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- W2794541345 abstract "The physical origin of diffuse Ly$alpha$ halos (LAHs) around star-forming galaxies is still a matter of debate. We present the dependence of LAH luminosity ($L({rm Ly}alpha)_H$) on the stellar mass ($M_star$), $SFR$, color excess ($E(B-V)_star$), and dark matter halo mass ($M_{rm h}$) of the parent galaxy for $sim 900$ Ly$alpha$ emitters (LAEs) at $zsim2$ divided into ten subsamples. We calculate $L({rm Ly}alpha)_H$ using the stacked observational relation between $L({rm Ly}alpha)_H$ and central Ly$alpha$ luminosity by Momose et al. (2016), which we find agrees with the average trend of VLT/MUSE-detected individual LAEs. We find that our LAEs have relatively high $L({rm Ly}alpha)_H$ despite low $M_star$ and $M_{rm h}$, and that $L({rm Ly}alpha)_H$ remains almost unchanged with $M_star$ and perhaps with $M_{rm h}$. These results are incompatible with the cold stream (cooling radiation) scenario and the satellite-galaxy star-formation scenario, because the former predicts fainter $L({rm Ly}alpha)_H$ and both predict steeper $L({rm Ly}alpha)_H$ vs. $M_star$ slopes. We argue that LAHs are mainly caused by Ly$alpha$ photons escaping from the main body and then scattered in the circum-galactic medium. This argument is supported by LAH observations of H$alpha$ emitters (HAEs). When LAHs are taken into account, the Ly$alpha$ escape fractions of our LAEs are about ten times higher than those of HAEs with similar $M_star$ or $E(B-V)_star$, which may partly arise from lower HI gas masses implied from lower $M_{rm h}$ at fixed $M_star$, or from another Ly$alpha$ source in the central part." @default.
- W2794541345 created "2018-04-06" @default.
- W2794541345 creator A5016939316 @default.
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- W2794541345 creator A5075313804 @default.
- W2794541345 creator A5081052936 @default.
- W2794541345 date "2019-05-16" @default.
- W2794541345 modified "2023-10-16" @default.
- W2794541345 title "The dominant origin of diffuse Lyα halos around Lyα emitters explored by spectral energy distribution fitting and clustering analysis" @default.
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