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- Seminars and Workshops
- Institute of Astronomy and Astrophysics
- Location
R1203 of the Astronomy-Mathematics Building, National Taiwan University
- Speaker Name
Bi-Qing For [University of Western Australia]
- State
Definitive
- Url
2023-11-22 14:20 - 15:20
Colloquium
Chasing ghosts: ultra diffuse galaxies (or is it ‘almost’ dark galaxies?)
Abstract
The benchmark cosmological ΛCDM model is widely accepted because it has successfully explained the observed large-scale structure (LSS) in the distribution of galaxies, the existence of the cosmic microwave background, and the accelerating expansion of the Universe (see e.g. Hinshaw et al. 2007; Springel et al. 2003). However, one of the most important challenges in modern astrophysics today is understanding the residual discrepancies between theoretical ΛCDM predictions and the observed Universe on galaxy-size scales. It is also unclear whether the mismatch is caused by missing physics or the limited sensitivity of our past instrumental technology. To provide new constraints for fine tuning theoretical simulations, we study objects that are presumably dark-matter dominated. In this talk, I’ll present the studies of ultra diffuse galaxies (or sometime discovered as almost dark galaxies), an update on the Australian SKA Pathfinder HI survey (WALLABY), and future prospects.
