加那利群岛天文台普朗克PSZ1源的光学确认和表征。II。ITP13第二年观测
Optical validation and characterisation of Planck PSZ1 sources at the Canary Islands observatories. II. Second year of ITP13 observations
摘要：
我们报告新的星系团以前未知的PSZ 1目录中包括。这里介绍的结果是在Roque de los Muchachos天文台（西班牙拉帕尔马）制定的为期两年的观测方案ITP 13的第二年取得的。为了将实际的星系团与SZ普朗克源联系起来，我们通过执行深光学成像和光谱学来识别75个SZ源，它们具有低SZ意义，SZ S/N $<5.32$。我们采用强大的标准，基于二维空间分布，丰富度和速度色散，以确认实际的光学同行$z<0.85$。在ITP 13观测计划结束时，我们研究了256个SZ源与$Dec \geq -15^{\circ}$（其中212个完全未知），找到光学对应的152 SZ源。ITP 13验证计划使我们能够更新PSZ 1纯度，现在更精确，在低SZ S/N范围内从72%增加到83%。我们的结果是一致的预测纯度曲线的完整的PSZ 1目录和预期的分数所造成的非高斯噪声的前景信号的错误检测。事实上，我们发现未经证实的来源和弥漫的星系尘埃在857 GHz的热发射的数量之间有很强的相关性，从而增加了在低银河系纬度的假普朗克SZ检测的比例。
英文摘要：
We report new galaxy clusters previously unknown included in the PSZ1 catalogue. The results here presented have been achieved during the second year of a 2-year observational programme, the ITP13, developed at the Roque de los Muchachos Observatory (La Palma, Spain). We characterise 75 SZ sources with low SZ significance, SZ S/N$<5.32$ by performing deep optical imaging and spectroscopy in order to associate actual galaxy clusters to the SZ Planck source. We adopt robust criteria, based on the 2D-spatial distribution, richness and velocity dispersions to confirm actual optical counterparts up to $z<0.85$. At the end of the ITP13 observational programme, we study 256 SZ sources with $Dec \geq -15^{\circ}$ (212 of them completely unknown), finding optical counterparts for 152 SZ sources. The ITP13 validation programme has allowed us to update the PSZ1 purity, which is now more refined, increasing from 72\% to 83\% in the low SZ S/N regime. Our results are consistent with the predicted purity curve for the full PSZ1 catalogue and with the expected fraction of false detections caused by the non-Gaussian noise of foreground signals. Indeed, we find a strong correlation between the number of unconfirmed sources and the thermal emission of diffuse galactic dust at 857 GHz, thus increasing the fraction of false Planck SZ detections at low galactic latitudes.
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