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

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...

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Published in:Monthly notices of the Royal Astronomical Society 2017-09, Vol.470 (1), p.95-113
Main 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.
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Language:English
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Summary: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 
ISSN:0035-8711
1365-2966
DOI:10.1093/mnras/stx1243