Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-03-30
Astron.Astrophys.405:L19,2003
Astronomy and Astrophysics
Astrophysics
4 pages, 3 figures, letter. Revised after referee comments. Accepted for publication in A&A
Scientific paper
10.1051/0004-6361:20030760
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 ~ 6.5. 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 rather than for 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 for this object, with a velocity dispersion 400 km/s. The spectroscopic follow-up of other high $z$ galaxy candidates is on-going.
Cuby Jean Gabriel
Cuillandre Jean Charles
Le Fèvre Oliver
Magnier Eugene
McCracken Henry
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