| Autor: |
Lee, Minju M., Nagao, Tohru, De Breuck, Carlos, Carniani, Stefano, Cresci, Giovanni, Hatsukade, Bunyo, Kawabe, Ryohei, Kohno, Kotaro, Maiolino, Roberto, Mannucci, Fillipo, Marconi, Alessandro, Nakanishi, Kouichiro, Troncoso, Paulina, Umehata, Hideki |
| Předmět: |
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| Zdroj: |
Astrophysical Journal; 5/20/2021, Vol. 913 Issue 1, p1-9, 9p |
| Abstrakt: |
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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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