We present a detailed study of an unusually bright, lensed galaxy at z=5.424 discoveredwithin theCFHTLSimaging survey.With an observed flux of iAB =23.0, J141446.82+544631.9 is one of the brightest galaxies known at z > 5. It is characterized by strong Ly α emission, reaching a peak in (observed) flux density of > 10-16 erg s-1 cm-2Å-1. A deep optical spectrum from the Large Binocular Telescope places strong constraints on NV and C IV emission, disfavouring an Active Galactic Nucleus (AGN) source for the emission. However, a detection of the NIV] λ 1486 emission line indicates a hard ionizing continuum, possibly from hot, massive stars. Resolved imaging from HST deblends the galaxy from a foreground interloper; these observations include narrowband imaging of the Ly α emission, which is marginally resolved on approximately fewkpc scales and has EW0 ~ 260 Å. The Ly α emission extends over ~ 2000 km s-1 and is broadly consistent with expanding shell models. Spectral energy distribution fitting that includes Spitzer/IRAC photometry suggests a complex star formation history that includes both a recent burst and an evolved population. J1414+5446 lies 30 arcsec from the centre of a known lensing cluster in the CFHTLS; combined with the foreground contribution, this leads to a highly uncertain estimate for the lensing magnification in the range 5 ≲ μ ≲ 25. Because of its unusual brightness, J1414+5446 affords unique opportunities for detailed study of an individual galaxy near the epoch of re-ionization and a preview of what can be expected from upcoming wide-area surveys that will yield hundreds of similar objects.
- (Cosmology:) dark ages, re-ionization, first stars
- Galaxies: ISM-galaxies: groups: individual: SL2S J141447+544703
- Galaxies: high-redshift
- Galaxies: individual: CFHTLS J141446.82+544631.9
- Gravitational lensing: strong.
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science