| Autor: |
Intae Jung, Steven L. Finkelstein, Pablo Arrabal Haro, Mark Dickinson, Henry C. Ferguson, Taylor A. Hutchison, Jeyhan S. Kartaltepe, Rebecca L. Larson, Raymond C. Simons, Casey Papovich, Hyunbae Park, Laura Pentericci, Jonathan R. Trump, Ricardo O. Amorín, Bren E. Backhaus, Micaela B. Bagley, Caitlin M. Casey, Yingjie Cheng, Nikko J. Cleri, M. C. Cooper, Olivia R. Cooper, Jonathan P. Gardner, Eric Gawiser, Andrea Grazian, Nimish P. Hathi, Michaela Hirschmann, Anton M. Koekemoer, Ray A. Lucas, Bahram Mobasher, Nor Pirzkal, Swara Ravindranath, Amber N. Straughn, L. Y. Aaron Yung, Alexander de la Vega |
| Jazyk: |
angličtina |
| Rok vydání: |
2024 |
| Předmět: |
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| Zdroj: |
The Astrophysical Journal, Vol 967, Iss 1, p 73 (2024) |
| Druh dokumentu: |
article |
| ISSN: |
1538-4357 |
| DOI: |
10.3847/1538-4357/ad3913 |
| Popis: |
We analyze rest-frame ultraviolet to optical spectra of three z ≃ 7.47–7.75 galaxies whose Ly α emission lines were previously detected with Keck/MOSFIRE observations, using the JWST/NIRSpec observations from the Cosmic Evolution Early Release Science survey. From NIRSpec data, we confirm the systemic redshifts of these Ly α emitters, and emission-line ratio diagnostics indicate these galaxies were highly ionized and metal-poor. We investigate Ly α line properties, including the line flux, velocity offset, and spatial extent. For the one galaxy where we have both NIRSpec and MOSFIRE measurements, we find a significant offset in their flux measurements (∼1.3–5× greater in MOSFIRE) and a marginal difference in the velocity shifts. The simplest interpretation is that the Ly α emission is extended and not entirely encompassed by the NIRSpec slit. The cross-dispersion profiles in NIRSpec reveal that Ly α in one galaxy is significantly more extended than the nonresonant emission lines. We also compute the expected sizes of ionized bubbles that can be generated by the Ly α sources and discuss viable scenarios for the creation of sizable ionized bubbles (>1 physical Mpc). The source with the highest-ionization condition is possibly capable of ionizing its own bubble, while the other two do not appear to be capable of ionizing such a large region, but require additional sources of ionizing photons. Therefore, the fact that we detect Ly α from these galaxies suggests diverse scenarios for the escape of Ly α during the epoch of reionization. High-spectral-resolution spectra with JWST/NIRSpec will be extremely useful for constraining the physics of patchy reionization. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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