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arXiv 2410.03366astro-ph.GA
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JWST/NIRCam Pa$\mathrmβ$ 窄带成像揭示 z=2.16 蜘蛛网原星系团中 H$\mathrmα$ 发射线星系的普通尘埃消光

JWST/NIRCam Pa$\mathrmβ$ narrow-band imaging reveals ordinary dust extinction for H$\mathrmα$ emitters within the Spiderweb protocluster at z=2.16

Jose Manuel Pérez-Martínez, Helmut Dannerbauer, Yusei Koyama, Pablo G. Pérez-González, Rhythm Shimakawa, Tadayuki Kodama, Yuheng Zhang, Kazuki Daikuhara, Chiara… 展开作者

Jose Manuel Pérez-Martínez, Helmut Dannerbauer, Yusei Koyama, Pablo G. Pérez-González, Rhythm Shimakawa, Tadayuki Kodama, Yuheng Zhang, Kazuki Daikuhara, Chiara D'Eugenio, Abdurrahman Naufal

AI总结:

利用JWST与Subaru双窄带成像测量蜘蛛网原星系团43个Hα星系的Paβ/Hα,发现其尘埃消光和恒星形成率与同期场星系相当,且不依赖环境,支持尘埃由长期恒星形成和平稳气体吸积主导。

摘要:

我们结合 JWST/NIRCam 与 Subaru/MOIRCS 的双 Pa$\mathrmβ$ + H$\mathrmα$ 窄带成像,追踪位于宇宙正午时期质量最大、研究最充分的形成中星系团之一——蜘蛛网原星系团($\mathrm{z=2.16}$)核心区域 43 个 H$\mathrmα$ 发射线星系的尘埃衰减与恒星形成活动。我们发现大多数 H$\mathrmα$ 发射线星系的 Pa$\mathrmβ$/H$\mathrmα$ 比值与 Case B 复合条件相符,对应的星云消光值范围为 $\mathrm{A_V\approx0-3}$ 星等,经尘埃校正后的 $\mathrm{Paβ}$ 恒星形成率与同一宇宙时期固定恒星质量($\mathrm{9.4<\log M_*/M_\odot<11.0}$)下的同期主序场星系一致。此外,我们研究了原星系团大尺度结构中尘埃消光可能受到的环境影响,发现成员星系的尘埃含量与环境指标(如相空间位置、团中心半径或局部密度)之间没有相关性。这些结果支持以下图景:该原星系团主要星系群中的尘埃产生由长期恒星形成活动驱动,其燃料来自大尺度结构上的平稳气体吸积。这降低了引力相互作用在蜘蛛网原星系团内促进恒星形成和尘埃产生中的作用,与在更高红移、演化程度较低的原星系团核心中的观测结果形成对比。

英文摘要:

We combine JWST/NIRCam and Subaru/MOIRCS dual Pa$\mathrmβ$ + H$\mathrmα$ narrow-band imaging to trace the dust attenuation and the star-formation activities of a sample of 43 H$\mathrmα$ emitters at the core of one of the most massive and best-studied clusters in formation at the cosmic noon: the Spiderweb protocluster at $\mathrm{z=2.16}$. We find that most H$\mathrmα$ emitters display Pa$\mathrmβ$/H$\mathrmα$ ratios compatible with Case B recombination conditions, which translates into nebular extinction values ranging at $\mathrm{A_V\approx0-3}$ magnitudes, and dust corrected $\mathrm{Paβ}$ star formation rates consistent with coeval main sequence field galaxies at fixed stellar mass ($\mathrm{9.4<\log M_*/M_\odot<11.0}$) during this cosmic epoch. Furthermore, we investigate possible environmental impacts on dust extinction across the protocluster large-scale structure and find no correlation between the dustiness of its members and environmental proxies such as phase-space position, clustercentric radius, or local density. These results support the scenario for which dust production within the main galaxy population of this protocluster is driven by secular star formation activities fueled by smooth gas accretion across its large-scale structure. This downplays the role of gravitational interactions in boosting star formation and dust production within the Spiderweb protocluster, in contrast with observations in higher redshift and less evolved protocluster cores.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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