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Published September 10, 2015 | Published + Submitted
Journal Article Open

Environment of the submillimeter-bright massive starburst HFLS3 at z∼6.34


We describe the search for Lyman break galaxies (LBGs) near the submillimeter-bright starburst galaxy HFLS3 at z = 6.34 and a study on the environment of this massive galaxy during the end of reionization. We performed two independent selections of LBGs on images obtained with the Gran Telescopio Canarias (GTC) and the Hubble Space Telescope (HST) by combining nondetections in bands blueward of the Lyman break and color selection. A total of 10 objects fulfilling the LBG selection criteria at z > 5.5 were selected over the 4.54 and 55.5 arcmin^2 covered by our HST and GTC images, respectively. The photometric redshift, UV luminosity, and star formation rate of these sources were estimated with models of their spectral energy distribution. These z ~ 6 candidates have physical properties and number densities in agreement with previous results. The UV luminosity function at z ~ 6 and a Voronoi tessellation analysis of this field show no strong evidence for an overdensity of relatively bright objects (m_(F105W) < 25.9) associated with HFLS3. However, the overdensity parameter deduced from this field and the surface density of objects cannot exclude definitively the LBG overdensity hypothesis. Moreover, we identified three faint objects at less than 3'' from HFLS3 with color consistent with those expected for z ~ 6 galaxies. Deeper data are needed to confirm their redshifts and to study their association with HFLS3 and the galaxy merger that may be responsible for the massive starburst.

Additional Information

© 2015 The American Astronomical Society. Received 2015 April 17; accepted 2015 July 24; published 2015 September 8. Financial support for this work was provided by the Spanish MINECO under projects AYA2010-21697-C05-04 and FIS2012- 39162-C06-02, by the Chilean Basal-CATA PFB-06/2007 and CONICYT-Chile under the grant Gemini-CONICYT #32120003, and by NASA through grant HST-GO-13045 from the Space Telescope Science Institute, which is operated by Associated Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. Additional support for A.C., W.O., J.C., J. L.W., and C.M.C. was from NSF with AST-1313319. The Dark Cosmology Centre is funded by the Danish National Research Foundation (J.L.W.). S.O. acknowledges support from the Science and Technology Facilities Council [grant number ST/I000976/1]. D.R. acknowledges support from the Science and Technology Facilities Council (ST/K00106X/1). R.J.I. acknowledges support from the European Research Council in the form of Advanced Grant, COSMICISM, 321302. SPIRE has been developed by a consortium of institutes led by Cardiff Univ. (UK) and including Univ. Lethbridge (Canada); NAOC (China); CEA, LAM (France); IFSI, Univ. Padua (Italy); Stockholm Observatory (Sweden); Imperial College London, RAL, UCL-MSSL, UKATC, Univ. Sussex (UK); and Caltech, JPL, NHSC, Univ. Colorado (USA). This development has been supported by national funding agencies: CSA (Canada); NAOC (China); CEA, CNES, CNRS (France); ASI (Italy); MCINN (Spain); SNSB (Sweden); STFC, UKSA (UK); and NASA (USA).We thank José Acosta-Pulido for advice on the LIRIS observations and help with the LIRIS data reduction package. This work is based on observations made with the Gran Telescopio Canarias (GTC), installed in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias, on the island of La Palma. The William Herschel Telescope is operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofsica de Canarias. The data presented in this paper will be released through the Herschel Database in Marseille HeDaM (hedam.oamp.fr/HerMES) Facilities: GTC (OSIRIS), HST (ACS, WFC3), Spitzer (IRAC), WHT (LIRIS).

Attached Files

Submitted - 1504.04534v2.pdf

Published - Laporte_2015.pdf


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August 20, 2023
August 20, 2023