THE GRISM LENS-AMPLIFIED SURVEY FROM SPACE (GLASS). IV. MASS RECONSTRUCTION OF THE LENSING CLUSTER ABELL 2744 FROM FRONTIER FIELD IMAGING AND GLASS SPECTROSCOPY
THE GRISM LENS-AMPLIFIED SURVEY FROM SPACE (GLASS). IV. MASS RECONSTRUCTION OF THE LENSING CLUSTER ABELL 2744 FROM FRONTIER FIELD IMAGING AND GLASS SPECTROSCOPY
复制标题
来自太空（玻璃）的严峻镜头放大调查。
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
M. Trenti
中科院分区：
文献类型：
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作者：
X. Wang;A. Hoag;K. Huang;T. Treu;M. Bradač;K. Schmidt;G. Brammer;B. Vulcani;T. Jones;R. Ryan Jr.;R. Amor'in;M. Castellano;A. Fontana;E. Merlin;M. Trenti
我们展示了大质量星团Abell 2744的强透镜和弱透镜重建，这是第一个可以获得深哈勃前沿场（HFF）图像和来自空间Grism透镜放大巡天（GLASS）的光谱的星团。通过在多个成像源中使用GLASS光谱对发射线进行目标搜索，我们获得了5个高置信度光谱红移和2个暂定红移。我们通过在所有三个多幅图像中检测相同的发射线来确认一个强透镜系统。我们还盲目地寻找额外的线发射体，并使用全GLASS光谱目录来测试微弱线发射体的光度红移的可靠性。当在光度红移估计中包括星云发射时，我们看到光度红移测量和光谱红移测量之间的合理一致。我们引入了一个严格的程序来识别基于颜色，形态和光谱学的安全多图像集。通过将7个具有安全光谱红移的多图像系统（在5个不同的红移平面上）与18个具有安全光度红移的多图像系统相结合，我们使用总共72张图像在自适应网格上重建了星团的引力势。将得到的质量图与深斯皮策前沿场数据获得的恒星质量图进行比较，以研究星团中恒星和暗物质的相对分布。我们发现恒星与总质量比在整个星团场中变化很大，这表明恒星在这个相互作用的系统中并不能精确地追踪总质量。汇聚图、剪切图和放大图以标准HFF格式提供。
We present a strong and weak lensing reconstruction of the massive cluster Abell 2744, the first cluster for which deep Hubble Frontier Fields (HFF) images and spectroscopy from the Grism Lens-Amplified Survey from Space (GLASS) are available. By performing a targeted search for emission lines in multiply imaged sources using the GLASS spectra, we obtain five high-confidence spectroscopic redshifts and two tentative ones. We confirm one strongly lensed system by detecting the same emission lines in all three multiple images. We also search for additional line emitters blindly and use the full GLASS spectroscopic catalog to test reliability of photometric redshifts for faint line emitters. We see a reasonable agreement between our photometric and spectroscopic redshift measurements, when including nebular emission in photometric redshift estimations. We introduce a stringent procedure to identify only secure multiple image sets based on colors, morphology, and spectroscopy. By combining 7 multiple image systems with secure spectroscopic redshifts (at 5 distinct redshift planes) with 18 multiple image systems with secure photometric redshifts, we reconstruct the gravitational potential of the cluster pixellated on an adaptive grid, using a total of 72 images. The resulting mass map is compared with a stellar mass map obtained from the deep Spitzer Frontier Fields data to study the relative distribution of stars and dark matter in the cluster. We find that the stellar to total mass ratio varies substantially across the cluster field, suggesting that stars do not trace exactly the total mass in this interacting system. The maps of convergence, shear, and magnification are made available in the standard HFF format.
DOI：
10.1088/0067-0049/199/2/25
发表时间：
2011-06
期刊：
The Astrophysical Journal Supplement Series
影响因子：
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作者：
M. Postman;D. Coe;N. Benı́tez;L. Bradley;T. Broadhurst;M. Donahue;H. Ford;O. Graur;G. Graves-G.-G
通讯作者：
M. Postman;D. Coe;N. Benı́tez;L. Bradley;T. Broadhurst;M. Donahue;H. Ford;O. Graur;G. Graves-G.-G