Galaxy and Mass Assembly (GAMA): Exploring the WISE Web in G12
Galaxy and Mass Assembly (GAMA): Exploring the WISE Web in G12
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DOI：
10.3847/1538-4357/836/2/182
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发表时间：
2016-07
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通讯作者：
T. Jarrett;M. Cluver;C. Magoulas;Maciej Bilicki;M. Alpaslan;J. Bland-Hawthorn;S. Brough;M. J. I. Brown;S. Croom;S. Driver;B. Holwerda;A. Hopkins;J. Loveday;P. Norberg;J. Peacock;C. Popescu;E. Sadler;E. Taylor;R. Tuffs;L. Wang
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作者：
T. Jarrett;M. Cluver;C. Magoulas;Maciej Bilicki;M. Alpaslan;J. Bland-Hawthorn;S. Brough;M. J. I. Brown;S. Croom;S. Driver;B. Holwerda;A. Hopkins;J. Loveday;P. Norberg;J. Peacock;C. Popescu;E. Sadler;E. Taylor;R. Tuffs;L. Wang
我们对位于北银河帽的赤道GAMA G12场内的中红外广域红外巡天探测器（WISE）源进行了分析。我们的动机是研究和表征WISE源群的行为，以预测将定义未来十年的深多波长巡天，主要科学目标是绘制3D大尺度结构并确定宿主星系的全球物理属性。结合宇宙学红移，我们通过WISE W1 （3.4 μm）分辨发射来识别星系，我们还使用视星等、颜色和恒星计数的统计模型进行了恒星-星系分离。得到的星系表在60°g2内具有59万个源，其w15 σ深度为31 μJy。在红移不可用的暗端，我们采用光度函数分析表明，在17.5等（31 μJy）以内的所有WISE星系外源中，约有27%处于高红移。利用两点相关函数和5 Mpc和20 Mpc尺度下的三维光源密度表征来研究其空间分布。对于角分布，我们发现较亮、质量较大的源相对于较暗、质量较小的源具有较强的聚集；同样地，根据WISE的颜色，球状星系具有最强的群集，而晚型盘状星系具有最低的群集幅度。在三维空间中，我们发现许多不同的组合，通常由细丝和上层建筑连接。使用特殊的可视化工具，我们绘制了这些结构，探索星团如何在恒星质量和星系类型中发挥作用。
We present an analysis of the mid-infrared Wide-field Infrared Survey Explorer (WISE) sources seen within the equatorial GAMA G12 field, located in the North Galactic Cap. Our motivation is to study and characterize the behavior of WISE source populations in anticipation of the deep multiwavelength surveys that will define the next decade, with the principal science goal of mapping the 3D large-scale structures and determining the global physical attributes of the host galaxies. In combination with cosmological redshifts, we identify galaxies from their WISE W1 (3.4 μm) resolved emission, and we also perform a star-galaxy separation using apparent magnitude, colors, and statistical modeling of star counts. The resulting galaxy catalog has ≃590,000 sources in 60 deg2, reaching a W1 5σ depth of 31 μJy. At the faint end, where redshifts are not available, we employ a luminosity function analysis to show that approximately 27% of all WISE extragalactic sources to a limit of 17.5 mag (31 μJy) are at high redshift, . The spatial distribution is investigated using two-point correlation functions and a 3D source density characterization at 5 Mpc and 20 Mpc scales. For angular distributions, we find that brighter and more massive sources are strongly clustered relative to fainter sources with lower mass; likewise, based on WISE colors, spheroidal galaxies have the strongest clustering, while late-type disk galaxies have the lowest clustering amplitudes. In three dimensions, we find a number of distinct groupings, often bridged by filaments and superstructures. Using special visualization tools, we map these structures, exploring how clustering may play a role with stellar mass and galaxy type.