Current galaxy observations suggest that a roughly linear correlation exists between the [C II] emission and the star formation rate, either as spatially resolved or integrated quantities. Observationally, this correlation seems to be independent of metallicity, but the very large scatter does not allow to properly assess whether this is true. On the other hand, theoretical models tend to suggest a metallicity dependence of the correlation. In this study, we investigate the metallicity evolution of the correlation via a high-resolution zoom-in cosmological simulation of a dwarf galaxy employing state-of-the-art sub-grid modelling for gas cooling, star formation, and stellar feedback, and that self-consistently evolves the abundances of metal elements out of equilibrium. Our results suggest that the correlation should evolve with metallicity, in agreement with theoretical predictions, but also that this evolution can be hardly detected in observations, because of the large scatter. We also find that most of the [C II] emission is associated with neutral gas at low-intermediate densities, whereas the highest emissivity is produced by the densest regions around star-forming regions.

Lupi, A., Bovino, S. (2020). The [C II]-SFR correlation in dwarf galaxies across cosmic time. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 492(2), 2818-2827 [10.1093/mnras/staa048].

The [C II]-SFR correlation in dwarf galaxies across cosmic time

Lupi A.
;
2020

Abstract

Current galaxy observations suggest that a roughly linear correlation exists between the [C II] emission and the star formation rate, either as spatially resolved or integrated quantities. Observationally, this correlation seems to be independent of metallicity, but the very large scatter does not allow to properly assess whether this is true. On the other hand, theoretical models tend to suggest a metallicity dependence of the correlation. In this study, we investigate the metallicity evolution of the correlation via a high-resolution zoom-in cosmological simulation of a dwarf galaxy employing state-of-the-art sub-grid modelling for gas cooling, star formation, and stellar feedback, and that self-consistently evolves the abundances of metal elements out of equilibrium. Our results suggest that the correlation should evolve with metallicity, in agreement with theoretical predictions, but also that this evolution can be hardly detected in observations, because of the large scatter. We also find that most of the [C II] emission is associated with neutral gas at low-intermediate densities, whereas the highest emissivity is produced by the densest regions around star-forming regions.
Articolo in rivista - Articolo scientifico
Galaxies: evolution; Galaxies: formation; Galaxies: ISM; ISM: molecules
English
10-gen-2020
2020
492
2
2818
2827
none
Lupi, A., Bovino, S. (2020). The [C II]-SFR correlation in dwarf galaxies across cosmic time. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 492(2), 2818-2827 [10.1093/mnras/staa048].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/295535
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