%0 Generic %1 laporte2021probing %A Laporte, N. %A Meyer, R. A. %A Ellis, R. S. %A Robertson, B. E. %A Chisholm, J. %A Roberts-Borsani, G. W. %D 2021 %K library %T Probing Cosmic Dawn : Ages and Star Formation Histories of Candidate $z\geq$9 Galaxies %U http://arxiv.org/abs/2104.08168 %X We discuss the spectral energy distributions and physical properties of six galaxies whose photometric redshifts suggest they lie beyond a redshift $z\simeq$9. Each was selected on account of a prominent excess seen in the Spitzer/IRAC 4.5$\mu$m band which, for a redshift above $z=9.0$, likely indicates the presence of a rest-frame Balmer break and a stellar component that formed earlier than a redshift $z\simeq10$. In addition to constraining the earlier star formation activity on the basis of fits using stellar population models with BAGPIPES, we have undertaken the necessary, but challenging, follow-up spectroscopy for each candidate using various combinations of Keck/MOSFIRE, VLT/X-shooter, Gemini/FLAMINGOS2 and ALMA. Based on either Lyman-$\alpha$ or OIII 88 $\mu$m emission, we determine a convincing redshift of $z$=8.78 for GN-z-10-3 and a likely redshift of $z$=9.28 for the lensed galaxy MACS0416-JD. For GN-z9-1, we conclude the case remains promising for a source beyond $z\simeq$9. Together with earlier spectroscopic data for MACS1149-JD1, our analysis of this enlarged sample provides further support for a cosmic star formation history extending beyond redshifts $z\simeq$10. We use our best-fit stellar population models to reconstruct the past rest-frame UV luminosities of our sources and discuss the implications for tracing earlier progenitors of such systems with the James Webb Space Telescope.

@misc{laporte2021probing, abstract = {We discuss the spectral energy distributions and physical properties of six galaxies whose photometric redshifts suggest they lie beyond a redshift $z\simeq$9. Each was selected on account of a prominent excess seen in the Spitzer/IRAC 4.5$\mu$m band which, for a redshift above $z=9.0$, likely indicates the presence of a rest-frame Balmer break and a stellar component that formed earlier than a redshift $z\simeq10$. In addition to constraining the earlier star formation activity on the basis of fits using stellar population models with BAGPIPES, we have undertaken the necessary, but challenging, follow-up spectroscopy for each candidate using various combinations of Keck/MOSFIRE, VLT/X-shooter, Gemini/FLAMINGOS2 and ALMA. Based on either Lyman-$\alpha$ or [OIII] 88 $\mu$m emission, we determine a convincing redshift of $z$=8.78 for GN-z-10-3 and a likely redshift of $z$=9.28 for the lensed galaxy MACS0416-JD. For GN-z9-1, we conclude the case remains promising for a source beyond $z\simeq$9. Together with earlier spectroscopic data for MACS1149-JD1, our analysis of this enlarged sample provides further support for a cosmic star formation history extending beyond redshifts $z\simeq$10. We use our best-fit stellar population models to reconstruct the past rest-frame UV luminosities of our sources and discuss the implications for tracing earlier progenitors of such systems with the James Webb Space Telescope.}, added-at = {2021-04-19T14:19:53.000+0200}, author = {Laporte, N. and Meyer, R. A. and Ellis, R. S. and Robertson, B. E. and Chisholm, J. and Roberts-Borsani, G. W.}, biburl = {https://www.bibsonomy.org/bibtex/210f789e75da7f5b01116543d2509d53a/gpkulkarni}, description = {Probing Cosmic Dawn : Ages and Star Formation Histories of Candidate $z\geq$9 Galaxies}, interhash = {072316d0ad84137b134f2bdb0f61313b}, intrahash = {10f789e75da7f5b01116543d2509d53a}, keywords = {library}, note = {cite arxiv:2104.08168Comment: 12 pages, 12 figures, accepted for publication in MNRAS}, timestamp = {2021-04-19T14:19:53.000+0200}, title = {Probing Cosmic Dawn : Ages and Star Formation Histories of Candidate $z\geq$9 Galaxies}, url = {http://arxiv.org/abs/2104.08168}, year = 2021 }