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Title:
An Overdensity of Galaxies near the Most Distant Radio-loud Quasar
Authors:
Zheng, W.; Overzier, R. A.; Bouwens, R. J.; White, R. L.; Ford, H. C.; Benítez, N.; Blakeslee, J. P.; Bradley, L. D.; Jee, M. J.; Martel, A. R.; Mei, S.; Zirm, A. W.; Illingworth, G. D.; Clampin, M.; Hartig, G. F.; Ardila, D. R.; Bartko, F.; Broadhurst, T. J.; Brown, R. A.; Burrows, C. J.; Cheng, E. S.; Cross, N. J. G.; Demarco, R.; Feldman, P. D.; Franx, M.; Golimowski, D. A.; Goto, T.; Gronwall, C.; Holden, B.; Homeier, N.; Infante, L.; Kimble, R. A.; Krist, J. E.; Lesser, M. P.; Menanteau, F.; Meurer, G. R.; Miley, G. K.; Motta, V.; Postman, M.; Rosati, P.; Sirianni, M.; Sparks, W. B.; Tran, H. D.; Tsvetanov, Z. I.
Affiliation:
AA(Department of Physics and Astronomy, The Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218.), AB(Leiden Observatory, Postbus 9513, 2300 RA Leiden, Netherlands.), AC(UCO/Lick Observatory, University of California, Santa Cruz, CA 95064.), AD(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218.), AE(Department of Physics and Astronomy, The Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218.), AF(Instituto Astrofísica de Andalucía (CSIC), Camino Bajo de Huétor, 24, Granada 18008, Spain.), AG(Department of Physics and Astronomy, The Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218.), AH(Department of Physics and Astronomy, The Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218.), AI(Department of Physics and Astronomy, The Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218.), AJ(Department of Physics and Astronomy, The Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218.), AK(Department of Physics and Astronomy, The Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218.), AL(Leiden Observatory, Postbus 9513, 2300 RA Leiden, Netherlands.), AM(UCO/Lick Observatory, University of California, Santa Cruz, CA 95064.), AN(NASA Goddard Space Flight Center, Code 681, Greenbelt, MD 20771.), AO(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218.), AP(Spitzer Science Center, IPAC, MS 220-6, California Institute of Technology, Pasadena, CA 91125.), AQ(Bartko Science and Technology, 14520 Akron Street, Brighton, CO 80602.), AR(Racah Institute of Physics, The Hebrew University, Jerusalem 91904, Israel.), AS(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218.), AT(Metajiva, 12320 Scenic Drive, Edmonds, WA 98026.), AU(Conceptual Analytics, LLC, 8209 Woburn Abbey Road, Glenn Dale, MD 20769.), AV(Royal Observatory Edinburgh, Blackford Hill, Edinburgh, EH9 3HJ, UK.), AW(Department of Physics and Astronomy, The Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218.), AX(Department of Physics and Astronomy, The Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218.), AY(Leiden Observatory, Postbus 9513, 2300 RA Leiden, Netherlands.), AZ(Department of Physics and Astronomy, The Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218.), BA(Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan.), BB(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Lab, University Park, PA 16802.), BC(UCO/Lick Observatory, University of California, Santa Cruz, CA 95064.), BD(Department of Physics and Astronomy, The Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218.), BE(Departmento de Astronomía y Astrofísica, Pontificia Universidad Católica de Chile, Casilla 306, Santiago 22, Chile.), BF(Instituto Astrofísica de Andalucía (CSIC), Camino Bajo de Huétor, 24, Granada 18008, Spain.), BG(Jet Propulsion Laboratory, M/S 183-900, 4800 Oak Grove Drive, Pasadena, CA 91109.), BH(Steward Observatory, University of Arizona, Tucson, AZ 85721.), BI(Department of Physics and Astronomy, The Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218.), BJ(Department of Physics and Astronomy, The Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218.), BK(Leiden Observatory, Postbus 9513, 2300 RA Leiden, Netherlands.), BL(Department of Physics and Astronomy, The Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218.; Departmento de Astronomía y Astrofísica, Pontificia Universidad Católica de Chile, Casilla 306, Santiago 22, Chile.), BM(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218.), BN(European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching, Germany.), BO(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218.), BP(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218.), BQ(W. M. Keck Observatory, 65-1120 Mamalahoa Highway, Kamuela, HI 96743.), BR(Department of Physics and Astronomy, The Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218.)
Publication:
The Astrophysical Journal, Volume 640, Issue 2, pp. 574-578. (ApJ Homepage)
Publication Date:
04/2006
Origin:
UCP
ApJ Keywords:
Galaxies: High-Redshift, Cosmology: Large-Scale Structure of Universe, quasars: individual (SDSS J0836+0054)
DOI:
10.1086/500167
Bibliographic Code:
2006ApJ...640..574Z

Abstract

A 5 arcmin2 region around the luminous radio-loud quasar SDSS J0836+0054 (z=5.8) hosts a wealth of associated galaxies, characterized by very red (1.3<i775-z850<2.0) color. The surface density of these z~5.8 candidates is approximately 6 times higher than the number expected from deep ACS fields. This is one of the highest galaxy overdensities at high redshifts, which may develop into a group or cluster. We also find evidence for a substructure associated with one of the candidates. It has two very faint companion objects within 2", which are likely to merge. The finding supports the results of a recent simulation, which finds that luminous quasars at high redshifts lie on the most prominent dark matter filaments and are surrounded by many fainter galaxies. The quasar activity from these regions may signal the buildup of a massive system.

Based on observations with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities of Research in Astronomy, Inc., under NASA contract NAS5-26555.


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