massive interacting galaxy 525 million years after the Big Bang
massive interacting galaxy 525 million years after the Big Bang
JWST observations confirm the existence of galaxies as early as 300Myr and ata higher number density than expected based on galaxy formation models and HSTobservations. Yet, sources confirmed spectroscopically in the first 500Myr haveestimated stellar masses $<5\times10^8M_\odot$, limiting the signal to noiseratio (SNR) for investigating substructure. We present a high-resolutionspectroscopic and spatially resolved study of a rare bright galaxy at$z=9.3127\pm0.0002$ with a stellar mass of$(2.5^{+0.7}_{-0.5})\times10^9M_\odot$, forming $25^{+3}_{-4}M_\odot/yr$ andwith a metallicity of $\sim0.1Z_\odot$- lower than in the local universe forthe stellar mass but in line with expectations of chemical enrichment ingalaxies 1-2Gyr after the Big Bang. The system has a morphology typicallyassociated to two interacting galaxies, with a two-component main clump of veryyoung stars (age$8$, we identify evidence ofabsorption lines (Si, C and Fe), with low confidence individual detections butSNR$>6$ when stacked. The absorption features suggest that Ly$\alpha$ is dampedby the interstellar and circumgalactic medium. Our observations provideevidence of rapid efficient build-up of mass and metals in the immediateaftermath of the Big Bang through mergers, demonstrating that massive galaxieswith several billion stars exist earlier than expected.
JWST observations confirm the existence of galaxies as early as 300Myr and ata higher number density than expected based on galaxy formation models and HSTobservations. Yet, sources confirmed spectroscopically in the first 500Myr haveestimated stellar masses $<5\times10^8M_\odot$, limiting the signal to noiseratio (SNR) for investigating substructure. We present a high-resolutionspectroscopic and spatially resolved study of a rare bright galaxy at$z=9.3127\pm0.0002$ with a stellar mass of$(2.5^{+0.7}_{-0.5})\times10^9M_\odot$, forming $25^{+3}_{-4}M_\odot/yr$ andwith a metallicity of $\sim0.1Z_\odot$- lower than in the local universe forthe stellar mass but in line with expectations of chemical enrichment ingalaxies 1-2Gyr after the Big Bang. The system has a morphology typicallyassociated to two interacting galaxies, with a two-component main clump of veryyoung stars (age$8$, we identify evidence ofabsorption lines (Si, C and Fe), with low confidence individual detections butSNR$>6$ when stacked. The absorption features suggest that Ly$\alpha$ is dampedby the interstellar and circumgalactic medium. Our observations provideevidence of rapid efficient build-up of mass and metals in the immediateaftermath of the Big Bang through mergers, demonstrating that massive galaxieswith several billion stars exist earlier than expected.
Eros Vanzella、Laura Pentericci、Marco Castellano、Adriano Fontana、Xin Wang、Danilo Marchesini、Tucker Jones、Tommaso Treu、Emiliano Merlin、Michele Trenti、Benjamin Metha、Alaina Henry、Antonello Calabró、Lilan Yang、Takahiro Morishita、Themiya Nanayakkara、Charlotte A. Mason、Diego Paris、Paola Santini、Marusa Bradac、Nicoló Dalmasso、Benedetta Vulcani、Namrata Roy、Nicha Leethochawalit、Sara Mascia、Kristan Boyett、Guido Roberts-Borsani
天文学
Eros Vanzella,Laura Pentericci,Marco Castellano,Adriano Fontana,Xin Wang,Danilo Marchesini,Tucker Jones,Tommaso Treu,Emiliano Merlin,Michele Trenti,Benjamin Metha,Alaina Henry,Antonello Calabró,Lilan Yang,Takahiro Morishita,Themiya Nanayakkara,Charlotte A. Mason,Diego Paris,Paola Santini,Marusa Bradac,Nicoló Dalmasso,Benedetta Vulcani,Namrata Roy,Nicha Leethochawalit,Sara Mascia,Kristan Boyett,Guido Roberts-Borsani.massive interacting galaxy 525 million years after the Big Bang[EB/OL].(2023-02-19)[2025-07-16].https://chinaxiv.org/abs/202303.07559.点此复制
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