Report
The puzzling properties of the MACS1149-JD1 galaxy at z=9.11
| العنوان: | The puzzling properties of the MACS1149-JD1 galaxy at z=9.11 |
|---|---|
| المؤلفون: | Stiavelli, Massimo, Morishita, Takahiro, Chiaberge, Marco, Grillo, Claudio, Leethochawalit, Nicha, Rosati, Piero, Schuldt, Stefan, Trenti, Michele, Treu, Tommaso |
| سنة النشر: | 2023 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Astrophysics of Galaxies |
| الوصف: | We analyze new JWST NIRCam and NIRSpec data on the redshift 9.11 galaxy MACS1149-JD1. Our NIRCam imaging data reveal that JD1 comprises three spatially distinct components. Our spectroscopic data indicate that JD1 appears dust-free but is already enriched, $12 + \log {\rm (O/H) } = 7.90^{+0.04}_{-0.05}$. We also find that the Carbon and Neon abundances in JD1 are below the solar abundance ratio. Particularly the Carbon under-abundance is suggestive of recent star formation where Type~II supernovae have already enriched the ISM in Oxygen but intermediate mass stars have not yet enriched the ISM in Carbon. A recent burst of star formation is also revealed by the star formation history derived from NIRCam photometry. Our data do not reveal the presence of a significant amount of old populations, resulting in a factor of $\sim7\times$ smaller stellar mass than previous estimates. Thus, our data support the view that JD1 is a young galaxy. Comment: Accepted for publication |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2308.14696 |
| رقم الانضمام: | edsarx.2308.14696 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |