The WAGGS project - I. The WiFeS Atlas of Galactic Globular cluster Spectra

Christopher Usher, Nicola Pastorello, Sabine Bellstedt, Adebusola Alabi, Pierluigi Cerulo, Leonie Chevalier, Amelia Fraser-McKelvie, Samantha Penny, Caroline Foster, Richard M. McDermid, Ricardo P. Schiavon, Alexa Villaume

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Abstract

We present the WiFeS Atlas of Galactic Globular cluster Spectra, a library of integrated spectra of Milky Way and Local Group globular clusters. We used the WiFeS integral field spectrograph on the Australian National University 2.3 m telescope to observe the central regions of 64 Milky Way globular clusters and 22 globular clusters hosted by the Milky Way's low mass satellite galaxies. The spectra have wider wavelength coverage (3300 to 9050 Å) and higher spectral resolution (R = 6800) than existing spectral libraries of Milky Way globular clusters. By including Large and Small Magellanic Cloud star clusters, we extend the coverage of parameter space of existing libraries towards young and intermediate ages. While testing stellar population synthesis models and analysis techniques is the main aim of this library, the observations may also further our understanding of the stellar populations of Local Group globular clusters and make possible the direct comparison of extragalactic globular cluster integrated light observations with well understood globular clusters in the Milky Way. The integrated spectra are publicly available via the project website.
Original languageEnglish
Pages (from-to)3828-3849
Number of pages22
JournalMonthly Notices of the Royal Astronomical Society
Volume468
Issue number4
Early online date23 Mar 2017
DOIs
Publication statusPublished - 1 Jul 2017

Keywords

  • astro-ph.GA
  • globular clusters: general
  • galaxies: abundances
  • Local Group
  • galaxies: stellar content

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