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Made-to-measure galaxy models – II. Elliptical and lenticular galaxies

Authors

  • R. J. Long,

    Corresponding author
    1. National Astronomical Observatories, Chinese Academy of Sciences, A20 Datun Road, Chaoyang District, Beijing 100012, China
    2. Jodrell Bank Centre for Astrophysics, Alan Turing Building, The University of Manchester, Manchester M13 9PL
      E-mail: rjl2007@gmail.com (RJL); smao@nao.cas.cn (SM)
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  • Shude Mao

    Corresponding author
    1. National Astronomical Observatories, Chinese Academy of Sciences, A20 Datun Road, Chaoyang District, Beijing 100012, China
    2. Jodrell Bank Centre for Astrophysics, Alan Turing Building, The University of Manchester, Manchester M13 9PL
      E-mail: rjl2007@gmail.com (RJL); smao@nao.cas.cn (SM)
    Search for more papers by this author

E-mail: rjl2007@gmail.com (RJL); smao@nao.cas.cn (SM)

ABSTRACT

We take a sample of 24 elliptical and lenticular galaxies previously analysed by the SAURON project using three integral dynamical models created with Schwarzschild method, and re-analyse them using the made-to-measure (M2M) method of dynamical modelling. We obtain good agreement between the two methods in determining the dynamical mass-to-light ratios (M/L values) for the galaxies with over 80 per cent of ratios differing by <10 per cent and over 95 per cent differing by <20 per cent. We show that inline image. For the global velocity dispersion anisotropy parameter δ, we find similar values but with fewer of the M2M models tangentially anisotropic by comparison with their SAURON Schwarzschild counterparts. Our investigation is the largest comparative application of the M2M method to date.

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