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arXiv 2410.08387astro-ph.GA
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RUBIES:JWST/NIRSpec解析$z\sim2$处尘埃星系形成星系的演化阶段

RUBIES: JWST/NIRSpec resolves evolutionary phases of dusty star-forming galaxies at $z\sim2$

Olivia R. Cooper, Gabriel Brammer, Kasper E. Heintz, Sune Toft, Caitlin M. Casey, David J. Setton, Anna de Graaff, Leindert Boogaard, Nikko J. Cleri, Steven Gil… 展开作者

Olivia R. Cooper, Gabriel Brammer, Kasper E. Heintz, Sune Toft, Caitlin M. Casey, David J. Setton, Anna de Graaff, Leindert Boogaard, Nikko J. Cleri, Steven Gillman, Rashmi Gottumukkala, Jenny E. Greene, Bitten Gullberg, Michaela Hirschmann, Raphael E. Hviding, Erini Lambrides, Joel Leja, Arianna S. Long, Sinclaire M. Manning, Michael V. Maseda, Ian McConachie, Jed McKinney, Desika Narayanan, Sedona H. Price, Victoria Strait, Andrea Weibel, Christina C. Williams

AI总结:

基于RUBIES的JWST/NIRSpec观测,研究了$z\sim2.3-2.7$的四个ALMA探测到的尘埃星系形成星系,发现其光谱揭示出异质的恒星形成特性与演化阶段,并利用多条谱线推导了其光学衰减曲线。

摘要:

尘埃星系形成星系(DSFGs)是宇宙活动高峰期尘埃与恒星质量组装的主要驱动力,其高质量光谱的缺乏极大阻碍了我们理解其物理过程与演化路径。我们展示了来自RUBIES的JWST/NIRSpec观测,研究对象为宇宙正午时期($z\sim2.3-2.7$)四个亚毫米波选择、ALMA探测到的DSFGs。尽管测光一致表明整个样本均具有符合典型DSFGs的剧烈正在进行恒星形成,但光谱存在差异:一个源具有演化恒星族的光谱证据,表明近期过渡到星暴后阶段,而其余源显示出正在进行星暴的强光谱特征。这四个星系均具有高红外光度(log$_{10}$$L_{\rm{IR}}$/L$_{\rm \odot}$ $>12.4$)、大质量(log$_{10}\\,M_\star$/M$_{\rm{\odot}}$ $>11$)和高尘埃遮蔽($A_V\sim3-4$ ABmag)。利用多条Balmer和Paschen线探测,我们推导出的光学衰减曲线总体与Calzetti一致,但光学消光比$R_V\sim2.5$,可能表明存在更小的尘埃颗粒或星尘几何差异。该案例研究提供了首批详细的光谱证据之一,表明DSFGs包含跨越恒星形成特性与演化阶段的异质样本,并阐明了JWST和ALMA协同分析DSFGs的优势。

英文摘要:

The dearth of high quality spectroscopy of dusty star-forming galaxies (DSFGs) -- the main drivers of the assembly of dust and stellar mass at the peak of activity in the Universe -- greatly hinders our ability to interpret their physical processes and evolutionary pathways. We present JWST/NIRSpec observations from RUBIES of four submillimeter-selected, ALMA-detected DSFGs at cosmic noon, $z\sim2.3-2.7$. While photometry uniformly suggests vigorous ongoing star formation for the entire sample in line with canonical DSFGs, the spectra differ: one source has spectroscopic evidence of an evolved stellar population, indicating a recent transition to a post-starburst phase, while the remainder show strong spectroscopic signatures of ongoing starbursts. All four galaxies are infrared-luminous (log$_{10}$$L_{\rm{IR}}$/L$_{\rm \odot}$ $>12.4$), massive (log$_{10}\,M_\star$/M$_{\rm \odot}$ $>11$), and very dust-obscured ($A_V\sim3-4$ ABmag). Leveraging detections of multiple Balmer and Paschen lines, we derive an optical attenuation curve consistent with Calzetti overall, yet an optical extinction ratio $R_V\sim2.5$, potentially indicating smaller dust grains or differences in star-dust geometry. This case study provides some of the first detailed spectroscopic evidence that the DSFGs encompass a heterogeneous sample spanning a range of star formation properties and evolutionary stages, and illustrates the advantages of synergistic JWST and ALMA analysis of DSFGs.

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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