ABSTRACT

We search for footprints of gas accretion in and around HI-rich massive galaxies with data collected in the Bluedisk project. The HI-rich galaxies tend to have an HI-rich environment, suggesting a large-scale fueling. We find the excess HI has two types of radial distributions in HI-rich galaxies, suggesting two types of gas accretion, possibly corresponding to the fountain mechanism and cosmological accretion. We investigate how disk galaxies evolve with the accreted gas. The growth of discs are tightly corelated with the total amount of HI gas, and the effect can extend to large radius, well beyond the disk breaks. Bars drive strong gas inflows and enhance central SFR in most of the barred galaxies, however, they do not always do so even when plenty of HI is available. The details could depend on the radial distribution of HI and dynamical properties of the bars. Finally, the growth of bulges are not directly related with the HI gas, no matter whether they are pseudo or classical, and no matter whether the galaxies are interacting or hosting bars.

BIO
Jing Wang spent three and half years at MPA in Germany as a visiting student before receiving her PhD from USTC in China in 2011. She then worked as a postdoc at MPA for over two years and at CSIRO/ATNF in Australia for three years. She received the Youth Qian Ren honor in 2017.

Jing Wang’s research interests are gas accretion onto galaxies; the cold gas and stellar structure of galaxies; the morphological transformation of galaxies; the relation between star formation and cold gas; the effect of cluster and group environments on galaxies. Her research relies on multi-wavelength observational analysis, especially the 21 cm emission line data that probes atomic hydrogen gas (HI). She has been actively involved in several large HI surveys, including GASS (and also its follow-up survey for molecular hydrogen, COLD GASS), Bluedisk, LVHIS, WALLABY, IMAGING, Apertif-shallow and MALS.