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http://hdl.handle.net/20.500.12386/27545
Titolo: | Weak-lensing study in VOICE survey - I. Shear measurement | Autori: | Fu, Liping Liu, Dezi RADOVICH, MARIO Liu, Xiangkun Pan, Chuzhong Fan, Zuhui COVONE, GIOVANNI VACCARI, MATTIA Amaro, Valeria BRESCIA, Massimo CAPACCIOLI, Massimo De Cicco, Demetra GRADO, ANIELLO LIMATOLA, LUCA Miller, Lance NAPOLITANO, NICOLA ROSARIO Paolillo, Maurizio Pignata, Giuliano |
Data pubblicazione: | 2018 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 479 | Fascicolo: | 3 | Da pagina:: | 3858 | Abstract: | The VST Optical Imaging of the CDFS and ES1 Fields (VOICE) Survey is a Guaranteed Time programme carried out with the European Southern Observatory (ESO) VLT Survey Telescope (VST) telescope to provide deep optical imaging over two 4 deg<SUP>2</SUP> patches of the sky centred on the Chandra Deep Field South (CDFS) and ES1 as part of the ESO-Spitzer Imaging Extragalactic Survey. We present the cosmic shear measurement over the 4 deg<SUP>2</SUP> covering the CDFS region in the rband using LensFit. Each of the four tiles of 1 deg<SUP>2</SUP> has more than 100 exposures, of which more than 50 exposures passed a series of image quality selection criteria for weak-lensing study. The 5σ limiting magnitude in r band is 26.1 for point sources, which is ≳1 mag deeper than other weak-lensing survey in the literature [e.g. the Kilo Degree Survey (KiDS) at VST]. The photometric redshifts are estimated using the VOICE u, g, r, i together with near-infrared VIDEO data Y, J, H, K<SUB>s</SUB>. The mean redshift of the shear catalogue is 0.87, considering the shear weight. The effective galaxy number density is 16.35 gal arcmin<SUP>-</SUP><SUP>2</SUP>, which is nearly twice the one of KiDS. The performance of LensFit on such a deep data set was calibrated using VOICE-like mock image simulations. Furthermore, we have analysed the reliability of the shear catalogue by calculating the star-galaxy cross-correlations, the tomographic shear correlations of two redshift bins and the contaminations of the blended galaxies. As a further sanity check, we have constrained cosmological parameters by exploring the parameter space with Population Monte Carlo sampling. For a flat Λ cold dark matter model, we have obtained Σ_8=σ_8(Ω_m/0.3)^{0.5}=0.68^{+0.11}_{-0.15}. | URI: | http://hdl.handle.net/20.500.12386/27545 | URL: | http://arxiv.org/abs/1802.10282v2 https://academic.oup.com/mnras/article-abstract/479/3/3858/5037940?redirectedFrom=fulltext |
ISSN: | 0035-8711 | DOI: | 10.1093/mnras/sty1579 | Bibcode ADS: | 2018MNRAS.479.3858F | Fulltext: | open |
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