Abstract
| Klinmenko |
|---|
| Cool-gas metallicity distribution around nearby galaxies mapped with integral field spectroscopy |
| Combining cool-gas metallicity and warm-gas metallicity is essential to build a complete census of metals in and around galaxies. While comparisons of cool-gas metallicity and warm-gas metallicity have been performed in integral field spectroscopy (IFS) studies of quasar absorbers at higher redshifts, we present for the first time such comparison for the z~0 galaxies that have much more detailed information. We present a study of the CGM of 14 galaxies at z<0.1 that have been mapped with IFS by measuring absorption lines produced by the gas in HST/COS spectra of background quasars/AGN at impact parameters of 0-25 effective radii from the galaxy center. We report measurements of the CGM metallicity along sightlines at various elevation angles and comparisons with the metallicity gradient in the disk measured by modelling the IFS maps. Our results for the CGM metallicity, ionization, and gas velocities are consistent with expectations for gas flows in and out of the galaxies. The azimuthal angle distribution of the CGM metallicity and the dependence of CGM metallicity on galaxy stellar mass are consistent with predictions from TNG50 simulations. Our small sample offers the first detailed comparisons of CGM properties with extrapolations of detailed galaxy maps from IFS. Similar studies for larger samples are needed to understand how stellar components of galaxies interact with the CGM and how metals are distributed around galaxies. We acknowledge support from NASA/STScI. |