NEW OBSERVATIONS OF z ∼ 7 GALAXIES: EVIDENCE FOR A PATCHY REIONIZATION

被引：226

作者：

Pentericci, L. ^{[1
]}

Vanzella, E. ^{[2
]}

Fontana, A. ^{[1
]}

Castellano, M. ^{[1
]}

Treu, T. ^{[3
]}

Mesinger, A. ^{[4
]}

Dijkstra, M. ^{[5
]}

Grazian, A. ^{[1
]}

Bradac, M. ^{[6
]}

Conselice, C. ^{[7
]}

Cristiani, S. ^{[8
]}

Dunlop, J. ^{[9
]}

Galametz, A. ^{[1
]}

Giavalisco, M. ^{[10
]}

Giallongo, E. ^{[1
]}

Koekemoer, A. ^{[11
]}

McLure, R. ^{[9
]}

Maiolino, R. ^{[12
]}

Paris, D. ^{[1
]}

Santini, P. ^{[1
]}

机构：

[1] INAF Osservatorio Astron Roma, I-00040 Monte Porzio Catone, RM, Italy

[2] INAF Osservatorio Astron Bologna, Bologna, Italy

[3] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA

[4] Scuola Normale Super Pisa, I-56126 Pisa, Italy

[5] Max Planck Inst Astrophys, D-85741 Garching, Germany

[6] Univ Calif Davis, Dept Phys, Davis, CA 95616 USA

[7] Univ Nottingham, Sch Phys & Astron, Nottingham NG7 2RD, England

[8] INAF Osservatorio Astron Trieste, I-34131 Trieste, Italy

[9] Univ Edinburgh, Royal Observ, Inst Astron, Edinburgh EH9 3HJ, Midlothian, Scotland

[10] Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA

[11] Space Telescope Sci Inst, Baltimore, MD 21218 USA

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

来源：

ASTROPHYSICAL JOURNAL | 2014年 / 793卷 / 02期

基金：

欧洲研究理事会;

关键词：

galaxies: distances and redshifts; galaxies: formation; galaxies: high-redshift; LYMAN-BREAK GALAXIES; LY-ALPHA-EMITTERS; STAR-FORMING GALAXIES; COSMIC REIONIZATION; SPECTROSCOPIC CONFIRMATION; LUMINOSITY FUNCTION; KECK SPECTROSCOPY; PROBING REIONIZATION; IONIZING EMISSIVITY; EARLIEST GALAXIES;

D O I：

10.1088/0004-637X/793/2/113

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present new results from our search for z similar to 7 galaxies from deep spectroscopic observations of candidate z dropouts in the CANDELS fields. Despite the extremely low flux limits achieved by our sensitive observations, only two galaxies have robust redshift identifications, one from its Ly alpha emission line at z = 6.65, the other from its Lyman break, i.e., the continuum discontinuity at the Ly alpha wavelength consistent with a redshift of 6.42 but with no emission line. In addition, for 23 galaxies we present deep limits in the Ly alpha equivalent width derived from the nondetections in ultradeep observations. Using this new data as well as previous samples, we assemble a total of 68 candidate z similar to 7 galaxies with deep spectroscopic observations, of which 12 have a line detection. With this much enlarged sample we can place solid constraints on the declining fraction of Ly alpha emission in z similar to 7 Lyman-break galaxies compared to z similar to 6, both for bright and faint galaxies. Applying a simple analytical model, we show that the present data favor a patchy reionization process rather than a smooth one.

引用

页数：10

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