The Red Halo Phenomenon

Simple item page
dc.creatorZackrisson, E.
dc.creatorBergvall, N.
dc.creatorOstlin, G.
dc.creatorMicheva, G.
dc.creatorLeksell, M.
dc.date2006-06-09
dc.date.accessioned2026-07-07T10:39:15Z
dc.date.available2026-07-07T10:39:15Z
dc.descriptionOptical and near-IR observations of the halos of disk galaxies and blue compact galaxies have revealed a very red spectral energy distribution, which cannot easily be reconciled with a normal, metal-poor stellar population like 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, like nebular emission or very metal-rich stars, are shown to fail in this respect. This indicates that, if the reported halo colours 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.
dc.description6 pages, 3 figures, Accepted for publication in ApJ
dc.identifierhttps://arxiv.org/abs/astro-ph/0606218
dc.identifierhttp://arxiv.org/abs/astro-ph/0606218
dc.identifierAstrophys.J.650:812-817,2006
dc.identifierdoi:10.1086/506928
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/180963
dc.subjectAstrophysics
dc.titleThe Red Halo Phenomenon
dc.typetext

Files

Collections

arXiv