Conveners
Galaxy: gas
- Cheng Li (Tsinghua University)
Generally, most of the red galaxies in the local universe are observed to be quenched and have little cold gas, suggesting that the depletion/removal of cold gas is a necessary condition for galaxy quenching. However, current HI surveys are too shallow to detect the HI gas of red galaxies. In this work, we construct a new HI estimator based on the scaling relations of HI gas mass with a...
The neutral hydrogen (HI) in galaxies, intergalactic (IGM) and circumgalactic (CGM) mediums can trace the matter flow from large-scale structures to galaxies, and plays important roles in the process of galaxy formation and evolution. In this talk, I will present our efforts to detect the IGM and CGM using HI emission line with the world's largest single-dish radio telescope-FAST combined with...
A sample of 279 massive red spirals was selected optically by Guo et al., among which 166 galaxies have been observed by the ALFALFA survey. In this work, we observe HI content of the rest 113 massive red spiral galaxies using the Five-hundred- meter Aperture Spherical radio Telescope (FAST). 75 of the 113 galaxies have HI detection with a signal-to-noise ratio (S/N) greater than 4.7. Compared...
The baryonic Tully-Fisher relation (BTFR), which connects the baryonic mass of galaxies with their circular velocities, has been validated across a wide range of galaxies, from dwarf galaxies to massive galaxies. In conflict with observations, modern simulations predict a break-point at 10^9M_sun, below which BTFR bends down toward low masses. This discrepancy is one of the small scale...
