First observation of the thermal Sunyaev-Zel'dovich effect with kinetic inductance detectors
First observation of the thermal Sunyaev-Zel'dovich effect with kinetic inductance detectors
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首次用动感电感探测器观察热 Sunyaev-Zeldovich 效应
DOI：
10.1051/0004-6361/201322902
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发表时间：
2014
影响因子：
6.5
通讯作者：
Adam R
中科院分区：
文献类型：
--
作者：
Adam R
背景星系团提供了有关宇宙演化和大尺度结构的宝贵信息。最近通过热 Sunyaev-Zel'dovich (tSZ) 效应进行的星团观测已被证明是检测和研究它们的强大工具。在这种情况下，高分辨率 tSZ 观测（约数十角秒）对于探测中红移星团和高红移星团特别感兴趣。目的 tSZ 效应的观测将使用毫米级双波段 NIKA2 相机进行，基于 2015 年安装在 IRAM 30 米望远镜上的动感电感探测器 (KID)。为了证明这种仪器的潜力，我们展示了使用 NIKA 相机进行的 tSZ 观测原型机由两个由 132 个和 224 个探测器组成的阵列组成，分别在 140 和 240 GHz 下观测，角分辨率分别为 18.5 和 12.5 角秒。方法在 140 和 240 GHz 下同时观测集群 RX J1347.5-1145。我们使用频谱去相关技术来消除大气噪声并获得 140 GHz 的簇图。该过程的效率已通过观测的实际模拟来表征。结果观测到的 140 GHz 地图呈现出与信号 tSZ 性质一致的簇位置处的衰减。我们使用该图通过将 gNFW 模型拟合到数据来研究集群的压力分布。从地图中减去这个模型，我们确认 RX J1347.5-1145 是一个正在进行的合并，这证实并补充了之前的 tSZ 和 X 射线观测结果。结论我们首次证明了基于 KID 的仪器的 tSZ 功能。 NIKA2 相机具有约 5000 个探测器和 6.5 弧分视场，非常适合对中到高红移的星团内介质进行深入研究，从而能够表征普朗克卫星最近检测到的星团。
ContextClusters of galaxies provide valuable information on the evolution of the Universe and large scale structures. Recent cluster observations via the thermal Sunyaev-Zel’dovich (tSZ) effect have proven to be a powerful tool to detect and study them. In this context, high resolution tSZ observations (~tens of arcsec) are of particular interest to probe intermediate and high redshift clusters.AimsObservations of the tSZ effect will be carried out with the millimeter dual-band NIKA2 camera, based on kinetic inductance detectors (KIDs) to be installed at the IRAM 30-m telescope in 2015. To demonstrate the potential of such an instrument, we present tSZ observations with the NIKA camera prototype, consisting of two arrays of 132 and 224 detectors that observe at 140 and 240 GHz with a 18.5 and 12.5 arcsec angular resolution, respectively.MethodsThe cluster RX J1347.5-1145 was observed simultaneously at 140 and 240 GHz. We used a spectral decorrelation technique to remove the atmospheric noise and obtain a map of the cluster at 140 GHz. The efficiency of this procedure has been characterized through realistic simulations of the observations.ResultsThe observed 140 GHz map presents a decrement at the cluster position consistent with the tSZ nature of the signal. We used this map to study the pressure distribution of the cluster by fitting a gNFW model to the data. Subtracting this model from the map, we confirm that RX J1347.5-1145 is an ongoing merger, which confirms and complements previous tSZ and X-ray observations.ConclusionsFor the first time, we demonstrate the tSZ capability of KID based instruments. The NIKA2 camera with ~5000 detectors and a 6.5 arcmin field of view will be well-suited for in-depth studies of the intra cluster medium in intermediate to high redshifts, which enables the characterization of recently detected clusters by thePlancksatellite.