Speaker
Description
We study outflows in 130 galaxies with 16<M_UV<-22 at z=3-9 identified in JWST spectroscopic data taken by the CEERS, ERO, FRESCO, GLASS, and JADES programs. We identify 30 out of the 130 galaxies with broad components of FWHM ~150-800 km/s in the emission lines of Hα and [OIII]5007 that trace ionized outflows. Four out of the 30 outflowing galaxies are Type 1 AGNs whose Hα emission lines include line profile components as broad as FWHM>1000 km/s. With the velocity shift and line widths of the outflow broad lines, we obtain ~80-500 km/s for the outflow velocities. We find that the outflow velocities as a function of star-formation rate are comparable to or higher than those of galaxies at z~1 while the outflow velocities of AGNs are large but not significantly different from the others. Interestingly, these outflow velocities are typically not high enough to escape from the galactic potentials, suggestive of fountain-type outflows. We estimate mass-loading factors to be η=0.1-1 that are not particularly large, but comparable with those of z~1 outflows. The large fraction of galaxies with outflows provides constraints on outflow parameters, suggesting a wide opening angle of $>45$ deg and a large duty-cycle of $>30\%$, which gives a picture of more frequent and spherical outflows in high-z galaxies.
