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Testing the accuracy of 3D-HST photometric redshift estimates as reference samples for deep weak lensing studies

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arxiv 2007.01211 v1 pith:ETH427MN submitted 2020-07-02 astro-ph.GA astro-ph.CO

S.F.Raihan , T.Schrabback , H.Hildebrandt , D.Applegate , G.Mahler This is my paper · ORCID
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keywords lensingweakdeepphotometricd-hstdataredshiftstudies
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abstract

Accurate weak lensing mass estimates of clusters are needed in order to calibrate mass proxies for the cosmological exploitation of galaxy cluster surveys. Such measurements require accurate knowledge of the redshift distribution of the weak lensing source galaxies. In this context, we investigate the accuracy of photometric redshifts (photo-$z$s) computed by the 3D-HST team for the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey fields, which provide a relevant photometric reference data set for deep weak lensing studies. Through the comparison to spectroscopic redshifts and photo-$z$s based on very deep data from the Hubble Ultra Deep Field, we identify catastrophic redshift outliers in the 3D-HST/CANDELS catalogue. These would significantly bias weak lensing results if not accounted for. We investigate the cause of these outliers and demonstrate that the interpolation of spectral energy distribution (SED) templates and a well-selected combination of photometric data can reduce the net impact for weak lensing studies.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Multiprobe Cosmology from the Abundance of SPT Clusters and DES Galaxy Clustering and Weak Lensing

    astro-ph.CO 2024-12 conditional novelty 6.0 of 10

    Combining SPT cluster counts with DES galaxy clustering and weak lensing yields Ωm=0.300±0.017, σ8=0.797±0.026, and S8=0.796±0.013, 1.6σ below Planck, with a ∑mν<0.25 eV limit when combined with Planck.

  2. Interacting Dark Sector (ETHOS $n=0$): Cosmological Constraints from SPT Cluster Abundance with DES and HST Weak Lensing Data

    astro-ph.CO 2024-11 conditional novelty 6.0 of 10

    Cluster abundance with weak-lensing masses sets the dark matter-dark radiation temperature ratio to ξ_DR < 0.098 at 95% credibility when combined with CMB and BAO data.

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