Chasing the beginning of reionization in the JWST era
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2024
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866918019355115520 |
|---|---|
| author | Cain, Christopher Lopez, Garett D'Aloisio, Anson Munoz, Julian B. Jansen, Rolf A. Windhorst, Rogier A. Gangolli, Nakul |
| author_facet | Cain, Christopher Lopez, Garett D'Aloisio, Anson Munoz, Julian B. Jansen, Rolf A. Windhorst, Rogier A. Gangolli, Nakul |
| contents | Recent JWST observations at $z > 6$ may imply galactic ionizing photon production above prior expectations. Under observationally motivated assumptions about escape fractions, these suggest a $z \sim 8-9$ end to reionization, in tension with the $z < 6$ end required by the Ly$α$ forest. In this work, we use radiative transfer simulations to understand what different observations tell us about when reionization ended and when it started. We consider a model that ends too early ($z_{\rm end} \approx 8$) alongside two more realistic scenarios with $z_{\rm end} \approx 5$: one starting late ($z \sim 9$) and another early ($z \sim 13$). We find that the latter requires up to an order-of-magnitude evolution in galaxy ionizing properties at $6 < z < 12$, perhaps in tension with measurements of $ξ_{\rm ion}$ by JWST, which indicate little evolution. We study how these models compare to recent measurements of the Ly$α$ forest opacity, mean free path, IGM thermal history, visibility of $z > 8$ Ly$α$ emitters, and the patchy kSZ signal from the CMB. We find that neither of the late-ending scenarios is strongly disfavored by any single data set. However, a majority of observables, spanning several distinct types of observations, prefer a late start. Not all probes agree with this conclusion, hinting at a possible lack of concordance arising from deficiencies in observations and/or theoretical modeling. Observations by multiple experiments (including JWST, Roman, and CMB-S4) in the coming years will establish a concordance picture of reionization's beginning or uncover such deficiencies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_02989 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Chasing the beginning of reionization in the JWST era Cain, Christopher Lopez, Garett D'Aloisio, Anson Munoz, Julian B. Jansen, Rolf A. Windhorst, Rogier A. Gangolli, Nakul Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies Recent JWST observations at $z > 6$ may imply galactic ionizing photon production above prior expectations. Under observationally motivated assumptions about escape fractions, these suggest a $z \sim 8-9$ end to reionization, in tension with the $z < 6$ end required by the Ly$α$ forest. In this work, we use radiative transfer simulations to understand what different observations tell us about when reionization ended and when it started. We consider a model that ends too early ($z_{\rm end} \approx 8$) alongside two more realistic scenarios with $z_{\rm end} \approx 5$: one starting late ($z \sim 9$) and another early ($z \sim 13$). We find that the latter requires up to an order-of-magnitude evolution in galaxy ionizing properties at $6 < z < 12$, perhaps in tension with measurements of $ξ_{\rm ion}$ by JWST, which indicate little evolution. We study how these models compare to recent measurements of the Ly$α$ forest opacity, mean free path, IGM thermal history, visibility of $z > 8$ Ly$α$ emitters, and the patchy kSZ signal from the CMB. We find that neither of the late-ending scenarios is strongly disfavored by any single data set. However, a majority of observables, spanning several distinct types of observations, prefer a late start. Not all probes agree with this conclusion, hinting at a possible lack of concordance arising from deficiencies in observations and/or theoretical modeling. Observations by multiple experiments (including JWST, Roman, and CMB-S4) in the coming years will establish a concordance picture of reionization's beginning or uncover such deficiencies. |
| title | Chasing the beginning of reionization in the JWST era |
| topic | Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2409.02989 |