A gravitationally boosted MUSE survey for emission-line galaxies at z ≳ 5 behind the massive cluster RCS 0224

被引：42

作者：

Smit, Renske ^{[1
,2
,3
]}

Swinbank, A. M. ^{[1
,4
]}

Massey, Richard ^{[1
,4
]}

Richard, Johan ^{[5
]}

Smail, Ian ^{[1
,4
]}

Kneib, J. -P. ^{[6
,7
]}

机构：

[1] Univ Durham, Ctr Extragalact Astron, South Rd, Durham DH1 3LE, England

[2] Univ Cambridge, Cavendish Lab, 19 JJ Thomson Ave, Cambridge CB3 0HE, England

[3] Univ Cambridge, Kavli Inst Cosmol, Madingley Rd, Cambridge CB3 0HA, England

[4] Univ Durham, Inst Computat Cosmol, South Rd, Durham DH1 3LE, England

[5] Univ Lyon1, Ens Lyon, CNRS, Ctr Rech Astrophys Lyon UMR5574, F-69230 St Genis Laval, France

[6] Ecole Polytech Fed Lausanne, Observ Sauverny, Inst Phys, Lab Astrophys, CH-1015 Versoix, Switzerland

[7] Aix Marseille Univ, CNRS, LAM, UMR 7326, F-13388 Marseille, France

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2017年 / 467卷 / 03期

关键词：

galaxies: evolution; galaxies: formation; galaxies: high-redshift; STAR-FORMING GALAXIES; LYMAN-BREAK GALAXIES; HUBBLE DEEP FIELD; ULTRAVIOLET LUMINOSITY DENSITY; HIGH-REDSHIFT GALAXIES; LY-ALPHA RADIATION; COSMIC REIONIZATION; PHYSICAL CONDITIONS; SPECTROSCOPIC CONFIRMATION; PHOTOMETRIC REDSHIFTS;

D O I：

10.1093/mnras/stx245

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a Very Large Telescope/Multi Unit Spectroscopic Explorer (MUSE) survey of lensed high-redshift galaxies behind the z = 0.77 cluster RCS 0224-0002. We study the detailed internal properties of a highly magnified (mu similar to 29) z = 4.88 galaxy seen through the cluster. We detect widespread nebular C IV lambda lambda 1548,1551 angstrom emission from this galaxy as well as a bright Ly alpha halo with a spatially uniform wind and absorption profile across 12 kpc in the image plane. Blueshifted high-and low-ionization interstellar absorption indicate the presence of a high-velocity outflow (Delta v similar to 300 km s(-1)) from the galaxy. Unlike similar observations of galaxies at z similar to 2 - 3, the Lya emission from the halo emerges close to the systemic velocity - an order of magnitude lower in velocity offset than predicted in 'shell'-like outflow models. To explain these observations, we favour a model of an outflow with a strong velocity gradient, which changes the effective column density seen by the Lya photons. We also search for high-redshift Ly alpha emitters and identify 14 candidates between z = 4.8 - 6.6, including an overdensity at z = 4.88, of which only one has a detected counterpart in Hubble Space Telescope/Advanced Camera for Surveys+Wide Field Camera 3 imaging.

引用

页码：3306 / 3323

页数：18

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