Metallicities of Young Massive Clusters in NGC 5236 (M83)

Svea Hernandez, Søren Larsen, Scott Trager, Lex Kaper, Paul Groot

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Abstract

We present integrated-light spectra of 8 Young Massive Clusters (YMCs) in the metal-rich spiral galaxy NGC 5236 (M 83). The observations were taken with the X-Shooter spectrograph on the ESO Very Large Telescope. Through the use of theoretical isochrones and synthetic integrated-light (IL) spectra we derive metallicities and study the radial metallicity gradient observed through these young populations. For the inner regions of the galaxy we observe a relatively shallow metallicity gradient of $-$0.37 $\pm$0.29 dex R$_{25}^{-1}$, agreeing with chemical evolution models with an absence of infall material and a relatively low mass loss due to winds in the inner parts of the disk. We estimate a central metallicity of [$Z$] = $+$0.17 $\pm$ 0.12 dex, finding excellent agreement with that obtained via other methods (e.g. blue supergiants and J-band). We infer a metallicity of 12+log(O/H) = 8.75 $\pm$ 0.08 dex at R/R$_{25}$ = 0.4, which fits the stellar mass-metallicity relation (MZR) compilation of blue supergiants and IL studies.
Original languageEnglish
Pages (from-to)826-837
Number of pages12
JournalMonthly Notices of the Royal Astronomical Society
Volume473
Issue number1
DOIs
Publication statusPublished - Jan-2018

Keywords

  • Astrophysics - Astrophysics of Galaxies
  • MODEL ATMOSPHERES
  • STELLAR EVOLUTION
  • H-II REGIONS
  • STAR-FORMING GALAXIES
  • EXTRAGALACTIC HII-REGIONS
  • SPIRAL GALAXIES
  • CHEMICAL-COMPOSITION
  • NEBULAR ABUNDANCES
  • OPTICAL SPECTROSCOPY
  • ARAUCARIA-PROJECT

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