A QUMOND galactic Nbody code, I : Poisson solver and rotation curve fitting
 Author
 GW Angus, KJ van der Heyden, B Famaey, Gianfranco Gentile (UGent) , SS McGaugh and WJG de Blok
 Organization
 Abstract
 Here we present a new particlemesh galactic Nbody code that uses the full multigrid algorithm for solving the modified Poisson equation of the quasilinear formulation of modified Newtonian dynamics (QUMOND). A novel approach for handling the boundary conditions using a refinement strategy is implemented and the accuracy of the code is compared with analytical solutions of Kuzmin discs. We then employ the code to compute the predicted rotation curves for a sample of five spiral galaxies from the THINGS sample. We generated static Nbody realizations of the galaxies according to their stellar and gaseous surface densities and allowed their distances, masstolight ratios (M/L values) and both the stellar and gas scaleheights to vary in order to estimate the bestfitting parameters. We found that NGC 3621, NGC 3521 and DDO 154 are well fitted by MOND using expected values of the distance and M/L. NGC 2403 required a moderately larger M/L than expected and NGC 2903 required a substantially larger value. The surprising result was that the scaleheight of the dominant baryonic component was well constrained by the rotation curves: the gas scaleheight for DDO 154 and the stellar scaleheight for the others. In fact, if the suggested stellar scaleheight (onefifth the stellar scalelength) was used in the case of NGC 3621 and NGC 3521 it would not be possible to produce a good fit to the inner rotation curve. For each of the four stellar dominated galaxies, we calculated the vertical velocity dispersions which we found to be, on the whole, quite typical compared with observed stellar vertical velocity dispersions of faceon spirals. We conclude that modelling the gas scaleheights of the gasrich dwarf spiral galaxies will be vital in order to make precise conclusions about MOND.
 Keywords
 galaxies: photometry, galaxies: kinematics and dynamics, galaxies: spiral, cosmology: dark matter, MODIFIED NEWTONIAN DYNAMICS, MODIFIED GRAVITY, SPIRAL GALAXIES, DISC GALAXIES, DDO 154, IC 2574, MOND, MASS, SIMULATIONS, STABILITY
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Citation
Please use this url to cite or link to this publication: http://hdl.handle.net/1854/LU2918537
 MLA
 Angus, GW, et al. “A QUMOND Galactic NBody Code, I : Poisson Solver and Rotation Curve Fitting.” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, vol. 421, no. 3, 2012, pp. 2598–609, doi:10.1111/j.13652966.2012.20532.x.
 APA
 Angus, G., van der Heyden, K., Famaey, B., Gentile, G., McGaugh, S., & de Blok, W. (2012). A QUMOND galactic Nbody code, I : Poisson solver and rotation curve fitting. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 421(3), 2598–2609. https://doi.org/10.1111/j.13652966.2012.20532.x
 Chicago authordate
 Angus, GW, KJ van der Heyden, B Famaey, Gianfranco Gentile, SS McGaugh, and WJG de Blok. 2012. “A QUMOND Galactic NBody Code, I : Poisson Solver and Rotation Curve Fitting.” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 421 (3): 2598–2609. https://doi.org/10.1111/j.13652966.2012.20532.x.
 Chicago authordate (all authors)
 Angus, GW, KJ van der Heyden, B Famaey, Gianfranco Gentile, SS McGaugh, and WJG de Blok. 2012. “A QUMOND Galactic NBody Code, I : Poisson Solver and Rotation Curve Fitting.” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 421 (3): 2598–2609. doi:10.1111/j.13652966.2012.20532.x.
 Vancouver
 1.Angus G, van der Heyden K, Famaey B, Gentile G, McGaugh S, de Blok W. A QUMOND galactic Nbody code, I : Poisson solver and rotation curve fitting. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. 2012;421(3):2598–609.
 IEEE
 [1]G. Angus, K. van der Heyden, B. Famaey, G. Gentile, S. McGaugh, and W. de Blok, “A QUMOND galactic Nbody code, I : Poisson solver and rotation curve fitting,” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, vol. 421, no. 3, pp. 2598–2609, 2012.
@article{2918537, abstract = {{Here we present a new particlemesh galactic Nbody code that uses the full multigrid algorithm for solving the modified Poisson equation of the quasilinear formulation of modified Newtonian dynamics (QUMOND). A novel approach for handling the boundary conditions using a refinement strategy is implemented and the accuracy of the code is compared with analytical solutions of Kuzmin discs. We then employ the code to compute the predicted rotation curves for a sample of five spiral galaxies from the THINGS sample. We generated static Nbody realizations of the galaxies according to their stellar and gaseous surface densities and allowed their distances, masstolight ratios (M/L values) and both the stellar and gas scaleheights to vary in order to estimate the bestfitting parameters. We found that NGC 3621, NGC 3521 and DDO 154 are well fitted by MOND using expected values of the distance and M/L. NGC 2403 required a moderately larger M/L than expected and NGC 2903 required a substantially larger value. The surprising result was that the scaleheight of the dominant baryonic component was well constrained by the rotation curves: the gas scaleheight for DDO 154 and the stellar scaleheight for the others. In fact, if the suggested stellar scaleheight (onefifth the stellar scalelength) was used in the case of NGC 3621 and NGC 3521 it would not be possible to produce a good fit to the inner rotation curve. For each of the four stellar dominated galaxies, we calculated the vertical velocity dispersions which we found to be, on the whole, quite typical compared with observed stellar vertical velocity dispersions of faceon spirals. We conclude that modelling the gas scaleheights of the gasrich dwarf spiral galaxies will be vital in order to make precise conclusions about MOND.}}, author = {{Angus, GW and van der Heyden, KJ and Famaey, B and Gentile, Gianfranco and McGaugh, SS and de Blok, WJG}}, issn = {{00358711}}, journal = {{MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY}}, keywords = {{galaxies: photometry,galaxies: kinematics and dynamics,galaxies: spiral,cosmology: dark matter,MODIFIED NEWTONIAN DYNAMICS,MODIFIED GRAVITY,SPIRAL GALAXIES,DISC GALAXIES,DDO 154,IC 2574,MOND,MASS,SIMULATIONS,STABILITY}}, language = {{eng}}, number = {{3}}, pages = {{25982609}}, title = {{A QUMOND galactic Nbody code, I : Poisson solver and rotation curve fitting}}, url = {{http://dx.doi.org/10.1111/j.13652966.2012.20532.x}}, volume = {{421}}, year = {{2012}}, }
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