Dense and warm neutral gas in BR 1202-0725 at z = 4.7 as traced by the [O I] 
145 μm line

Lee, Minju M.; Nagao, Tohru; Breuck, Carlos De; Carniani, Stefano; Cresci, Giovanni; Hatsukade, Bunyo; Kawabe, Ryohei; Kohno, Kotaro; Maiolino, Roberto; Mannucci, Fillipo; Marconi, Alessandro; Nakanishi, Kouichiro; Troncoso, Paulina; Umehata, Hideki

doi:10.3847/1538-4357/abe7ea

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Dense and warm neutral gas in BR 1202-0725 at z = 4.7 as traced by the [O I] 145 μm line

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Lee, Minju M.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

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Citation

Lee, M. M., Nagao, T., Breuck, C. D., Carniani, S., Cresci, G., Hatsukade, B., et al. (2021). Dense and warm neutral gas in BR 1202-0725 at z = 4.7 as traced by the [O I] 145 μm line. The Astrophysical Journal, 913(1): 41. doi:10.3847/1538-4357/abe7ea.

Cite as: https://hdl.handle.net/21.11116/0000-0009-1A82-7

Abstract

We report the detection of [O I] 145.5 μm in the BR 1202-0725 system, a compact group at z = 4.7 consisting of a quasar (QSO), a submillimeter-bright galaxy (SMG), and three faint Lyα emitters. By taking into account the previous detections and upper limits, the [O I] /[C II] line ratios of the now five known high-z galaxies are higher than or on the high end of the observed values in local galaxies ([O I] /[C II] ≳ 0.13). The high [O I] /[C II] ratios and the joint analysis with previous detection of [N II] lines for both of the QSO and the SMG suggest the presence of warm and dense neutral gas in these highly star-forming galaxies. This is further supported by new CO (12–11) line detections and a comparison with cosmological simulations. There is a possible positive correlation between the [N II] 122/205 line ratio and the [O I] /[C II] ratio when all local and high-z sources are taken into account, indicating that the denser the ionized gas, the denser and warmer the neutral gas (or vice versa). The detection of the [O I] line in the BR 1202-0725 system with a relatively short amount of integration with Atacama Large Millimeter/submillimeter Array (ALMA) demonstrates the great potential of this line as a dense gas tracer for high-z galaxies.