Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/30846
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Ignacio Martín-Navarro | en_US |
dc.contributor.author | LA BARBERA, Francesco | en_US |
dc.contributor.author | Alexandre Vazdekis | en_US |
dc.contributor.author | Jesús Falcón-Barroso | en_US |
dc.contributor.author | Ignacio Ferreras | en_US |
dc.date.accessioned | 2021-04-22T11:07:12Z | - |
dc.date.available | 2021-04-22T11:07:12Z | - |
dc.date.issued | 2015 | en_US |
dc.identifier.issn | 0035-8711 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/30846 | - |
dc.description.abstract | The hypothesis of a universal initial mass function (IMF) -- motivated by observations in nearby stellar systems -- has been recently challenged by the discovery of a systematic variation of the IMF with the central velocity dispersion, {\sigma}, of early-type galaxies (ETGs), towards an excess of low-mass stars in high-{\sigma} galaxies. This trend has been derived so far from integrated spectra, and remains unexplained at present. To test whether such trend depends on the local properties within a galaxy, we have obtained new, extremely deep, spectroscopic data, for three nearby ETGs, two galaxies with high {\sigma} (~300 km/s), and one lower mass system, with {\sigma} ~ 100 km/s. From the analysis of IMF-sensitive spectral features, we find that the IMF depends significantly on galactocentric distance in the massive ETGs, with the enhanced fraction of low-mass stars f mostly confined to their central regions. In contrast, the low-{\sigma} galaxy does not show any significant radial gradient in the IMF, well described by a shallower distribution, relative to the innermost regions of massive galaxies, at all radii. Such a result indicates that the IMF should be regarded as a local (rather than global) property, and suggests a significant difference between the formation process of the core and the outer regions of massive ETGs. | en_US |
dc.language.iso | eng | en_US |
dc.title | Radial variations in the stellar initial mass function of early-type galaxies | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1093/mnras/stu2480 | en_US |
dc.identifier.scopus | 2-s2.0-84922522658 | en_US |
dc.identifier.url | http://arxiv.org/abs/1404.6533v2 | en_US |
dc.identifier.url | https://academic.oup.com/mnras/article/447/2/1033/2593650 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 447 | en_US |
dc.relation.issue | 2 | en_US |
dc.relation.firstpage | 1033 | en_US |
dc.relation.lastpage | 1048 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.numberofauthors | 5 | en_US |
dc.description.international | sì | en_US |
dc.contributor.country | ITA | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2015MNRAS.447.1033M | en_US |
dc.description.apc | no | en_US |
dc.description.oa | 1 – prodotto con file in versione Open Access (allegare il file al passo 5-Carica) | en_US |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.openairetype | Article | - |
item.languageiso639-1 | en | - |
item.cerifentitytype | Publications | - |
item.grantfulltext | open | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | O.A. Capodimonte | - |
crisitem.author.orcid | 0000-0003-1181-6841 | - |
crisitem.journal.journalissn | 0035-8711 | - |
crisitem.journal.ance | E112946 | - |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
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stu2480.pdf | Pdf editoriale | 1.03 MB | Adobe PDF | View/Open |
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