JWST/NIRCam observations of stars and H ii regions in z ≃ 6–8 galaxies: properties of star-forming complexes on 150 pc scales
| العنوان: | JWST/NIRCam observations of stars and H |
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| المؤلفون: | Zuyi Chen, Daniel P Stark, Ryan Endsley, Michael Topping, Lily Whitler, Stéphane Charlot |
| المصدر: | Monthly Notices of the Royal Astronomical Society. 518:5607-5619 |
| بيانات النشر: | Oxford University Press (OUP), 2022. |
| سنة النشر: | 2022 |
| مصطلحات موضوعية: | Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics - Astrophysics of Galaxies |
| الوصف: | The onset of the {\it JWST}-era provides a much-improved opportunity to characterize the resolved structure of early star forming systems. Previous {\it Spitzer} observations of $z\gtrsim 6$ galaxies revealed the presence of old stars and luminous HII regions (via [OIII]+H$\beta$ emission), but the poor resolution stunted our ability to map their locations with respect to the star forming regions identified in the rest-UV. In this paper, we investigate the internal structure of 12 of the most luminous $z\simeq 6-8$ galaxies in the EGS field observed with recent {\it JWST}/NIRCam imaging. The systems appear clumpy in the rest-UV, with more than half of the light coming from $\simeq 10^7$ to 10$^{9}$ M$_\odot$ star forming complexes that are $\simeq 150$ - 480 pc in size. The clumps tend to be dominated by young stars (median = 36 Myr), but we also find large variations in clump ages within individual galaxies. The [OIII]+H$\beta$ EW varies significantly across individual galaxies (reflecting differences in stellar and gas properties), but the HII regions largely track the UV-bright complexes. Perhaps surprisingly, the rest-optical continuum is just as clumpy as the UV, and we do not find older (and redder) nuclear stellar components that were previously undetected or faint in the UV. The majority of the stellar mass in bright $6 Comment: main text 12 pages, 7 figures; accepted for publication by MNRAS |
| تدمد: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnras/stac3476 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::da55e324a6769ef5f6991d4fd8d4d858 https://doi.org/10.1093/mnras/stac3476 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....da55e324a6769ef5f6991d4fd8d4d858 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 13652966 00358711 |
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| DOI: | 10.1093/mnras/stac3476 |