Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/30847
Campo DC | Valore | Lingua |
---|---|---|
dc.contributor.author | Sarzi, Marc | en_US |
dc.contributor.author | SPINIELLO, CHIARA | en_US |
dc.contributor.author | LA BARBERA, Francesco | en_US |
dc.contributor.author | Krajnović, Davor | en_US |
dc.contributor.author | van den Bosch, Remco | en_US |
dc.date.accessioned | 2021-04-22T11:11:24Z | - |
dc.date.available | 2021-04-22T11:11:24Z | - |
dc.date.issued | 2018 | en_US |
dc.identifier.issn | 0035-8711 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/30847 | - |
dc.description.abstract | Based on Multi-Unit Spectroscopic Explorer (MUSE) integral-field data we present evidence for a radial variation at the low-mass end of the stellar initial-mass function (IMF) in the central regions of the giant early-type galaxy NGC 4486 (M87). We used state-of-the-art stellar-population models and the observed strength of various IMF-sensitive absorption-line features to solve for the best low-mass tapered `bimodal' form of the IMF, while accounting also for variations in stellar metallicity, the overall α-elements abundance and the abundance of individual elements such as Ti, O, Na, and Ca. Our analysis reveals a strong negative IMF gradient corresponding to an exceeding fraction of low-mass stars compare(Cappellari & d to the case of the Milky Way towards the centre of M87, which drops to nearly Milky Way levels by 0.4 R<SUB>e</SUB>. Such IMF variations correspond to over a factor 2 increase in stellar mass-to-light M/L ratio compared to the case of a Milky Way IMF, consistent with independent constraints on M/L radial variations in M87 from dynamical models. We also looked into the abundance of sodium in M87, which turned up to be super-Solar over the entire radial range of our MUSE observations and to exhibit a considerable negative gradient. These findings suggest an additional role of metallicity in boosting the Na-yields in the central, metal-rich regions of M87 during its early and brief star formation history. Our work adds M87 to the few objects that presently have radial constraints on their IMF or [Na/Fe] abundance, while also illustrating the accuracy that MUSE could bring to this kind of investigations. | en_US |
dc.language.iso | eng | en_US |
dc.title | MUSE observations of M87: radial gradients for the stellar initial-mass function and the abundance of sodium | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1093/mnras/sty1092 | en_US |
dc.identifier.scopus | 2-s2.0-85051546468 | en_US |
dc.identifier.url | http://arxiv.org/abs/1711.08980v1 | en_US |
dc.identifier.url | https://academic.oup.com/mnras/article/478/3/4084/4992755 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 478 | en_US |
dc.relation.issue | 3 | en_US |
dc.relation.firstpage | 4084 | en_US |
dc.relation.lastpage | 4100 | 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 | 2018MNRAS.478.4084S | 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.cerifentitytype | Publications | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
item.grantfulltext | open | - |
item.languageiso639-1 | en | - |
item.openairetype | Article | - |
crisitem.journal.journalissn | 0035-8711 | - |
crisitem.journal.ance | E112946 | - |
crisitem.author.dept | O.A. Capodimonte | - |
crisitem.author.orcid | 0000-0003-1181-6841 | - |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
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File | Descrizione | Dimensioni | Formato | |
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1711.08980.pdf | preprint | 7.72 MB | Adobe PDF | Visualizza/apri |
sty1092.pdf | Pdf editoriale | 3.16 MB | Adobe PDF | Visualizza/apri |
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