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arXiv 2306.02472astro-ph.GAastro-ph.CO
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恒星形成盘中的核心作为早期宇宙中星系由内向外生长的证据

A core in a star-forming disc as evidence of inside-out growth in the early Universe

William M. Baker, Sandro Tacchella, Benjamin D. Johnson, Erica Nelson, Katherine A. Suess, Francesco D'Eugenio, Mirko Curti, Anna de Graaff, Zhiyuan Ji, Roberto… 展开作者

William M. Baker, Sandro Tacchella, Benjamin D. Johnson, Erica Nelson, Katherine A. Suess, Francesco D'Eugenio, Mirko Curti, Anna de Graaff, Zhiyuan Ji, Roberto Maiolino, Brant Robertson, Jan Scholtz, Stacey Alberts, Santiago Arribas, Kristan Boyett, Andrew J. Bunker, Stefano Carniani, Stephane Charlot, Zuyi Chen, Jacopo Chevallard, Emma Curtis-Lake, A. Lola Danhaive, Christa DeCoursey, Eiichi Egami, Daniel J. Eisenstein, Ryan Endsley, Ryan Hausen, Jakob M. Helton, Nimisha Kumari, Tobias J. Looser, Michael V. Maseda, Dávid Puskás, Marcia Rieke, Lester Sandles, Fengwu Sun, Hannah Übler, Christina C. Williams, Christopher N. A. Willmer, Joris Witstok

AI总结:

本研究在宇宙诞生前7亿年发现了形态成熟的星系JADES-GS+53.18343-27.79097,其具备致密核心、恒星形成盘与团块三组分,中心密度接近现代大质量椭圆星系,首次在再电离时期证实了星系由内向外生长的模式。

摘要:

决定星系形态演化和结构多样性的物理过程是河外天体物理学中的关键未知问题。本文报道了形态成熟的星系JADES-GS+53.18343-27.79097的发现,该星系存在于宇宙诞生后的前7亿年内。这个恒星质量为4亿倍太阳质量的恒星形成星系由三个部分组成:半光半径小于100秒差距的高度致密核心、半径约400秒差距的活跃恒星形成盘,以及一个恒星形成团块,三者均呈现出截然不同的恒星形成历史。该星系的中心恒星质量密度与现今质量最大的椭圆星系相比在两倍以内,但其整体质量要小1000倍。比恒星形成率的径向分布向星系外围呈上升趋势。这一证据表明,人类首次在再电离时期探测到作为原核球的星系与恒星形成盘共同呈现的由内向外生长现象。

英文摘要:

The physical processes that establish the morphological evolution and the structural diversity of galaxies are key unknowns in extragalactic astrophysics. Here we report the finding of the morphologically-mature galaxy JADES-GS+53.18343-27.79097, which existed within the first 700 million years of the Universe's history. This star-forming galaxy with a stellar mass of 400 million solar masses consists of three components, a highly-compact core with a half-light radius of less than 100 pc, an actively star-forming disc with a radius of about 400 pc, and a star-forming clump, which all show distinctive star-formation histories. The central stellar mass density of this galaxy is within a factor of two of the most massive present-day ellipticals, while being globally 1000 times less massive. The radial profile of the specific star-formation rate is rising toward the outskirts. This evidence suggests the first detection of inside-out growth of a galaxy as a proto-bulge and a star-forming disc in the Epoch of Reionization.

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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