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Accurate photo-z in massive galaxy clusters

Alberto Molino
Universidade de São Paulo


The Cluster Lensing And Supernovae with Hubble (CLASH, Postman et al. 2012) survey is a Multi-Cycle Treasury program awarded with 524 HST orbits to image the cores of 25 massive galaxy clusters at intermediate redshifts (0.1<z<0.9). The survey combines the high spatial-resolution imaging from the ACS & WFC3 cameras with a specially selected 16-passband photometric filter system optimized for photometric redshift estimations which covers the whole UV+Optical+NIR wavelength range.

In this talk I will present a new photo-z pipeline for the CLASH=20 observations which reaches an accuracy of dz/1+z<1.0% for cluster=20 galaxies brighter than magnitude F814W < 20, dz/1+z < 2.0% for=20 magnitudes brighter than F814W < 22 and dz/1+z < 3.0% for magnitudes=20 brighter than F814W<23. Taking advantage of the superb quality data=20 and making use of the whole information contained in the redshift=20 probability distribution function P(z) for every galaxy, > 3600=20 cluster member candidates are identified over the 25 clusters. The=20 resulting sample, reaching an absolute magnitude MB < -13, represents=20 an excellent dataset for galaxy cluster evolution studies.

2016 February 17, 15:00

Observatório Astronómico de Lisboa (Seminar room)
Tapada da Ajuda, 1349-018 Lisboa

Faculdade de Ciências da Universidade de Lisboa Universidade do Porto Faculdade de Ciências e Tecnologia da Universidade de Coimbra
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia