Telltale signs of metal recycling in the circumgalactic medium of a $z \sim 0.77$ galaxy
| Autor: | Tejos, N., López, S., Ledoux, C., Fernández-Figueroa, A., Rivas, N., Sharon, K., Johnston, E. J., Florian, M. K., D'Ago, G., Katsianis, A., Barrientos, F., Berg, T., Corro-Guerra, F., Hamel, M., Moya-Sierralta, C., Poudel, S., Rigby, J. R., Solimano, M. |
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| Rok vydání: | 2021 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1093/mnras/stab2147 |
| Popis: | We present gravitational-arc tomography of the cool-warm enriched circumgalactic medium (CGM) of an isolated galaxy (``G1'') at $z \approx 0.77$. Combining VLT/MUSE adaptive-optics and Magellan/MagE echelle spectroscopy we obtain partially-resolved kinematics of MgII in absorption and [OII] in emission. The unique arc configuration allows us to probe 42 spatially independent arc positions transverse to G1, plus 4 positions in front of it. The transverse positions cover G1's minor and major axes at impact parameters of $\approx 10-30$ kpc and $\approx 60$ kpc, respectively. We observe a direct kinematic connection between the cool-warm enriched CGM (traced by MgII) and the interstellar medium (traced by [OII]). This provides strong evidence for the existence of an extended disc that co-rotates with the galaxy out to tens of kiloparsecs. The MgII velocity dispersion ($\sigma \approx 30-100$ km s$^{-1}$, depending on position) is of the same order as the modeled galaxy rotational velocity ($v_{\rm rot} \approx 80$ km s$^{-1}$), providing evidence for the presence of a turbulent and pressure-supported CGM component. We regard the absorption to be modulated by a galactic-scale outflow, as it offers a natural scenario for the observed line-of-sight dispersion and asymmetric profiles observed against both the arcs and the galaxy. An extended enriched co-rotating disc together with the signatures of a galactic outflow, are telltale signs of metal recycling in the $z\sim 1$ CGM. Comment: MNRAS accepted. Moderate changes after addressing referee feedback, including a correction in the systemic redshift; all qualitative results and conclusions remain the same |
| Databáze: | arXiv |
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