CLASH: accurate photometric redshifts with 14 HST bands in massive galaxy cluster cores

DOI: 
10.1093/mnras/stx1243
Publication date: 
01/08/2017
Main author: 
Molino, A.
IAA authors: 
Molino, A.;Benítez, N.;Schoenell, W.
Authors: 
Molino, A.;Benítez, N.;Ascaso, B.;Coe, D.;Postman, M.;Jouvel, S.;Host, O.;Lahav, O.;Seitz, S.;Medezinski, E.;Rosati, P.;Schoenell, W.;Koekemoer, A.;Jimenez-Teja, Y.;Broadhurst, T.;Melchior, P.;Balestra, I.;Bartelmann, M.;Bouwens, R.;Bradley, L.;Czakon, N.;Donahue, M.;Ford, H.;Graur, O.;Graves, G.;Grillo, C.;Infante, L.;Jha, S. W.;Kelson, D.;Lazkoz, R.;Lemze, D.;Maoz, D.;Mercurio, A.;Meneghetti, M.;Merten, J.;Moustakas, L.;Nonino, M.;Orgaz, S.;Riess, A.;Rodney, S.;Sayers, J.;Umetsu, K.;Zheng, W.;Zitrin, A.
Journal: 
Monthly Notices of the Royal Astronomical Society
Refereed: 
Yes
Publication type: 
Article
Volume: 
470
Pages: 
95-113
Abstract: 

We present accurate photometric redshifts for galaxies observed by the Cluster Lensing And Supernova survey with Hubble (CLASH). CLASH observed 25 massive galaxy cluster cores with the Hubble Space Telescope in 16 filters spanning 0.2-1.7 μm. Photometry in such crowded fields is challenging. Compared to our previously released catalogues, we make several improvements to the photometry, including smaller apertures, intracluster light subtraction, point spread function matching and empirically measured uncertainties. We further improve the Bayesian photometric redshift estimates by adding a redder elliptical template and by inflating the photometric uncertainties of the brightest galaxies. The resulting photometric redshift accuracies are dz/(1+z) ̃ 0.8, 1.0 and 2.0 per cent for galaxies with I-band F814W AB magnitudes 〈 18, 20 and 23, respectively. These results are consistent with our expectations. They improve on our previously reported accuracies by a factor of 4 at the bright end and a factor of 2 at the faint end. Our new catalogue includes 1257 spectroscopic redshifts, including 382 confirmed cluster members. We also provide stellar mass estimates. Finally, we include lensing magnification estimates of background galaxies based on our public lens models. Our new catalogue of all 25 CLASH clusters is available via Mikulski Archive for Space Telescopes. The analysis techniques developed here will be useful in other surveys of crowded fields, including the Frontier Fields and surveys carried out with Javalambre-Physics of the Accelerated Universe Astrophysical Survey and James Webb Space Telescope.

Database: 
ADS
SCOPUS
URL: 
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85021809134&doi=10.1093%2fmnras%2fstx1243&partnerID=40&md5=11a7398b36979f56e519de282f65cb4c
ADS Bibcode: 
2017MNRAS.470...95M
Keywords: 
catalogues;galaxies: clusters: general;galaxies: distances and redshifts;galaxies: clusters: intracluster medium;galaxies: photometry;ultraviolet: galaxies;Astrophysics - Astrophysics of Galaxies;Astrophysics - Cosmology and Nongalactic Astrophysics