期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 496, 期 4, 页码 5160-5175出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/staa1842
关键词
ISM: kinematics and dynamics; ISM: lines and bands; galaxies: evolution; galaxies: formation; galaxies: high-redshift; galaxies: ISM
资金
- European Research Council [740120]
- Carl Friedrich von SiemensForschungspreis der Alexander von Humboldt-Stiftung Research Award
- PCI Redes Internacionales project [REDI170093]
- CONICYT [PIA ACT172033]
- BASAL Centro de Astrofisica y Tecnologias Afines (CATA) [PFB-06/2007]
- European Research Council (ERC) [740120] Funding Source: European Research Council (ERC)
Far-infrared (FIR) emission lines are a powerful tool to investigate the properties of the interstellar medium, especially in high-redshift galaxies, where ALMA observations have provided unprecedented information. Interpreting such data with state-of-the-art cosmological simulations post-processed with CLOUDY, has provided insights on the internal structure and gas dynamics of these systems. However, no detailed investigation of the consistency and uncertainties of this kind of analysis has been performed to date. Here, we compare different approaches to estimate FIR line emission from state-of-the-art cosmological simulations, either with CLOUDY or with on-the-fly non-equilibrium chemistry. We find that [C II](158 mu) predictions are robust to the model variations we explored. [O I] emission lines, that typically trace colder and denser gas relative to [C II](158 mu), are instead model dependent, as these lines are strongly affected by the thermodynamic state of the gas and non-equilibrium photoionization effects. For the same reasons, [O I] lines represent an excellent tool to constrain emission models, hence future observations targeting these lines will be crucial.
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