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- W1511264103 abstract "Optical/near-IR broadband photometry of the halos of blue compact galaxies (BCGs) have revealed a very red spectral energy distribution, which cannot easily be reconciled with any normal, metal-poor stellar population. Here, three possible explanations for the red excess are explored: nebular emission, metal-rich stars and a stellar population with a very bottom-heavy initial mass function (IMF). We find, that nebular emission in BCG halos would produce very blue near-IR colours, and hence fails to explain the observed red excess. Although metal-rich stars may in principle explain the colours observed, the required stellar metallicity is very high (solar or higher), which would be a curious halo property given the low gas metallicity (~10% solar) of the central starburst in these objects. A stellar population with a low to intermediate metallicity and a very bottom-heavy IMF does however adequately reproduce the observed BCG halo colours. A bottom-heavy IMF also proves successful in explaining a similar red excess observed in the halos of stacked edge-on disk galaxies from the Sloan Digital Sky Survey. This may indicate that halos dominated by low-mass stars is a phenomenon common to galaxies of very different Hubble types." @default.
- W1511264103 created "2016-06-24" @default.
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- W1511264103 date "2004-11-18" @default.
- W1511264103 modified "2023-09-27" @default.
- W1511264103 title "Modelling the red halos of blue compact galaxies" @default.
- W1511264103 cites W1505104590 @default.
- W1511264103 doi "https://doi.org/10.48550/arxiv.astro-ph/0411537" @default.
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