Journal Article

Made-to-measure galaxy models – I. Methodology

R. J. Long and S. Mao

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 405, issue 1, pages 301-317
Published in print June 2010 | ISSN: 0035-8711
Published online June 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.16438.x
Made-to-measure galaxy models – I. Methodology

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We rederive the made-to-measure (M2M) method of Syer & Tremaine for modelling stellar systems and individual galaxies, and demonstrate how extensions to the M2M method may be implemented and used. We illustrate the enhanced M2M method by determining the mass-to-light ratio of a galaxy modelled as a Plummer sphere. From the standard galactic observables of surface brightness and line-of-sight velocity dispersion together with the h4 Gauss–Hermite coefficient of the line-of-sight velocity distribution, we successfully recover the true mass-to-light ratio of our toy galaxy. Using kinematic data from Kleyna et al., we then estimate the mass-to-light ratio of the dwarf spheroidal galaxy Draco achieving a V-band value of 539 ± 136 M/L. We describe the main aspects of creating a M2M galaxy model and show how the key modelling parameters may be determined.

Keywords: methods: N-body simulations; methods: numerical; galaxies: individual: Draco; galaxies: kinematics and dynamics

Journal Article.  9824 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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