Testing the accuracy of 3D-HST photometric redshift estimates as reference samples for deep weak lensing studies
arXiv:2007.01211 · doi:10.1093/mnras/staa1949
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-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-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.
17 pages, 14 figures, matches the version accepted for publication in MNRAS
References in corpus (15)
- EAZY: A Fast, Public Photometric Redshift Code
- COSMOS Photometric Redshifts with 30-bands for 2-deg2
- 3D-HST WFC3-selected Photometric Catalogs in the Five CANDELS/3D-HST Fields: Photometry, Photometric Redshifts and Stellar Masses
- The Hubble Ultra Deep Field
- Galaxy Clusters Discovered via the Sunyaev-Zel'dovich Effect in the 2500-square-degree SPT-SZ survey
- Galaxies in the Hubble Ultra Deep Field: I. Detection, Multiband Photometry, Photometric Redshifts, and Morphology
- The Canadian Cluster Comparison Project: detailed study of systematics and updated weak lensing masses
- A universal model for halo concentrations
- Cosmology and Astrophysics from Relaxed Galaxy Clusters II: Cosmological Constraints
- The MUSE 3D view of the Hubble Deep Field South
- UVUDF: Ultraviolet Through Near-infrared Catalog and Photometric Redshifts of Galaxies in the Hubble Ultra Deep Field
- The MUSE Hubble Ultra Deep Field Survey: II. Spectroscopic redshifts and comparisons to color selections of high-redshift galaxies
- Optimal filter systems for photometric redshift estimation
- HICOSMO - Cosmology with a complete sample of galaxy clusters: II. Cosmological results
- The MUSE Hubble Ultra Deep Field Survey: III. Testing photometric redshifts to 30th magnitude