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The ASTRODEEP Frontier Fields catalogues II. Photometric redshifts and rest frame properties in Abell-2744 and MACS-J0416

Castellano, M. and Capak, P. (2016) The ASTRODEEP Frontier Fields catalogues II. Photometric redshifts and rest frame properties in Abell-2744 and MACS-J0416. Astronomy and Astrophysics, 590 . Art. No. A31. ISSN 0004-6361.

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Aims. We present the first public release of photometric redshifts, galaxy rest frame properties and associated magnification values in the cluster and parallel pointings of the first two Frontier Fields, Abell-2744 and MACS-J0416. The released catalogues aim to provide a reference for future investigations of extragalactic populations in these legacy fields: from lensed high-redshift galaxies to cluster members themselves. Methods. We exploit a multiwavelength catalogue, ranging from Hubble Space Telescope (HST) to ground-based K and Spitzer IRAC, which is specifically designed to enable detection and measurement of accurate fluxes in crowded cluster regions. The multiband information is used to derive photometric redshifts and physical properties of sources detected either in the H-band image alone, or from a stack of four WFC3 bands. To minimize systematics, median photometric redshifts are assembled from six different approaches to photo-z estimates. Their reliability is assessed through a comparison with available spectroscopic samples. State-of-the-art lensing models are used to derive magnification values on an object-by-object basis by taking into account sources positions and redshifts. Results. We show that photometric redshifts reach a remarkable ~3–5% accuracy. After accounting for magnification, the H-band number counts are found to be in agreement at bright magnitudes with number counts from the CANDELS fields, while extending the presently available samples to galaxies that, intrinsically, are as faint as H ~ 32−33, thanks to strong gravitational lensing. The Frontier Fields allow the galaxy stellar mass distribution to be probed, depending on magnification, at 0.5–1.5 dex lower masses with respect to extragalactic wide fields, including sources at M_(star) ~ 10^7–10^8 M_⊙ at z > 5. Similarly, they allow the detection of objects with intrinsic star formation rates (SFRs) >1 dex lower than in the CANDELS fields reaching 0.1–1 M_⊙/yr at z ~ 6–10.

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Additional Information:© ESO 2016. Received 6 October 2015. Accepted 13 March 2016. Published online 03 May 2016. The research leading to these results has received funding from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement No. 312725. R.J.M., E.M.Q., and A.M. acknowledge the support of the European Research Council via the award of a Consolidator Grant (PI McLure). The M0416 spectroscopic data were based on the ESO VLT Large Programme (prog.ID 186.A-0798, PI: P. Rosati). The financial support from PRIN-INAF 2014: Glittering Kaleidoscopes in the sky, the multifaceted nature and role of galaxy clusters (PI M. Nonino) is acknowledged. This work utilizes gravitational lensing models produced by PIs Bradač, Ebeling, Merten & Zitrin, Sharon, and Williams, funded as part of the HST Frontier Fields program conducted by STScI. STScI is operated by the Association of Universities for Research in Astronomy, Inc. under NASA contract NAS 5-26555. The lens models were obtained from the Mikulski Archive for Space Telescopes (MAST).
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
European Union Seventh Framework Programme (FP7/2007-2013)312725
European Research Council (ERC)UNSPECIFIED
Istituto Nazionale di Astrofisica (INAF)UNSPECIFIED
NASANAS 5-26555
Subject Keywords:catalogs galaxies: high-redshift methods: data analysis galaxies: distances and redshifts
Record Number:CaltechAUTHORS:20160715-103831779
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Official Citation:The ASTRODEEP Frontier Fields catalogues - II. Photometric redshifts and rest frame properties in Abell-2744 and MACS-J0416 M. Castellano, R. Amorín, E. Merlin, A. Fontana, R. J. McLure, E. Mármol-Queraltó, A. Mortlock, S. Parsa, J. S. Dunlop, D. Elbaz, I. Balestra, A. Boucaud, N. Bourne, K. Boutsia, G. Brammer, V. A. Bruce, F. Buitrago, P. Capak, N. Cappelluti, L. Ciesla, A. Comastri, F. Cullen, S. Derriere, S. M. Faber, E. Giallongo, A. Grazian, C. Grillo, A. Mercurio, M. J. Michałowski, M. Nonino, D. Paris, L. Pentericci, S. Pilo, P. Rosati, P. Santini, C. Schreiber, X. Shu and T. Wang A&A, 590 (2016) A31 DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:69053
Deposited By: Ruth Sustaita
Deposited On:27 Jul 2016 20:37
Last Modified:27 Jul 2016 20:56

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