%0 Generic %1 mcgreer2017bright %A McGreer, Ian D. %A Clément, Benjamin %A Mainali, Ramesh %A Stark, Daniel P. %A Gronke, Max %A Dijkstra, Mark %A Fan, Xiaohui %A Bian, Fuyan %A Frye, Brenda %A Jiang, Linhua %A Kneib, Jean-Paul %A Limousin, Marceau %A Walth, Gregory %D 2017 %K Lya emitter high-z lense %T A bright lensed galaxy at $z=5.4$ with strong Ly$\alpha$ emission %U http://arxiv.org/abs/1706.09428 %X We present a detailed study of a unusually bright galaxy at $z=5.424$ discovered within the CFHTLS imaging survey. With an observed flux of $i_\rm AB=23.0$, J141446.82+544631.9 is one of the brightest galaxies known at $z>5$. It is also one of the strongest Ly$\alpha$-emitting galaxies known, with an observed flux of $f_Ly\alpha 10^-15~erg~\rm s^-1~cm^-2$. A deep optical spectrum from the LBT places strong constraints on NV and CIV emission, disfavoring an AGN source for the emission. However, a detection of the NIV~$łambda$1486 emission line indicates a hard ionizing continuum, possibly from hot, massive stars. Resolved imaging from HST deblends the galaxy from a foreground interloper; these observations include narrowband imaging of the Ly$\alpha$ emission, which is marginally resolved on $\sim4$ kpc scales and has EW$_0~\sim$ 260\AA. The Ly$\alpha$ emission extends over $>1000~km~s^-1$ and is broadly consistent with expanding shell models. SED fitting that includes Spitzer/IRAC photometry suggests a complex star formation history that include both a recent burst and an evolved population. J1414+5446 lies 30" from the center 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 $5 łeq 25$. Because of its unusual brightness J1414+5446 affords unique opportunities for detailed study of an individual galaxy near the epoch of reionization and a preview of what can be expected from upcoming wide-area surveys that will yield hundreds of similar objects.

@misc{mcgreer2017bright, abstract = {We present a detailed study of a unusually bright galaxy at $z=5.424$ discovered within the CFHTLS imaging survey. With an observed flux of $i_{\rm AB}=23.0$, J141446.82+544631.9 is one of the brightest galaxies known at $z>5$. It is also one of the strongest Ly$\alpha$-emitting galaxies known, with an observed flux of $f_{{\rm Ly}\alpha} \approx 10^{-15}~{{\rm erg}~{\rm s}^{-1}~{\rm cm}^{-2}}$. A deep optical spectrum from the LBT places strong constraints on NV and CIV emission, disfavoring an AGN source for the emission. However, a detection of the NIV]~$\lambda$1486 emission line indicates a hard ionizing continuum, possibly from hot, massive stars. Resolved imaging from HST deblends the galaxy from a foreground interloper; these observations include narrowband imaging of the Ly$\alpha$ emission, which is marginally resolved on $\sim4$ kpc scales and has EW$_0~\sim$ 260\AA. The Ly$\alpha$ emission extends over $>1000~{{\rm km}~{\rm s}^{-1}}$ and is broadly consistent with expanding shell models. SED fitting that includes Spitzer/IRAC photometry suggests a complex star formation history that include both a recent burst and an evolved population. J1414+5446 lies 30" from the center 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 $5 \leq \mu \leq 25$. Because of its unusual brightness J1414+5446 affords unique opportunities for detailed study of an individual galaxy near the epoch of reionization and a preview of what can be expected from upcoming wide-area surveys that will yield hundreds of similar objects.}, added-at = {2017-06-30T10:03:54.000+0200}, author = {McGreer, Ian D. and Clément, Benjamin and Mainali, Ramesh and Stark, Daniel P. and Gronke, Max and Dijkstra, Mark and Fan, Xiaohui and Bian, Fuyan and Frye, Brenda and Jiang, Linhua and Kneib, Jean-Paul and Limousin, Marceau and Walth, Gregory}, biburl = {https://www.bibsonomy.org/bibtex/2f10bb9fc5f2da59f5a64a070790d21f5/miki}, description = {[1706.09428] A bright lensed galaxy at $z=5.4$ with strong Ly$\alpha$ emission}, interhash = {de8d17a971067bdeed34c03aab6571fb}, intrahash = {f10bb9fc5f2da59f5a64a070790d21f5}, keywords = {Lya emitter high-z lense}, note = {cite arxiv:1706.09428Comment: 19 pages, 13 figures, submitted to MNRAS}, timestamp = {2017-06-30T10:03:54.000+0200}, title = {A bright lensed galaxy at $z=5.4$ with strong Ly$\alpha$ emission}, url = {http://arxiv.org/abs/1706.09428}, year = 2017 }