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http://hdl.handle.net/20.500.12386/26846
Title: | Primordial environment of supermassive black holes. II. Deep Y- and J-band images around the z~6.3 quasar SDSS J1030+0524 | Authors: | BALMAVERDE, Barbara GILLI, Roberto MIGNOLI, Marco BOLZONELLA, MICOL Brusa, M. Cappelluti, N. COMASTRI, Andrea Sani, E. VANZELLA, Eros Vignali, C. Vito, F. Zamorani, G. |
Issue Date: | 2017 | Journal: | ASTRONOMY & ASTROPHYSICS | Number: | 606 | First Page: | A23 | Abstract: | 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 ( 25' × 25') 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 z_AB< 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 <z_AB< 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 δ = 2.4, which is significant at >4σ. 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. | URI: | http://hdl.handle.net/20.500.12386/26846 | URL: | https://www.aanda.org/articles/aa/abs/2017/10/aa30683-17/aa30683-17.html | ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/201730683 | Bibcode ADS: | 2017A&A...606A..23B | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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aa30683-17_compressed.pdf | pdf editoriale | 3.26 MB | Adobe PDF | View/Open |
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