THE IDENTIFICATION OF z-DROPOUTS IN PAN-STARRS1: THREE QUASARS AT 6.5 < z < 6.7

被引：153

作者：

Venemans, B. P. ^{[1
]}

Banados, E. ^{[1
]}

Decarli, R. ^{[1
]}

Farina, E. P. ^{[1
]}

Walter, F. ^{[1
]}

Chambers, K. C. ^{[2
]}

Fan, X. ^{[3
]}

Rix, H-W. ^{[1
]}

Schlafly, E. ^{[1
]}

McMahon, R. G. ^{[4
,5
]}

Simcoe, R. ^{[6
]}

Stern, D. ^{[7
]}

Burgett, W. S. ^{[8
]}

Draper, P. W. ^{[9
]}

Flewelling, H. ^{[2
]}

Hodapp, K. W. ^{[2
]}

Kaiser, N. ^{[2
]}

Magnier, E. A. ^{[2
]}

Metcalfe, N. ^{[9
]}

Morgan, J. S. ^{[2
]}

Price, P. A. ^{[10
]}

Tonry, J. L. ^{[2
]}

Waters, C. ^{[2
]}

AlSayyad, Y. ^{[11
]}

Banerji, M. ^{[4
,5
]}

Chen, S. S. ^{[6
]}

Gonzalez-Solares, E. A. ^{[4
]}

Greiner, J. ^{[12
]}

Mazzucchelli, C. ^{[1
]}

McGreer, I. ^{[3
]}

Miller, D. R. ^{[6
]}

Reed, S. ^{[4
]}

Sullivan, P. W. ^{[6
]}

机构：

[1] Max Planck Inst Astron, D-69117 Heidelberg, Germany

[2] Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA

[3] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA

[4] Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England

[5] Univ Cambridge, Kavli Inst Cosmol, Cambridge CB3 0HA, England

[6] MIT, Kavli Ctr Astrophys & Space Res, Cambridge, MA 02139 USA

[7] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA

[8] GMTO Corp, Pasadena, CA 91101 USA

[9] Univ Durham, Dept Phys, Durham DH1 3LE, England

[10] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA

[11] Univ Washington, Dept Astron, Seattle, WA 98195 USA

[12] Max Planck Inst Extraterr Phys, D-85748 Garching, Germany

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2015年 / 801卷 / 01期

基金：

美国国家航空航天局; 美国国家科学基金会;

关键词：

cosmology: observations; galaxies: active; galaxies: individual (PSO J036.5078+03.0498; PSO J167.6415-13.4960; PSO J338.2298+29.5089); quasars: general; DIGITAL SKY SURVEY; Z-GREATER-THAN-5.7; QUASARS; STAR-FORMATION; HOST GALAXIES; BLACK-HOLES; REDSHIFT; DISCOVERY; MASS; SAMPLE; ZONES;

D O I：

10.1088/2041-8205/801/1/L11

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Luminous distant quasars are unique probes of the high-redshift intergalactic medium (IGM) and of the growth of massive galaxies and black holes in the early universe. Absorption due to neutral hydrogen in the IGM makes quasars beyond a redshift of z similar or equal to 6.5 very faint in the optical z band, thus locating quasars at higher redshifts requires large surveys that are sensitive above 1 micron. We report the discovery of three new z > 6.5 quasars, corresponding to an age of the universe of <850 Myr, selected as z-band dropouts in the Pan-STARRS1 survey. This increases the number of known z > 6.5 quasars from four to seven. The quasars have redshifts of z = 6.50, 6.52, and 6.66, and include the brightest z-dropout quasar reported to date, PSO J036.5078 + 03.0498 with M-1450 = -27.4. We obtained near-infrared spectroscopy for the quasars, and from the Mg II line, we estimate that the central black holes have masses between 5 x 10(8) and 4 x 10(9) M-circle dot and are accreting close to the Eddington limit (L-Bol/L-Edd = 0.13 - 1.2). We investigate the ionized regions around the quasars and find near-zone radii of R-NZ = 1.5 - 5.2 proper Mpc, confirming the trend of decreasing near-zone sizes with increasing redshift found for quasars at 5.7 < z < 6.4. By combining R-NZ of the PS1 quasars with those of 5.7 < z < 7.1 quasars in the literature, we derive a luminosity-corrected redshift evolution of R-NZ,R-corrected = (7.2 +/- 0.2) - (6.1 +/- 0.7) x (z - 6) Mpc. However, the large spread in R-NZ in the new quasars implies a wide range in quasar ages and/or a large variation in the neutral hydrogen fraction along different lines of sight.

引用

页数：7

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