| Name: | Sioree Ansar |
| Affiliation: | Indian Institute of Astrophysics, Bengaluru |
| Conference ID : | ASI2024_388 |
| Title : | The stellar bar - dark matter halo connection in cosmological simulations. |
| Authors : | Sioree Ansar1,2, Mousumi Das1 |
| Authors Affiliation: | 1. Indian Institute of Astrophysics, Bengaluru -560034, India
2. Pondicherry University, R.V. Nagar, Kalapet 605014, Puducherry, India |
| Mode of Presentation: | Poster |
| Abstract Category : | Galaxies and Cosmology |
| Abstract : | Stellar bars in disk galaxies grow through the loss of angular momentum to their environments, which consist of the Dark matter (DM) halo, the stellar and gas disk, and interacting satellite galaxies. The exchange of angular momentum between the disk, bar and the DM halo during galaxy evolution suggests a possible connection between bar properties and DM halo spin --- the dimensionless form of DM angular momentum. We investigate the connection of halo spin and galaxy properties in the presence/absence of stellar bars, using the cosmological magneto-hydrodynamic TNG50 simulations at three redshifts z=0, 0.1 and 1. We estimate the halo spin for barred and unbarred galaxies (bar strength: 00.4) reside in low spin and low specific angular momentum DM halos, while unbarred and weakly barred galaxies (A_2/A_0<0.2) are hosted in high spin and high specific angular momentum DM halos. This inverse correlation between barred galaxies and halo spin is surprising since previous studies show that bars transfer angular momentum to DM halos. However, the correlation is more complex at higher redshift (z=1), where the halo spin for all galaxies is higher than that at z=0. Using galaxy samples in different DM halo mass ranges we show how sample selection is crucial for extraction of results. The origin of the bar-halo connection needs further investigation as it can have a significant impact on galaxy evolution models. |
