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- W4305014568 abstract "Based on galaxies in the Sloan Digital Sky Survey Data Release 7 (SDSS DR7) and dark matter haloes in the dark matter only, cosmological and constrained ELUCID simulation, we investigate the relation between the observed radii of central galaxies with stellar mass $gtrsim 10^{8} h^{-2}{rm M}_odot$ and the virial radii of their host dark matter haloes with virial mass $gtrsim 10^{10.5} h^{-1}{rm M}_odot$, and the dependence of galaxy-halo size relation on the halo spin and concentration. Galaxies in observation are matched to dark matter (sub-)haloes in the ELUCID simulation using a novel neighborhood subhalo abundance matching method. For galaxy 2D half-light radii $R_{50}$, we find that early- and late-type galaxies have the same power-law index 0.55 with $R_{50} propto R_{rm vir}^{0.55}$, although early-type galaxies have smaller 2D half-light radii than late-type galaxies at fixed halo virial radii. When converting the 2D half-light radii $R_{50}$ to 3D half-mass radii $r_{1/2}$, both early- and late-type galaxies display similar galaxy-halo size relations with $log r_{1/2} = 0.55 log (R_{rm vir}/210 h^{-1}{rm kpc}) + 0.39$. We find that the galaxy-halo size ratio $r_{1/2}/ R_{rm vir}$ decreases with increasing halo mass. At fixed halo mass, there is no significant dependence of galaxy-halo size ratio on the halo spin or concentration." @default.
- W4305014568 created "2022-10-14" @default.
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- W4305014568 date "2022-10-11" @default.
- W4305014568 modified "2023-10-18" @default.
- W4305014568 title "Galaxy-halo size relation from SDSS DR7 and the ELUCID simulation" @default.
- W4305014568 doi "https://doi.org/10.48550/arxiv.2210.05215" @default.
- W4305014568 hasPublicationYear "2022" @default.
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