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- W4226280251 endingPage "36" @default.
- W4226280251 startingPage "36" @default.
- W4226280251 abstract "Abstract Both observations and cosmological simulations have recently shown that there is a large scatter in the number of satellites of Milky Way (MW)–like galaxies. In this study, we investigate the relation between the satellite number and galaxy group assembly history using the r -band magnitude gap (Δ m 12 ) between the brightest and second-brightest galaxies as an indicator. From 20 deg 2 of the Hyper Suprime-Cam Subaru Strategic Program Wide layer, we identify 17 dwarf satellite candidates around NGC 4437, a spiral galaxy with about one-fourth of the MW stellar mass. We estimate their distances using the surface brightness fluctuation method. Then we confirm five candidates as members of the NGC 4437 group, resulting in a total of seven group members. Combining the NGC 4437 group (with Δ m 12 = 2.5 mag) with other groups in the literature, we find a stratification of the satellite number by Δ m 12 for a given host stellar mass. The satellite number for the given host stellar mass decreases as Δ m 12 increases. The same trend is found in simulated galaxy groups in the TNG50 simulation of the IllustrisTNG project. We also find that the host galaxies in groups with a smaller Δ m 12 (like NGC 4437) have assembled their halo mass more recently than those in larger gap groups, and that their stellar-to-halo mass ratios increase as Δ m 12 increases. These results show that the large scatter in the satellite number is consistent with a large range of Δ m 12 , indicating diverse group assembly histories." @default.
- W4226280251 created "2022-05-05" @default.
- W4226280251 creator A5030965127 @default.
- W4226280251 creator A5057843314 @default.
- W4226280251 creator A5057915992 @default.
- W4226280251 creator A5079436434 @default.
- W4226280251 date "2022-04-01" @default.
- W4226280251 modified "2023-09-25" @default.
- W4226280251 title "A Rich Satellite Population of the NGC 4437 Group and Implications of a Magnitude Gap for Galaxy Group Assembly History" @default.
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- W4226280251 doi "https://doi.org/10.3847/1538-4357/ac58f3" @default.