Galaxy–Galaxy lensing in HSC: Validation tests and the impact of heterogeneous spectroscopic training sets

Galaxy–Galaxy lensing in HSC: Validation tests and the impact of heterogeneous spectroscopic training sets
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Galaxy - HSC 中的 Galaxy 透镜:验证测试和异构光谱训练集的影响

DOI:
10.1093/mnras/stz2968
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发表时间:
2019
影响因子:
4.8
通讯作者:
More, Surhud
More, Surhud
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Speagle, Joshua S.;Leauthaud, Alexie;Huang, Song;Bradshaw, Christopher P.;Ardila, Felipe;Capak, Peter L.;Eisenstein, Daniel J.;Masters, Daniel C.;Mandelbaum, Rachel;More, Surhud

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虽然测光红移(photo-z's)是当前和即将到来的大规模调查的关键成分,但目前可用于训练,验证和测试它们的高质量光谱红移在幅度和颜色方面都基本上不具有代表性。我们调查的性质和结构的这种偏见,通过跟踪如何从一个异构的训练样本的对象有助于photo-zpredictions作为一个函数的幅度和颜色,并说明,在固定的颜色的基础红移分布可以演变强烈作为一个函数的幅度。然后,我们测试了120 deg 2的HSC-SSP DR 1数据的星系-星系透镜信号的光谱完整性和photo-zbiases的鲁棒性,并发现它们的影响是次主导目前的统计不确定性。我们的方法提供了一个框架,以调查光谱的不完整性如何影响在未来的调查,如LSST和WFIRST的照片Z为基础的弱透镜的预测。
Although photometric redshifts (photo-z’s) are crucial ingredients for current and upcoming large-scale surveys, the high-quality spectroscopic redshifts currently available to train, validate, and test them are substantially non-representative in both magnitude and colour. We investigate the nature and structure of this bias by tracking how objects from a heterogeneous training sample contribute to photo-zpredictions as a function of magnitude and colour, and illustrate that the underlying redshift distribution at fixed colour can evolve strongly as a function of magnitude. We then test the robustness of the galaxy–galaxy lensing signal in 120 deg2of HSC–SSP DR1 data to spectroscopic completeness and photo-zbiases, and find that their impacts are sub-dominant to current statistical uncertainties. Our methodology provides a framework to investigate how spectroscopic incompleteness can impact photo-z-based weak lensing predictions in future surveys such as LSST andWFIRST.
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