Date: 2/4/2025
Arxiv: Stellar- and AGN-Driven Outflows in JWST Galaxies at z=3-9: Implications
of More Spherical Galactic Fountains
Published: 10/10/2023 4:31:21 PM
Updated: 2/3/2025 7:10:56 AM
Paper abstract: We study outflows in 130 galaxies with -221000 km s^{-1} while one galaxy is identified as a Type-2 AGN by highionization emission lines. With the velocity shift and line widths of theoutflow broad lines, we obtain ~80-500 km s^{-1} for the outflow velocities.We find that the outflow velocities are slower than low-z galaxies with similarSFRs, which may be explained by the low stellar masses of high-z galaxies. Theoutflow velocities of AGNs are large but not significantly different from theothers. Interestingly, these outflow velocities are typically not high enoughto escape from the galactic potentials, suggestive of fountain-type outflows.We estimate mass loading factors {\eta} to be 0.1-1 that are not particularlylarge, but comparable with those of z~1 outflows. The large fraction ofgalaxies with outflows (30% with high resolution data) provides constraints onoutflow parameters, suggesting a wide opening angle of >45 deg and a largeduty-cycle of >30%, which gives a picture of more frequent and sphericaloutflows in high-z galaxies.
