Issue |
A&A
Volume 604, August 2017
|
|
---|---|---|
Article Number | A132 | |
Number of page(s) | 16 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361/201730628 | |
Published online | 25 August 2017 |
The ALMA Frontier Fields Survey
II. Multiwavelength Photometric analysis of 1.1 mm continuum sources in Abell 2744, MACSJ0416.1-2403 and MACSJ1149.5+2223
1 Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK
e-mail: n.laporte@ucl.ac.uk
2 Instituto de Astrofísica and Centro de Astroingeniería, Pontificia Universidad Católica de Chile, Casilla 306, Santiago 22, Chile
3 Millennium Institute of Astrophysics, Chile
4 Space Science Institute, 4750 Walnut Street, Suite 205, Boulder, CO 80301, USA
5 CAS Key Laboratory for Research in Galaxies and Cosmology, University of Science and Technology of China, 230000 Hefei Shi, PR China
6 Department of Physics and Astronomy, Johns Hopkins University, 3400 N. Charles Street, Baltimore, MD 21218, USA
7 Departamento de Ciencias Físicas, Universidad Andres Bello, 252 Avenida República, Santiago, Chile
8 Núcleo de Astronomía de la Facultad de Ingeniería y Ciencias, Universidad Diego Portales, Av. Ejército 441, Santiago, Chile
9 Joint ALMA Observatory, 3107 Alonso de Córdova, Vitacura, Santiago, Chile
10 European Southern Observatory, Alonso de Córdova 3107, Vitacura, Casilla 19001, Santiago, Chile
11 Physics Department, Ben-Gurion University of the Negev, PO Box 653, 8410501 Be’er- Sheva, Israel
12 Department of Astronomy, Universidad de Concepcion, Casilla 160-C, Concepción, Chile
13 Zentrum für Astronomie, Institut für Theoretische Astrophysik, Philosophenweg 12, 69120 Heidelberg, Germany
14 Instituto de Física y Astronomía, Universidad de Valparaíso, Avda. Gran Bretaña 1111, Valparaíso, Chile
15 Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, USA
16 Institut de Recherche en Astrophysique et Planétologie (IRAP), Université de Toulouse, CNRS, UPS, 14 Av. Édouard Belin, 31400 Toulouse, France
17 School of Physics and Astronomy Queen Mary, University of London, 327 Mile End Road, London E1 4NS, UK
18 European Southern Observatory (ESO), Karl-Schwarzschild-Strasse 2, 85748 Garching, Germany
19 Leiden Observatory, Leiden University, 2300 RA Leiden, The Netherlands
20 Instituto de Astrofísica e Ciências do Espaço, Universidade de Lisboa, OAL, Tapada da Ajuda, 1349-018 Lisboa, Portugal
21 Space Telescope Science Institute, Baltimore, MD 21218, USA
22 Departamento de Ciencias Físicas, Universidad Andres Bello, 252 Avenida República, Santiago, Chile
23 Universidad Autónoma de Chile, Chile. Av. Pedro de Valdivia 425, Santiago, Chile
Received: 15 February 2017
Accepted: 29 June 2017
Context. The Hubble and Spitzer Space Telescope surveys of the Frontier Fields provide extremely deep images around six massive, strong-lensing clusters of galaxies. The ALMA Frontier Fields survey aims to cover the same fields at 1.1 mm, with maps reaching (unlensed) sensitivities of <70 μJy, in order to explore the properties of background dusty star-forming galaxies.
Aims. We report on the multi-wavelength photometric analysis of all 12 significantly detected (>5σ) sources in the first three Frontier Fields clusters observed by ALMA, based on data from Hubble and Spitzer, the Very Large Telescope and the Herschel Space Observatory.
Methods. We measure the total photometry in all available bands and determine the photometric redshifts and the physical properties of the counterparts via SED-fitting. In particular, we carefully estimate the far-infrared (FIR) photometry using 1.1 mm priors to limit the misidentification of blended FIR counterparts, which strongly affect some flux estimates in previous FIR catalogs. Due to the extremely red nature of these objects, we used a large range of parameters (e.g. 0.0 <Av< 20.0) and templates (including AGNs and ULIRGs models).
Results. We identify robust near-infrared (NIR) counterparts for all 11 sources with Ks detection, the majority of which are quite red, with eight having F814W − Ks ≳ 4 and five having F160W − [ 4.5 ] ≳ 3. From the FIR point of view, all our objects have zphot ~ 1–3, whereas based on the optical SED one object prefers a high-z solution (z ≥ 7). Five objects among our sample have spectroscopic redshifts from the GLASS survey for which we can reproduce their SEDs with existing templates. This verification confirms the validity of our photometric redshift methodology. The mean redshift of our sample is zphot = 1.99 ± 0.27. All 1.1 mm selected objects are massive (10.0 < log [ M⋆(M⊙) ] < 11.5), with high star formation rates (⟨ log [ SFR(M⊙/ yr) ] ⟩ ≈ 1.6) and high dust contents (8.1 < log [ Mdust(M⊙) ] < 8.8), consistent with previous ALMA surveys.
Key words: galaxies: high-redshift / galaxies: distances and redshifts / galaxies: photometry / radio continuum: galaxies / infrared: galaxies / submillimeter: galaxies
© ESO, 2017
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