| Name: | Devang Somawanshi |
| Affiliation: | Indian Institute of Science Education and Research Bhopal |
| Conference ID : | ASI2024_263 |
| Title : | MUSE view of thick and thin disc stellar population properties in edge-on spiral galaxies |
| Authors : | Devang Somawanshi, Souradeep Bhattacharya, Manish Kataria, Chiaki Kobayashi. |
| Authors Affiliation: | 1 Devang Somawanshi (Indian Institute of Science Education and Research Bhopal, Bhopal-462 066, India)
2 Souradeep Bhattacharya, Manish Kataria (Inter-University Centre for Astronomy and Astrophysics, Pune-411007, India)
3 Chiaki Kobayashi (University of Hertfordshire, Hatfield-AL10 9AB, UK) |
| Mode of Presentation: | Poster |
| Abstract Category : | Galaxies and Cosmology |
| Abstract : | Edge-on galaxies are the best laboratories to understand the origin of thin and thick discs in galaxies. Measurement of spatially resolved stellar population properties in such galaxies, particularly age, metallicity and [𝛼/Fe], are crucial to understanding the formation and evolution of galaxy discs. Such measurements are made possible from the stellar population model that fits deep integral field spectroscopic (IFU) observations of galaxies. We present the utilisation of MUSE IFU observations of the edge-on galaxy ESO 544-27 to uncover the formation history of its thin and thick discs using its stellar populations. We found that the thin disc of the galaxy is dominated by an old low [𝛼/Fe] metal-rich stellar population that later diluted with metal-poor gas. The thin and thick disc has a significant old low [𝛼/Fe] metal-poor population. The thick disc has a high [𝛼/Fe] metal-rich component that was likely formed with higher star-formation efficiency than the Milky Way thick disc. The galaxy was nearly quenched until it was reignited by a recent wet major merger event with a metal-rich dwarf galaxy, which deposited its newly formed stars primarily in the thick disc of ESO 544-27. The thin and thick discs of ESO 544-27 have unique origins compared to that of other known disc galaxies (including the Milky Way) |
