1. HI gas in disk and dwarf galaxies in the view of SAMs
Fu Jian (富坚)
Shanghai Astronomical Observatory, CAS
KIAA Forum on Gas in Galaxies
Peking University

2. Galaxies in cosmological simulations
Semi-analytic models
L-Galaxies, GALFORM
Hydrodynamic Simulations
EAGLE, Illustris, Horizon-AGN
Describe baryonic processes based on dark matter N-body simulation
Simulating dark matter and baryonic matter at the same time

3. The newest version of L-Galaxies SAMs
L-Galaxies SAMs developed by Munich group
Public version Henriques et al. (2015)
garching.mpg.de/public/LGalaxies/
Main branches
Radial resolved models of HI and H2 gas components (Fu et al. 2013)
Chemical abundance models for different elements (Yates et al. 2014)
Cold gas stripping process and star formation quenching by ram pressure (Luo et al. 2016)

4. The radial resolved disks and radial profiles
HI-H2-HII transition prescriptions
1: Krumholz et al. 2009; Mckee & Krumholz 2010
2: Pressure related H2 fraction recipe (B&R 2006)
3: Molecular-atomic-ionized gas (Gnedin& Kravtsov 2011)
H2 proportional star formation law
Exponential infalling gas

5. The chemical enrichment models
Two types of supernovae and AGBs instead of IRA (Chabrier03 IMF)
Results of 11 elements in IMF (H He C N O Ne Mg Si S Ca Fe)
Pristine gas for original infall: 75% H and 25% He

6. Radial resolved disks with chemical enrichments
Radial bins array, star formation history, metallicity arrays
A lot more memory and time consumption
—— options can be switched off
—— still a lot faster that hydrodynamic simulation

7. Dark matter halo for L-Galaxies
Millennium II Simulation
Millennium Simulation
For the observations of HI and H2 these years, modelers try to describe
Based on n-body simulation
Aquarius Simulation

8. The L-Galaxies models on ELUCID haloes
ELUCID simulation (Wang, Mo, Yang et al. 2014)
Reconstruct the initial density field according to local universe
Same to the data structure of Millennium Simulation
ELUCID项目-利用再构造初始密度场研究近邻宇宙。
•由中科大、上海交大、清华大学等多方合作。
•可以精确再现宇宙演化历史，精确度较其他方法提高2-3倍。
•依赖完备的星系群列表信息

9. similar in different types of galaxies
Radial profiles for HI gas
Size-mass relation of HI disks
Wang et al. 2016
HI-H2 transition
similar in different types of galaxies

10. 21cm flux and velocity profiles of HI disks
W50
fpeak
The line profile of a model HI disk with constant circular velocity

11. HI Mass functions at z=0 Models based on Aquarius haloes
(Grcevich & Putman 2009)
Models based on ELUCID halos predict low HIMF at low HI mass end
Models based on Aquarius haloes
4 MW satellites with HI detected within 280 kpc (HIPASS)

12. Redshift evolution of HI gas in the models

13. The mock catalogue for HI survey
FAST telescope
Frequency (L-band)
MHz
Number of beams 19
Dish diameter
300 m
Survey region
-14°~+66°

14. Light-cones algorithms
Discrete redshift snapshots
continuous redshift
random tiling
Periodic box
consistent space
Kitzbichler & White 2006; Blaizot et al. 2005

15. Galaxy cluster numbers for FAST HI gas survey based on models

16. Conclusions
Models on ELUCID haloes can fit the HIMF from ALFALFA to very low mass end, which is very sensitive to the physical processes in low mass satellites, e.g SN feedback, ram pressure stripping
Our models predict a lot of gas rich low mass dark galaxies, which may offer opportunities for future HI 21cm survey in nearby by galaxies by FAST and SKA-1
The size-mass correlation of HI gas can be extended to very low mass range (MHI~107M☉), which means the prescription between HI and H2 should be similar in different types of galaxies
21cm mock catalogue show more HI rich clusters can be detected at z>1
Thank you!