WFRF:(Micheva Genoveva)
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The Red Halo Phenomenon
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- Zackrisson, Erik (author)
- Uppsala universitet,Institutionen för astronomi och rymdfysik
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- Bergvall, Nils (author)
- Uppsala universitet,Institutionen för astronomi och rymdfysik,galax
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- Östlin, Göran (author)
- Stockholms universitet,Institutionen för astronomi
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- (creator_code:org_t)
- American Astronomical Society, 2006
- 2006
- English.
- In: Astrophysical Journal. - : American Astronomical Society. - 0004-637X .- 1538-4357. ; 650:2, s. 812-817
- Journal article (peer-reviewed)
Abstract
Subject headings
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- Optical and near-IR observations of the halos of disk galaxies and blue compact galaxies have revealed a very red spectral energy distribution that cannot easily be reconciled with a normal, metal-poor stellar population such as that in the stellar halo of the Milky Way. Here spectral evolutionary models are used to explore the consequences of these observations. We demonstrate that a stellar population of low to intermediate metallicity but with an extremely bottom-heavy initial mass function can explain the red halos around both types of objects. Other previously suggested explanations, such as nebular emission or very metal-rich stars, are shown to fail in this respect. This indicates that if the reported halo colors are correct, halo populations dominated by low-mass stars may be a phenomenon common to galaxies of very different Hubble types. Potential tests of this hypothesis are discussed, along with its implications for the baryonic dark matter content of galaxies.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- Cosmology: Dark Matter
- Galaxies: Evolution
- Galaxies: Halos
- Galaxies: Stellar Content
- Physics
- Fysik
- Extragalactical astronomy
Publication and Content Type
- ref (subject category)
- art (subject category)
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- Leksell, Maria
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