INSPIRE: INvestigating Stellar Population In RElics - IV. The initial mass function slope in relics

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dc.contributor.authorMartin-Navarro, Ignacio
dc.contributor.authorSpiniello, C.
dc.contributor.authorTortora, C.
dc.contributor.authorCoccato, L.
dc.contributor.authorD'Ago, G.
dc.contributor.authorFerre-Mateu, A.
dc.contributor.authorPulsoni, C.
dc.contributor.authorHartke, J.
dc.contributor.authorArnaboldi, M.
dc.contributor.authorHunt, L.
dc.contributor.authorNapolitano, N. R.
dc.contributor.authorScognamiglio, D.
dc.contributor.authorSpavone, M.
dc.date.accessioned2025-01-20T20:15:52Z
dc.date.available2025-01-20T20:15:52Z
dc.date.issued2023
dc.description.abstractIn the last decade, growing evidence has emerged supporting a non-universal stellar initial mass function (IMF) in massive galaxies, with a larger number of dwarf stars with respect to the Milky Way (bottom-heavy IMF). However, a consensus about the mechanisms that cause IMF variations is yet to be reached. Recently, it has been suggested that stars formed early-on in cosmic time, via a star formation burst, could be characterized by a bottom-heavy IMF. A promising way to confirm this is to use relics, ultra-compact massive galaxies, almost entirely composed by these 'pristine' stars. The INvestigating Stellar Population In RElics (INSPIRE) Project aims at assembling a large sample of confirmed relics, that can serve as laboratory to investigate on the conditions of star formation in the first 1-3 Gyr of the Universe. In this third INSPIRE paper, we build a high signal-to-noise spectrum from five relics, and one from five galaxies with similar sizes, masses, and kinematical properties, but characterized by a more extended star formation history (non-relics). Our detailed stellar population analysis suggests a systematically bottom-heavier IMF slope for relics than for non-relics, adding new observational evidence for the non-universality of the IMF at various redshifts and further supporting the above proposed physical scenario.
dc.fuente.origenWOS
dc.identifier.doi10.1093/mnras/stad503
dc.identifier.eissn1365-2966
dc.identifier.issn0035-8711
dc.identifier.urihttps://doi.org/10.1093/mnras/stad503
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/92289
dc.identifier.wosidWOS:000958262600003
dc.issue.numero1
dc.language.isoen
dc.pagina.final1414
dc.pagina.inicio1408
dc.revistaMonthly notices of the royal astronomical society
dc.rightsacceso restringido
dc.subjectgalaxies: evolution
dc.subjectgalaxies: formation
dc.subjectgalaxies: star formation
dc.subjectgalaxies: stellar content
dc.titleINSPIRE: INvestigating Stellar Population In RElics - IV. The initial mass function slope in relics
dc.typeartículo
dc.volumen521
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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