱显示 zs = 2.38 处有类星体成分，zl = 0.799 处有 Mg II 和 Fe II 吸收，我们暂时将其与前景透镜星系联系起来。我们的长缝光谱表明蓝色成分是同一类星体的解析图像。爱因斯坦半径为 0.68 角秒，对应于 1.6 × 1011 Ms 的封闭质量。另外三个候选者被观察到并被拒绝，其中两个是低红移星暴星系对，一个是蓝色恒星后面的类星体。这些初步确认结果为应用于整个 DES 数据集的数据挖掘和基于模型的选择提供了重要的实证验证。
We present spectroscopic confirmation of two new gravitationally lensed quasars, discovered in the Dark Energy Survey (DES) and Wide-field Infrared Survey Explorer (WISE) based on their multiband photometry and extended morphology in DES images. Images of DES J0115-5244 show a red galaxy with two blue point sources at either side, which are images of the same quasar at zs = 1.64 as obtained by our long-slit spectroscopic data. The Einstein radius estimated from the DES images is 0.51 arcsec. DES J2146-0047 is in the area of overlap between DES and the Sloan Digital Sky Survey (SDSS). Two blue components are visible in the DES and SDSS images. The SDSS fibre spectrum shows a quasar component at zs = 2.38 and absorption by Mg II and Fe II at zl = 0.799, which we tentatively associate with the foreground lens galaxy. Our long-slit spectra show that the blue components are resolved images of the same quasar. The Einstein radius is 0.68 arcsec, corresponding to an enclosed mass of 1.6 × 1011 Ms. Three other candidates were observed and rejected, two being low-redshift pairs of starburst galaxies, and one being a quasar behind a blue star. These first confirmation results provide an important empirical validation of the data mining and model-based selection that is being applied to the entire DES data set.