8 papers
A Direct DESI--SDSS Two-Fibre Test of Aperture Bias in Optical Emission-Line Diagnostics
Shihong Liu, Yu Rong
Fixed angular apertures sample different physical regions of nearby galaxies and can therefore bias optical emission-line diagnostics. We use 20,545 high-confidence emission-line g…
Stellar Surface Density Modulates MgII Cool-gas Outflow Absorption in DESI Star-forming Galaxies
Yu Rong, Shihong Liu
Galaxy outflows are usually ordered by stellar mass and star-formation rate (SFR), but the same feedback budget may couple differently to gas in diffuse and compact galaxies. We us…
A DESI Calibration of the [O II]--[S II] Electron-density Offset in Integrated Star-forming Galaxies
Yu Rong, Shihong Liu, Hu Zou
The [O II] and [S II] doublets are widely used as low-ionization electron-density diagnostics in galaxy spectra and are often treated as inter…
Electron Densities of Typical Low-Mass Galaxies at z~2-7 from Stacked JWST/NIRSpec Spectra
Shihong Liu, Yu Rong
Direct electron-density measurements at high redshift are usually limited to galaxies with individually strong density-sensitive doublets, and therefore may not trace the average i…
Updated Metallicity Diagnostics for Precision Oxygen Abundance Measurements in High-redshift Galaxies with JWST
Shihong Liu, Yu Rong, Tie Li +7
Recent work has demonstrated that widely used strong-line oxygen abundance indicators, such as O3N2, , and , suffer from large uncertainties when applied…
The Internal Kinematics, Stellar Population, and Gas-phase Properties of The Pseudobulge in An Ultra-diffuse Galaxy: AGC721966
Shihong Liu, Yu Rong, Huiyuan Wang +8
Leveraging spectroscopic data from the Sloan Digital Sky Survey, we conduct a comprehensive analysis of the central stellar velocity dispersion, stellar population properties, star…
Strong Correlation between Galactic HI-to-stellar Mass Ratio And Halo Spin Explored by HI-rich Galaxies
Shihong Liu, Yu Rong, Zichen Hua +1
Using a semi-analytic approach, we estimate halo spins for a large sample of HI-rich galaxies from the Arecibo Legacy Fast Alfa Survey and examine the correlation between HI mass f…
Halo Spin Depends on The Distance to Cosmic Filament
Shihong Liu, Yu Rong
We employ a semi-analytical methodology to estimate the dark matter halo spin of HI-rich galaxies in the Arecibo Legacy Fast Alfa Survey and investigate the relationship between ha…