SUBMILLIMETER FOLLOW-UP OF WISE-SELECTED HYPERLUMINOUS GALAXIES
SUBMILLIMETER FOLLOW-UP OF WISE-SELECTED HYPERLUMINOUS GALAXIES
复制标题
DOI：
10.1088/0004-637x/756/1/96
复制
发表时间：
2012-08
期刊：
影响因子：
--
通讯作者：
Jingwen Wu;Chaowei Tsai;J. Sayers;D. Benford;C. Bridge;A. Blain;P. Eisenhardt;D. Stern;S. Petty-S.
中科院分区：
文献类型：
--
作者：
Jingwen Wu;Chaowei Tsai;J. Sayers;D. Benford;C. Bridge;A. Blain;P. Eisenhardt;D. Stern;S. Petty-S.
我们使用加州理工学院亚毫米天文台 (CSO) 来跟踪广域红外巡天探测器 (WISE) 选择的超发光星系样本，即所谓的 W1W2 缺失星系。这是一种罕见的（约 1000 个全天空）高红移星系群（峰值位于 z = 2-3），它们在 3.4 和 4.6 μm 处微弱或未被 WISE 检测到，但在 12 和 22 μm 处清晰检测到。大多数这些星系的光谱显示出显着的活跃星系核活动。我们用 SHARC-II 在 350-850 μm 处观测到了 14 个高红移 (z > 1.7) W1W2 缺失星系，有 9 次探测到；用 Bolocam 在 1.1 mm 处观测到了 18 个高红移 (z > 1.7) W1W2 缺失星系，有 5 次探测到。论文还介绍了 25 个 3.6 和 4.5 μm 目标的斯皮策暖光跟踪，以及 12 个目标的光谱。将 WISE 数据与温暖的 Spitzer 和 CSO 的观测结果相结合，我们构建了他们的中红外到毫米光谱能量分布 (SED)。这些 SED 具有一致的形状，显示出比其他星系模板更高的中红外与亚毫米比率，表明尘埃温度更高。我们使用单温度模型估计它们的尘埃温度为 60–120 K。它们的红外光度远远超过 1013 L☉。这些 SED 与现有的星系模板不太吻合，这表明它们是一个具有非常高光度和热尘埃的新种群。它们可能是宇宙中最明亮的星系之一。我们认为它们是发光的、被热尘埃遮蔽的星系（DOG）的极端例子，可能代表星系合并和演化过程中的一个短暂的演化阶段。要更好地了解它们的长波长特性，需要 ALMA 和 Herschel 数据。
We have used the Caltech Submillimeter Observatory (CSO) to follow-up a sample of Wide-field Infrared Survey Explorer (WISE) selected, hyperluminous galaxies, the so-called W1W2-dropout galaxies. This is a rare (∼1000 all-sky) population of galaxies at high redshift (peaks at z = 2–3), which are faint or undetected by WISE at 3.4 and 4.6 μm, yet are clearly detected at 12 and 22 μm. The optical spectra of most of these galaxies show significant active galactic nucleus activity. We observed 14 high-redshift (z > 1.7) W1W2-dropout galaxies with SHARC-II at 350–850 μm, with nine detections, and observed 18 with Bolocam at 1.1 mm, with five detections. Warm Spitzer follow-up of 25 targets at 3.6 and 4.5 μm, as well as optical spectra of 12 targets, are also presented in the paper. Combining WISE data with observations from warm Spitzer and CSO, we constructed their mid-IR to millimeter spectral energy distributions (SEDs). These SEDs have a consistent shape, showing significantly higher mid-IR to submillimeter ratios than other galaxy templates, suggesting a hotter dust temperature. We estimate their dust temperatures to be 60–120 K using a single-temperature model. Their infrared luminosities are well over 1013 L☉. These SEDs are not well fitted with existing galaxy templates, suggesting they are a new population with very high luminosity and hot dust. They are likely among the most luminous galaxies in the universe. We argue that they are extreme cases of luminous, hot dust-obscured galaxies (DOGs), possibly representing a short evolutionary phase during galaxy merging and evolution. A better understanding of their long-wavelength properties needs ALMA as well as Herschel data.