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The ASTRODEEP Frontier Fields catalogues: I. Multiwavelength photometry of Abell-2744 and MACS-J0416

Merlin, E. and Capak, P. (2016) The ASTRODEEP Frontier Fields catalogues: I. Multiwavelength photometry of Abell-2744 and MACS-J0416. Astronomy and Astrophysics, 590 . Art. No. A30. ISSN 0004-6361.

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Context. The Frontier Fields survey is a pioneering observational program aimed at collecting photometric data, both from space (Hubble Space Telescope and Spitzer Space Telescope) and from ground-based facilities (VLT Hawk-I), for six deep fields pointing at clusters of galaxies and six nearby deep parallel fields, in a wide range of passbands. The analysis of these data is a natural outcome of the Astrodeep project, an EU collaboration aimed at developing methods and tools for extragalactic photometry and creating valuable public photometric catalogues. Aims. We produce multiwavelength photometric catalogues (from B to 4.5 μm) for the first two of the Frontier Fields, Abell-2744 and MACS-J0416 (plus their parallel fields). Methods. To detect faint sources even in the central regions of the clusters, we develop a robust and repeatable procedure that uses the public codes Galapagos and Galfit to model and remove most of the light contribution from both the brightest cluster members, and the intra-cluster light. We perform the detection on the processed HST H160 image to obtain a pure H-selected sample, which is the primary catalogue that we publish. We also add a sample of sources which are undetected in the H160 image but appear on a stacked infrared image. Photometry on the other HST bands is obtained using SExtractor, again on processed images after the procedure for foreground light removal. Photometry on the Hawk-I and IRAC bands is obtained using our PSF-matching deconfusion code t-phot. A similar procedure, but without the need for the foreground light removal, is adopted for the Parallel fields. Results. The procedure of foreground light subtraction allows for the detection and the photometric measurements of ~2500 sources per field. We deliver and release complete photometric H-detected catalogues, with the addition of the complementary sample of infrared-detected sources. All objects have multiwavelength coverage including B to H HST bands, plus K-band from Hawk-I, and 3.6−4.5 μm from Spitzer. full and detailed treatment of photometric errors is included. We perform basic sanity checks on the reliability of our results. Conclusions. The multiwavelength photometric catalogues are available publicly and are ready to be used for scientific purposes. Our procedures allows for the detection of outshone objects near the bright galaxies, which, coupled with the magnification effect of the clusters, can reveal extremely faint high redshift sources. Full analysis on photometric redshifts is presented in Paper II.

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URLURL TypeDescription DOIArticle Paper
Capak, P.0000-0003-3578-6843
Additional Information:© 2016 ESO. 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. J.S.D. acknowledges the support of the European Research Council via the award of an advanced grant. F.B. acknowledges support by FCT via the postdoctoral fellowship SFRH/BPD/103958/2014 and also the funding from the programme UID/FIS/04434/2013.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
EC FP7 SPACE project ASTRODEEP312725
European Research Council (ERC)UNSPECIFIED
Fundação para a Ciência e a Tecnologia (FCT)SFRH/BPD/103958/2014
Fundação para a Ciência e a Tecnologia (FCT)UID/FIS/04434/2013
Subject Keywords:catalogs methods: data analysis galaxies: photometry galaxies: high-redshift
Record Number:CaltechAUTHORS:20160715-103831443
Persistent URL:
Official Citation:The ASTRODEEP Frontier Fields catalogues - I. Multiwavelength photometry of Abell-2744 and MACS-J0416 E. Merlin, R. Amorín, M. Castellano, A. Fontana, F. Buitrago, J. S. Dunlop, D. Elbaz, A. Boucaud, N. Bourne, K. Boutsia, G. Brammer, V. A. Bruce, P. Capak, N. Cappelluti, L. Ciesla, A. Comastri, F. Cullen, S. Derriere, S. M. Faber, H. C. Ferguson, E. Giallongo, A. Grazian, J. Lotz, M. J. Michałowski, D. Paris, L. Pentericci, S. Pilo, P. Santini, C. Schreiber, X. Shu and T. Wang A&A, 590 (2016) A30 DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:69052
Deposited By: Ruth Sustaita
Deposited On:27 Jul 2016 21:02
Last Modified:03 Oct 2019 10:18

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