MIDIS: Unveiling the Role of Strong Ha-emitters during the Epoch of Reionization with JWST
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2023
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| author | Rinaldi, P. Caputi, K. I. Iani, E. Costantin, L. Gillman, S. Perez-Gonzalez, P. G. Ostlin, G. Colina, L. Greve, T. R. Noorgard-Nielsen, H. U. Wright, G. S. Alvarez-Marquez, J. Eckart, A. Garcia-Marin, M. Hjorth, J. Ilbert, O. Kendrew, S. Labiano, A. Fevre, O. Le Pye, J. Tikkanen, T. Walter, F. van der Werf, P. Ward, M. Annunziatella, M. Azzollini, R. Bik, A. Boogaard, L. Bosman, S. E. I. Gomez, A. Crespo Jermann, I. Langeroodi, D. Melinder, J. Meyer, R. A. Moutard, T. Peissker, F. Gudel, M. Henning, Th. Lagage, P. -O. Ray, T. Vandenbussche, B. Waelkens, C. Dayal, P. |
| author_facet | Rinaldi, P. Caputi, K. I. Iani, E. Costantin, L. Gillman, S. Perez-Gonzalez, P. G. Ostlin, G. Colina, L. Greve, T. R. Noorgard-Nielsen, H. U. Wright, G. S. Alvarez-Marquez, J. Eckart, A. Garcia-Marin, M. Hjorth, J. Ilbert, O. Kendrew, S. Labiano, A. Fevre, O. Le Pye, J. Tikkanen, T. Walter, F. van der Werf, P. Ward, M. Annunziatella, M. Azzollini, R. Bik, A. Boogaard, L. Bosman, S. E. I. Gomez, A. Crespo Jermann, I. Langeroodi, D. Melinder, J. Meyer, R. A. Moutard, T. Peissker, F. Gudel, M. Henning, Th. Lagage, P. -O. Ray, T. Vandenbussche, B. Waelkens, C. Dayal, P. |
| contents | By using the ultra-deep \textit{JWST}/MIRI image at 5.6 $μm$ in the Hubble eXtreme Deep Field, we constrain the role of strong H$α$-emitters (HAEs) during Cosmic Reionization at $z\simeq7-8$. Our sample of HAEs is comprised of young ($<35\;\rm Myr$) galaxies, except for one single galaxy ($\approx 300\;\rm Myr$), with low stellar masses ($\lesssim 10^{9}\;\rm M_{\odot}$). These HAEs show a wide range of UV-$β$ slopes, with a median value of $β= -2.15\pm0.21$ which broadly correlates with stellar mass. We estimate the ionizing photon production efficiency ($ξ_{ion,0}$) of these sources (assuming $f_{esc,LyC} = 0\%$), which yields a median value $\rm log_{10}(ξ_{ion,0}/(Hz\;erg^{-1})) = 25.50^{+0.10}_{-0.12}$. We show that $ξ_{ion,0}$ positively correlates with EW$_{0}$(H$α$) and specific star formation rate (sSFR). Instead $ξ_{ion,0}$ weakly anti-correlates with stellar mass and $β$. Based on the $β$ values, we predict $f_{esc, LyC}=4\%^{+3}_{-2}$, which results in $\rm log_{10}(ξ_{ion}/(Hz\;erg^{-1})) = 25.55^{+0.11}_{-0.13}$. Considering this and related findings from the literature, we find a mild evolution of $ξ_{ion}$with redshift. Additionally, our results suggest that these HAEs require only modest escape fractions ($f_{esc, rel}$) of 6$-$15\% to reionize their surrounding intergalactic medium. By only considering the contribution of these HAEs, we estimated their total ionizing emissivity ($\dot{N}_{ion}$) as $\dot{N}_{ion} = 10^{50.53 \pm 0.45}; \text{s}^{-1}\text{Mpc}^{-3}$. When comparing their $\dot{N}_{ion}$ with "non-H$α$ emitter" galaxies across the same redshift range, we find that that strong, young, and low-mass emitters may have played an important role during Cosmic Reionization. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2309_15671 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | MIDIS: Unveiling the Role of Strong Ha-emitters during the Epoch of Reionization with JWST Rinaldi, P. Caputi, K. I. Iani, E. Costantin, L. Gillman, S. Perez-Gonzalez, P. G. Ostlin, G. Colina, L. Greve, T. R. Noorgard-Nielsen, H. U. Wright, G. S. Alvarez-Marquez, J. Eckart, A. Garcia-Marin, M. Hjorth, J. Ilbert, O. Kendrew, S. Labiano, A. Fevre, O. Le Pye, J. Tikkanen, T. Walter, F. van der Werf, P. Ward, M. Annunziatella, M. Azzollini, R. Bik, A. Boogaard, L. Bosman, S. E. I. Gomez, A. Crespo Jermann, I. Langeroodi, D. Melinder, J. Meyer, R. A. Moutard, T. Peissker, F. Gudel, M. Henning, Th. Lagage, P. -O. Ray, T. Vandenbussche, B. Waelkens, C. Dayal, P. Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics By using the ultra-deep \textit{JWST}/MIRI image at 5.6 $μm$ in the Hubble eXtreme Deep Field, we constrain the role of strong H$α$-emitters (HAEs) during Cosmic Reionization at $z\simeq7-8$. Our sample of HAEs is comprised of young ($<35\;\rm Myr$) galaxies, except for one single galaxy ($\approx 300\;\rm Myr$), with low stellar masses ($\lesssim 10^{9}\;\rm M_{\odot}$). These HAEs show a wide range of UV-$β$ slopes, with a median value of $β= -2.15\pm0.21$ which broadly correlates with stellar mass. We estimate the ionizing photon production efficiency ($ξ_{ion,0}$) of these sources (assuming $f_{esc,LyC} = 0\%$), which yields a median value $\rm log_{10}(ξ_{ion,0}/(Hz\;erg^{-1})) = 25.50^{+0.10}_{-0.12}$. We show that $ξ_{ion,0}$ positively correlates with EW$_{0}$(H$α$) and specific star formation rate (sSFR). Instead $ξ_{ion,0}$ weakly anti-correlates with stellar mass and $β$. Based on the $β$ values, we predict $f_{esc, LyC}=4\%^{+3}_{-2}$, which results in $\rm log_{10}(ξ_{ion}/(Hz\;erg^{-1})) = 25.55^{+0.11}_{-0.13}$. Considering this and related findings from the literature, we find a mild evolution of $ξ_{ion}$with redshift. Additionally, our results suggest that these HAEs require only modest escape fractions ($f_{esc, rel}$) of 6$-$15\% to reionize their surrounding intergalactic medium. By only considering the contribution of these HAEs, we estimated their total ionizing emissivity ($\dot{N}_{ion}$) as $\dot{N}_{ion} = 10^{50.53 \pm 0.45}; \text{s}^{-1}\text{Mpc}^{-3}$. When comparing their $\dot{N}_{ion}$ with "non-H$α$ emitter" galaxies across the same redshift range, we find that that strong, young, and low-mass emitters may have played an important role during Cosmic Reionization. |
| title | MIDIS: Unveiling the Role of Strong Ha-emitters during the Epoch of Reionization with JWST |
| topic | Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2309.15671 |