Calibrating photometric redshifts with intensity mapping observations

被引：34
作者：
Alonso, David [1 ]
Ferreira, Pedro G. [1 ]
Jarvis, Matt J. [1 ,2 ]
Moodley, Kavilan [3 ]
机构：
[1] Oxford Astrophys, Dept Phys, Keble Rd, Oxford OX1 3RH, England
[2] Univ Western Cape, Dept Phys, ZA-7535 Bellville, South Africa
[3] Univ KwaZulu Natal, Sch Math Stat & Comp Sci, Astrophys & Cosmol Res Unit, ZA-4041 Durban, South Africa
来源：
PHYSICAL REVIEW D | 2017年 / 96卷 / 04期
基金：
英国科学技术设施理事会; 新加坡国家研究基金会; 欧洲研究理事会;
关键词：
CROSS-CORRELATIONS; CLUSTERING REDSHIFTS; POWER SPECTRUM; H I; DISTRIBUTIONS; REIONIZATION; UNIVERSE; FLUCTUATIONS; SUBTRACTION;
D O I：
10.1103/PhysRevD.96.043515
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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.
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页数：19
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