ENVIRONMENT OF THE SUBMILLIMETER-BRIGHT MASSIVE STARBURST HFLS3 AT z similar to 6.34

N. Laporte (1) , I. Pérez-Fournon (2) , J. A. Calanog (2) , A. Cooray (3) , J. L. Wardlow , J. Bock (4) , C. Bridge , D. Burgarella (5) , R. S. Bussmann (2) , A. Cabrera-Lavers (6) , C. M. Casey (7) , D. L. Clements (2) , A. Conley (8) , H. Dannerbauer (9) , D. Farrah (10) , H. Fu , R. Gavazzi (11) , E. A. Gonzalez-Solares , R. J. Ivison (12) , B. Lo Faro (5) , B. Ma (13) , G. Magdis (14) , R. Marques-Chaves (2) , P. Martínez-Navajas (2) , S. J. Oliver (15) , W. A. Osage , D. Riechers (16, 17) , D. Rigopoulou (18, 19) , D. Scott , A. Streblyanska (2) , J. D. Vieira

1 IRAP - Institut de recherche en astrophysique et planétologie
2 AUTRES
3 CALTECH - California Institute of Technology
4 ONF - Office national des forêts
5 LAM - Laboratoire d'Astrophysique de Marseille
6 IAC - Instituto de Astrofisica de Canarias
7 IOA
8 University of Colorado [Boulder]
9 MPIA - Max-Planck-Institut für Astronomie
10 Department of Physics [Blacksburg]
11 IAP - Institut d'Astrophysique de Paris
12 ROE - Royal Observatory Edinburgh
13 IPNO - Institut de Physique Nucléaire d'Orsay
14 AIM (UMR7158 / UMR_E_9005 / UM_112) - Astrophysique Interprétation Modélisation
15 University of Sussex
16 Department of Astronomy [Ithaca]
17 Department of Astronomy [Pasadena]
18 Department of Physics [Oxford]
19 RAL Space - Space Science and Technology Department [Didcot]

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 \textgreater 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 similar to 6 candidates have physical properties and number densities in agreement with previous results. The UV luminosity function at z similar to 6 and a Voronoi tessellation analysis of this field show. no strong evidence for an overdensity of relatively bright objects (m(F105W) \textless 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 similar to 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.

Domaines: Astrophysique [astro-ph]

N. Laporte, I. Pérez-Fournon, J. A. Calanog, A. Cooray, J. L. Wardlow, et al.. ENVIRONMENT OF THE SUBMILLIMETER-BRIGHT MASSIVE STARBURST HFLS3 AT z similar to 6.34. The Astrophysical Journal, 2015, 810 (2), ⟨10.1088/0004-637X/810/2/130⟩. ⟨hal-01439966⟩