N. F. Bouché, D. Krajnović, E. Emsellem, W. Mercier, J. Schaye, B. Epinat, J. Richard, B. Zoutendijk, V. Abril-Melgarejo, J. Brinchmann, R. Bacon, T. Contini, L. A. Boogaard, L. Wisotzki, M. V. Maseda, M. Steinmetz

Abstract
We present a study of the dark-matter (DM) content of gal z≈1 low mass SFGs (with M⋆ ranging from 108.5 to 1010.5 M⊙) selected among the brightest OII emitters in the deepest Multi-Unit Spectrograph Explorer (MUSE) field to date, namely the 140hr MUSE Extremely Deep Field. We perform disk-halo decompositions on their OII emission line with a 3D parametric model using galpak. The disk-halo decomposition includes a stellar, DM, gas and occasionally a bulge component, and the DM component is made of a generalized α,β,γ profile. We find that the disk stellar masses M⋆ obtained from the OII disk-halo decomposition agree with the values inferred from the spectral energy distributions. We find that the rotation curves show diverse shapes, ranging from rising to declining at large radii, the DM fractions within the half-light radius fDM(<Rhalf) are found to be 60% to 95%, extending to lower masses (densities) the results of Genzel et al. For isolated galaxies, same SFGs shows a strong preference for cored over cuspy DM profiles and the presence of DM cores occurs in galaxies with low stellar-to-halo mass ratio, logM⋆/Mvir≈−2.5. The cored/cuspiness nature of the DM profiles is found to be a strong function of the recent star-formation activity, supporting feedback induced core formation in the Cold Dark Matter context.

Keywords
galaxies: evolution; galaxies: high-redshift; galaxies: kinematics and dynamics; methods; data analysis

SF2A-2021: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics
K. Baillié A. Siebert

French Society of Astronomy and Astrophysics, Page 379
2021 December

>> ADS