Kiloparsec view of a typical star-forming galaxy when the Universe was ∼1 Gyr 
old - I. Properties of outflow, halo, and interstellar medium

Herrera-Camus, R.; Schreiber, N. Förster; Genzel, R.; Tacconi, L.; Bolatto, A.; Davies, R. L.; Fisher, D.; Lutz, D.; Naab, T.; Shimizu, T.; Tadaki, K.; Übler, H.

doi:10.1051/0004-6361/202039704

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Kiloparsec view of a typical star-forming galaxy when the Universe was ∼1 Gyr old - I. Properties of outflow, halo, and interstellar medium

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Naab, T.
Computational Structure Formation, MPI for Astrophysics, Max Planck Society;

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引用

Herrera-Camus, R., Schreiber, N. F., Genzel, R., Tacconi, L., Bolatto, A., Davies, R. L., Fisher, D., Lutz, D., Naab, T., Shimizu, T., Tadaki, K., & Übler, H. (2021). Kiloparsec view of a typical star-forming galaxy when the Universe was ∼1 Gyr old - I. Properties of outflow, halo, and interstellar medium. Astronomy and Astrophysics, 649:. doi:10.1051/0004-6361/202039704.

引用: https://hdl.handle.net/21.11116/0000-0008-F58C-6

要旨

We present new Atacama Large Millimeter/Submillimeter Array observations of the [C II] 158 μm transition and the dust continuum in HZ4, a typical star-forming galaxy when the Universe was only ∼1 Gyr old (z ≈ 5.5). Our high ≈0.3″ spatial resolution allows us to study the relationships between [C II] line emission, star formation rate, and far-infrared emission on spatial scales of ∼2 kpc. In the central ∼4 kpc of HZ4, the [C II]/FIR is ∼3 × 10⁻³ on global scales as well as on spatially resolved scales of ∼2 kpc, comparable to the ratio observed in local moderate starburst galaxies such as M 82 or M 83. For the first time in an individual normal galaxy at this redshift, we find evidence for outflowing gas from the central star-forming region in the direction of the minor axis of the galaxy. The projected velocity of the outflow is ∼400 km s⁻¹, and the neutral gas-mass outflow rate is ∼3 − 6 times higher than the star formation rate in the central region. Finally, we detect a diffuse component of [C II] emission, or [C II] halo, that extends beyond the star-forming disk and has a diameter of ∼12 kpc. The outflow, which has a velocity approximately half of the escape velocity of the system, most likely partly fuels the [C II] extended emission. Together with the kinematic analysis of HZ4 (presented in a forthcoming paper), the analysis supports the hypothesis that HZ4 is a typical star-forming disk at z ∼ 5 with interstellar medium conditions similar to present-day galaxies forming stars at a similar level, driving a galactic outflow that may already play a role in its evolution.