TY - JOUR
T1 - Primordial environment of supermassive black holes
T2 - II. Deep Y-and J-band images around the z ∼ 6.3 quasar SDSS J1030+0524
AU - Balmaverde, B.
AU - Gilli, R.
AU - Mignoli, M.
AU - Bolzonella, M.
AU - Brusa, M.
AU - Cappelluti, N.
AU - Comastri, A.
AU - Sani, E.
AU - Vanzella, E.
AU - Vignali, C.
AU - Vito, F.
AU - Zamorani, G.
N1 - Funding Information:
Acknowledgements. We are grateful to the referee for the careful reading of the manuscript and for the useful comments. We acknowledge financial contribution from the agreement ASI-INAF I/037/12/0. F.V. acknowledges support from Chandra X-ray Center grant GO4-15130A and the V.M. Willaman Endowment. This work is based on observations obtained with WIRCam, a joint project of CFHT, Taiwan, Korea, Canada, and France, at the Canada-France-Hawaii Telescope (CFHT) which is operated by the National Research Council (NRC) of Canada, the Institut National des Sciences de l’Univers of the Centre National de la Recherche Scientifique of France, and the University of Hawaii. Based on observations obtained with MegaPrime/MegaCam, a joint project of CFHT and CEA/DAPNIA, at the Canada-France-Hawaii Telescope (CFHT) which is operated by the National Research Council (NRC) of Canada, the Institut National des Sciences de l’Univers of the Centre National de la Recherche Scientifique (CNRS) of France, and the University of Hawaii. This work is based in part on data products produced at TERAPIX and the Canadian Astronomy Data Centre as part of the Canada-France-Hawaii Telescope Legacy Survey, a collaborative project of NRC and CNRS.
PY - 2017/10/1
Y1 - 2017/10/1
N2 - Many cosmological studies predict that early supermassive black holes (SMBHs) can only form in the most massive dark matter halos embedded within large-scale structures marked by galaxy overdensities that may extend up to ∼10 physical Mpc. This scenario, however, has not been confirmed observationally, as the search for galaxy overdensities around high-z quasars has returned conflicting results. The field around the z = 6:31 quasar SDSSJ1030+0524 (J1030) is unique for multi-band coverage and represents an excellent data legacy for studying the environment around a primordial SMBH. In this paper we present wide-area (∼250 × 250) Y-and J-band imaging of the J1030 field obtained with the near infrared camera WIRCam at the Canada-France-Hawaii Telescope (CFHT). We built source catalogs in the Y-and J-band, and matched those with our photometric catalog in the r, z, and i bands presented in our previous paper and based on sources with zAB < 25:2 detected using z-band images from the the Large Binocular Cameras (LBC) at the Large Binocular Telescope (LBT) over the same field of view. We used these new infrared data together with H and K photometric measurements from the MUlti-wavelength Survey by Yale-Chile (MUSYC) and with the Spitzer Infrared Array Camera (IRAC) data to refine our selection of Lyman break galaxies (LBGs), extending our selection criteria to galaxies in the range 25:2 < zAB < 25:7. We selected 21 robust high redshift candidates in the J1030 field with photometric redshift z ∼ 6 and colors i-z = 1:3. We found a significant asymmetry in the distribution of the high redshift galaxies in J1030, supporting the existence of a coherent large-scale structure around the quasar. We estimated an overdensity of z ∼ 6 galaxies in the field of d = 2:4, which is significant at >4s. The overdensity value and its significance are higher than those found in our previous paper and we interpret this as evidence of an improved LBG selection.
AB - Many cosmological studies predict that early supermassive black holes (SMBHs) can only form in the most massive dark matter halos embedded within large-scale structures marked by galaxy overdensities that may extend up to ∼10 physical Mpc. This scenario, however, has not been confirmed observationally, as the search for galaxy overdensities around high-z quasars has returned conflicting results. The field around the z = 6:31 quasar SDSSJ1030+0524 (J1030) is unique for multi-band coverage and represents an excellent data legacy for studying the environment around a primordial SMBH. In this paper we present wide-area (∼250 × 250) Y-and J-band imaging of the J1030 field obtained with the near infrared camera WIRCam at the Canada-France-Hawaii Telescope (CFHT). We built source catalogs in the Y-and J-band, and matched those with our photometric catalog in the r, z, and i bands presented in our previous paper and based on sources with zAB < 25:2 detected using z-band images from the the Large Binocular Cameras (LBC) at the Large Binocular Telescope (LBT) over the same field of view. We used these new infrared data together with H and K photometric measurements from the MUlti-wavelength Survey by Yale-Chile (MUSYC) and with the Spitzer Infrared Array Camera (IRAC) data to refine our selection of Lyman break galaxies (LBGs), extending our selection criteria to galaxies in the range 25:2 < zAB < 25:7. We selected 21 robust high redshift candidates in the J1030 field with photometric redshift z ∼ 6 and colors i-z = 1:3. We found a significant asymmetry in the distribution of the high redshift galaxies in J1030, supporting the existence of a coherent large-scale structure around the quasar. We estimated an overdensity of z ∼ 6 galaxies in the field of d = 2:4, which is significant at >4s. The overdensity value and its significance are higher than those found in our previous paper and we interpret this as evidence of an improved LBG selection.
KW - Galaxies: high-redshift
KW - Galaxies: photometry
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U2 - 10.1051/0004-6361/201730683
DO - 10.1051/0004-6361/201730683
M3 - Article
AN - SCOPUS:85030674733
VL - 606
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
SN - 0004-6361
M1 - A23
ER -