Discovery of a z=6.17 galaxy from CFHT and VLT observations

被引：49

作者：

Cuby, JG

Le Fèvre, O

McCracken, H

Cuillandre, JC

Magnier, E

Meneux, B

机构：

[1] European So Observ, Santiago 19, Chile

[2] Lab Astrophys Marseille, Marseille, France

[3] Osservatorio Astron Bologna, Bologna, Italy

[4] Canada France Hawaii Telescope Corp, Kamuela, HI 96743 USA

来源：

ASTRONOMY & ASTROPHYSICS | 2003年 / 405卷 / 02期

关键词：

galaxies : high-redshift; early Universe; techniques : spectroscopic;

D O I：

10.1051/0004-6361:20030760

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the discovery of a galaxy at a redshift z = 6.17 identified from deep narrow band imaging and spectroscopic follow-up in one of the CFHT-VIRMOS deep survey fields at 0226-04. In addition to the existing deep BVRI images of this field, we obtained a very deep narrow band image at 920 nm with the aim of detecting Lyalpha emission at redshift similar to6.5. Spectroscopic follow-up of some of the candidates selected on the basis of their excess flux in the NB920 filter was performed at the VLT-UT4 with the FORS2 instrument. For one object a strong and asymmetric emission line associated with a strong break in continuum emission is identified as Lyalpha at z = 6.17. This galaxy was selected from its continuum emission in the 920 nm filter and not from its Lyalpha emission, in effect performing a Lyman Break detection at z = 6.17. We estimate a star formation rate of several tens of M. yr(-1) for this object, with a velocity dispersion similar to400 km s(-1). The spectroscopic follow-up of other high z galaxy candidates is on-going.

引用

页码：L19 / L22

页数：4

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