Статья

The Discovery of a Luminous [CLC][ITAL]z[/ITAL][/CLC] = 5.80 Quasar from the Sloan Digital Sky Survey

Xiaohui FanPrinceton University Observatory, Princeton, NJ 08544R. L. WhiteSpace Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218Marc DavisDepartment of Astronomy, University of California, Berkeley, CA 94720-3411R. H. BeckerDepartment of Physics, University of California, Davis, CA 95616Michael A. StraussPrinceton University Observatory, Princeton, NJ 08544Zoltán HaimanPrinceton University Observatory, Princeton, NJ 08544Donald P. SchneiderDepartment of Astronomy and Astrophysics, Pennsylvania State University, University Park, PA 16802Michael D. GreggDepartment of Physics, University of California, Davis, CA 95616James E. GunnPrinceton University Observatory, Princeton, NJ 08544G. R. KnappPrinceton University Observatory, Princeton, NJ 08544Robert H. LuptonPrinceton University Observatory, Princeton, NJ 08544John E. AndersonFermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510Scott F. AndersonDepartment of Astronomy, University of Washington, Box 351580, Seattle, WA 98195James AnnisFermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510Neta A. BahcallPrinceton University Observatory, Princeton, NJ 08544William N. BoroskiFermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510Róbert BrunnerDepartment of Astronomy, California Institute of Technology, Pasadena, CA 91125Bing ChenDepartment of Physics and Astronomy, Johns Hopkins University, 3701 San Martin Drive, Baltimore, MD 21218Andrew J. ConnollyDepartment of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260István CsabaiDepartment of Physics and Astronomy, Johns Hopkins University, 3701 San Martin Drive, Baltimore, MD 21218Mamoru DoiDepartment of Astronomy and Research Center for the Early Universe, School of Science, University of Tokyo, Hongo, Bunkyo, Tokyo, 113-0033, JapanM. FukugitaInstitute for Advanced Study, Olden Lane, Princeton, NJ 08540G. S. HennessyUS Naval Observatory, 3450 Massachusetts Avenue Northwest, Washington, DC 20392-5420Robert B. HindsleyRemote Sensing Division, Code 7215, Naval Research Laboratory, 4555 Overlook Avenue Southwest, Washington, DC 20375Takashi IchikawaAstronomical Institute, Tohoku University, Aoba, Sendai 980-8578 JapanŽeljko IvezićPrinceton University Observatory, Princeton, NJ 08544J. LovedayAstronomy Centre, University of Sussex, Falmer, Brighton BN1 9QJ, UKAvery MeiksinInstitute for Astronomy, University of Edinburgh, Edinburgh EH9 3HJ, UKTimothy A. McKayDepartment of Physics, University of Michigan, 500 East University, Ann Arbor, MI 48109Jeffrey A. MunnUS Naval Observatory, Flagstaff Station, P.O. Box 1149, Flagstaff, AZ 86002-1149Heidi Jo NewbergDepartment of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy, NY 12180Robert C. NicholDepartment of Physics, Carnegie Mellon University, Pittsburgh, PA 15213Sadanori OkamuraDepartment of Astronomy and Research Center for the Early Universe, School of Science, University of Tokyo, Hongo, Bunkyo, Tokyo, 113-0033, JapanJeffrey R. PierUS Naval Observatory, Flagstaff Station, P.O. Box 1149, Flagstaff, AZ 86002-1149M. SekiguchiInstitute for Cosmic Ray Research, University of Tokyo, Midori, Tanashi, Tokyo 188-8502, JapanKazuhiro ShimasakuDepartment of Astronomy and Research Center for the Early Universe, School of Science, University of Tokyo, Hongo, Bunkyo, Tokyo, 113-0033, JapanChris StoughtonFermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510Alexander S. SzalayDepartment of Physics and Astronomy, Johns Hopkins University, 3701 San Martin Drive, Baltimore, MD 21218G. SzokolyAstrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, GermanyAniruddha R. ThakarDepartment of Physics and Astronomy, Johns Hopkins University, 3701 San Martin Drive, Baltimore, MD 21218Michael S. VogeleyDepartment of Physics, Drexel University, 3141 Chestnut Street, Philadelphia, PA 19104Donald G. YorkDepartment of Astronomy and Astrophysics, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637

2000en

ABI

Аннотация

We present observations of SDSSp J104433.04--012502.2, a luminous quasar at z=5.80 discovered from Sloan Digital Sky Survey (SDSS) multicolor imaging data. This object was selected as an i'-band dropout object, with i*=21.8 +/- 0.2, z*=19.2 +/- 0.1. It has an absolute magnitude M1450 = -27.2 (H_0 =50 km/s/Mpc, q0 = 0.5). The spectrum shows a strong and broad Ly alpha emission line, strong Ly alpha forest absorption lines with a mean continuum decrement D_A = 0.91, and a Lyman Limit System at z=5.72. The spectrum also shows strong OI and SiIV emission lines similar to those of quasars at z<= 5, suggesting that these metals were produced at redshift beyond six. The lack of a Gunn-Peterson trough in the spectrum indicates that the universe is already highly ionized at z ~ 5.8. Using a high-resolution spectrum in the Ly alpha forest region, we place a conservative upper limit of the optical depth due to the Gunn-Peterson effect of tau < 0.5 in regions of minimum absorption. The Ly alpha forest absorption in this object is much stronger than that in quasars at z<= 5. The object is unresolved in a deep image with excellent seeing, implying that it is unlensed. The black hole mass of this quasar is ~3 x 10^9 M_solar if we assume that it is radiating at the Eddington luminosity and no lensing amplification, implying that it resides in a very massive dark matter halo. The discovery of one quasar at M_1450 < -27 in a survey area of 600 deg^2 is consistent with an extrapolation of the observed luminosity function at lower redshift. The abundance and evolution of such quasars can provide sensitive tests of models of quasar and galaxy formation.

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Идентификаторы

DOI: 10.1086/301534

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Цитирований: 3Использованных источников: 0

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