Calibrating photometric redshifts with intensity mapping observations
Calibrating photometric redshifts with intensity mapping observations
复制标题
通过强度映射观测校准光度红移
DOI：
10.1103/physrevd.96.043515
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发表时间：
2017
影响因子：
5
通讯作者：
Alonso D
中科院分区：
文献类型：
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作者：
Alonso D
星系的成像巡天将具有高的数密度和角分辨率，但红移精度很差。中性氢的强度图将有精确的红移分辨率，但不会解决个别来源。利用这种互补性，我们展示了如何聚类红移方法提出的光谱调查也可以结合强度映射观测校准星系的红移分布在成像调查，因此，减少光度红移测量的不确定性。我们展示了如何与MeerKAT，HIRAX和SKA仪器进行强度映射调查可以改善光度红移的不确定性，远低于DES和LSST的要求。该方法的有效性作为仪器参数，前景减法和其他潜在的系统误差的函数进行了详细讨论。
Imaging surveys of galaxies will have a high number density and angular resolution yet a poor redshift precision. Intensity maps of neutral hydrogen will have accurate redshift resolution yet will not resolve individual sources. Using this complementarity, we show how the clustering redshifts approach proposed for spectroscopic surveys can also be used in combination with intensity mapping observations to calibrate the redshift distribution of galaxies in an imaging survey and, as a result, reduce uncertainties in photometric-redshift measurements. We show how the intensity mapping surveys to be carried out with the MeerKAT, HIRAX and SKA instruments can improve photometric-redshift uncertainties to well below the requirements of DES and LSST. The effectiveness of this method as a function of instrumental parameters, foreground subtraction and other potential systematic errors is discussed in detail.
DOI：
--
发表时间：
2006
期刊：
--
影响因子：
--
作者：
Iroon Polytechniou-
通讯作者：
Iroon Polytechniou-