<> "The repository administrator has not yet configured an RDF license."^^ . <> . . "The true nature of LINER galaxies, weak AGN or strong stars"^^ . "Galaxies consist of dark matter, stars, dust and substantial amounts of mostly hydrogen gas and other\r\nelements. A particular sub-class of galaxies are those which exhibit low-ionisation nuclear emission line\r\nregions (LINERs) whose spectra predominantly show emission lines from weakly ionised atoms. When\r\nfirst identified in 1980, it was clear that the necessary radiation field had to be different than stemming from\r\nall previously known galaxies with an accreting super massive black hole, i.e. with an active galactic nucleus\r\n(AGN). Various explanations were put forward, ranging from shock-ionisation, via young hot stars,\r\nto the favoured ionisation by low-luminosity AGNs. The latter explanation has since become generally\r\naccepted.\r\nThe analysis is based on a new dataset that combines, for the first time, a complete spectral and spatial\r\nview on galaxies, whereas before either the spatial component was missing or spectral coverage for the\r\nLINER diagnostic was insufficient. All regions across all individual galaxies are classified based on the\r\nstandard emission line ratio diagnostic (BPT) and show that regions with LINER-like emission at larger\r\ngalactocentric radial distances show a significant excess in flux than what would be expected from AGN\r\nillumination. Furthermore evidence in support of the hypothesis of ionisation by hot old (post-AGB) stars\r\nis obtained.\r\nThese results have two immediate consequences: it necessitates a substantial revision of previous work\r\non properties of AGN and their host galaxies where LINERs were assumed to be fully powered by the\r\naccreting black hole, and secondly it also implies a possible simplification for unified models of black\r\nhole accretion and feedback. In conclusion, our data rejects the low-luminosity AGN explanation as the\r\nsole ionisation mechanism in LINER galaxies and supports the hypothesis of ionisation by hot old stars."^^ . "2015" . . . . . . . "Robert Artur"^^ . "Singh"^^ . "Robert Artur Singh"^^ . . . . . . "The true nature of LINER galaxies, weak AGN or strong stars (Other)"^^ . . . . . . "lightbox.jpg"^^ . . . "The true nature of LINER galaxies, weak AGN or strong stars (PDF)"^^ . . . "thesis.pdf"^^ . . . "The true nature of LINER galaxies, weak AGN or strong stars (Other)"^^ . . . . . . "indexcodes.txt"^^ . . . "The true nature of LINER galaxies, weak AGN or strong stars (Other)"^^ . . . . . . "preview.jpg"^^ . . . "The true nature of LINER galaxies, weak AGN or strong stars (Other)"^^ . . . . . . "medium.jpg"^^ . . . "The true nature of LINER galaxies, weak AGN or strong stars (Other)"^^ . . . . . . "small.jpg"^^ . . "HTML Summary of #18226 \n\nThe true nature of LINER galaxies, weak AGN or strong stars\n\n" . "text/html" . . . "520 Astronomie"@de . "520 Astronomy and allied sciences"@en . .