The low dark matter content of the lenticular galaxy NGC 3998

N. F. Boardman, A. Weijmans, R. C. E. van den Bosch, L. Zhu, A. Yildirim, G. van de Ven, M. Cappellari, P. T. de Zeeuw, E. Emsellem, D. Krajnović, T. Naab

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10 Citations (Scopus)


We observed the lenticular galaxy NGC 3998 with the Mitchell Integral-Field Spectrograph and extracted line-of-sight velocity distributions out to three half-light radii. We constructed collisionless orbit models in order to constrain NGC 3998's dark and visible structure, using kinematics from both the Mitchell and SAURON instruments. We find NGC 3998 to be almost axisymmetric, seen nearly face-on with a flattened intrinsic shape – i.e. a face-on fast rotator. We find an I-band mass-to-light ratio of 4.7 +0.32/−0.45 in good agreement with previous spectral fitting results for this galaxy. Our best-fitting orbit model shows a both a bulge and a disc component, with a non-negligible counter-rotating component also evident. We find that relatively little dark matter is needed to model this galaxy, with an inferred dark mass fraction of just 7.1 +8.1/−7.1 percent within one half-light radius.
Original languageEnglish
Pages (from-to)3029-3043
JournalMonthly Notices of the Royal Astronomical Society
Issue number3
Early online date20 May 2016
Publication statusPublished - 11 Aug 2016


  • Dark matter
  • Galaxies: elliptical and lenticular, CD
  • Galaxies: ISM
  • Galaxies: kinematics and dynamics
  • Galaxies: structure
  • ISM: kinematics and dynamics


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