Tracing Outflows from Stellar Feedback in the Early Universe with Lyman-$α$
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866916459204050944 |
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| author | Nianias, James Lim, Jeremy Wong, Yik Lok Wong, Gordon Kaur, Ishika Chen, Wenjun |
| author_facet | Nianias, James Lim, Jeremy Wong, Yik Lok Wong, Gordon Kaur, Ishika Chen, Wenjun |
| contents | Blind spectroscopy of massive lensing galaxy clusters with MUSE has revealed large numbers of gravitationally-lensed Lyman-$ α$ emitters exhibiting asymmetric profiles at $ 2.9 \leq z \leq 6.7 $, suggesting abundant outflows from low-mass star-forming galaxies in the early universe. Are these primaeval galaxies experiencing their first bursts of star formation, or established galaxies experiencing rejuvenation? With JWST rest-frame optical/NIR continuum imaging now available for many of these objects, we can search for older stellar populations. Here, we search for spectroscopic confirmation of outflows from these galaxies, finding a few high-signal-to-noise cases in which blueshifted interstellar absorption lines are detected. Next, we analyse the star formation histories with combined HST + JWST photometry. We find most them to be well characterised by very young, low metallicity stellar populations. However, despite the rest-frame optical/NIR coverage of JWST, we cannot place strict upper bounds on the mass in old stars (age $ > 100\,\text{Myr} $). |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2410_21788 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Tracing Outflows from Stellar Feedback in the Early Universe with Lyman-$α$ Nianias, James Lim, Jeremy Wong, Yik Lok Wong, Gordon Kaur, Ishika Chen, Wenjun Astrophysics of Galaxies Blind spectroscopy of massive lensing galaxy clusters with MUSE has revealed large numbers of gravitationally-lensed Lyman-$ α$ emitters exhibiting asymmetric profiles at $ 2.9 \leq z \leq 6.7 $, suggesting abundant outflows from low-mass star-forming galaxies in the early universe. Are these primaeval galaxies experiencing their first bursts of star formation, or established galaxies experiencing rejuvenation? With JWST rest-frame optical/NIR continuum imaging now available for many of these objects, we can search for older stellar populations. Here, we search for spectroscopic confirmation of outflows from these galaxies, finding a few high-signal-to-noise cases in which blueshifted interstellar absorption lines are detected. Next, we analyse the star formation histories with combined HST + JWST photometry. We find most them to be well characterised by very young, low metallicity stellar populations. However, despite the rest-frame optical/NIR coverage of JWST, we cannot place strict upper bounds on the mass in old stars (age $ > 100\,\text{Myr} $). |
| title | Tracing Outflows from Stellar Feedback in the Early Universe with Lyman-$α$ |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2410.21788 |