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A QUMOND galactic N-body code, I: Poisson solver and rotation curve fitting

GW Angus, KJ van der Heyden, B Famaey, Gianfranco Gentile UGent, SS McGaugh and WJG de Blok (2012) MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. 421(3). p.2598-2609
abstract
Here we present a new particle-mesh galactic N-body code that uses the full multigrid algorithm for solving the modified Poisson equation of the quasi-linear 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 N-body realizations of the galaxies according to their stellar and gaseous surface densities and allowed their distances, mass-to-light ratios (M/L values) and both the stellar and gas scale-heights to vary in order to estimate the best-fitting 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 scale-height of the dominant baryonic component was well constrained by the rotation curves: the gas scale-height for DDO 154 and the stellar scale-height for the others. In fact, if the suggested stellar scale-height (one-fifth the stellar scale-length) 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 face-on spirals. We conclude that modelling the gas scale-heights of the gas-rich dwarf spiral galaxies will be vital in order to make precise conclusions about MOND.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
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
journal title
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Mon. Not. Roy. Astron. Soc.
volume
421
issue
3
pages
2598 - 2609
Web of Science type
Article
Web of Science id
000302620500058
JCR category
ASTRONOMY & ASTROPHYSICS
JCR impact factor
5.521 (2012)
JCR rank
9/56 (2012)
JCR quartile
1 (2012)
ISSN
0035-8711
DOI
10.1111/j.1365-2966.2012.20532.x
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
2918537
handle
http://hdl.handle.net/1854/LU-2918537
date created
2012-06-25 15:00:57
date last changed
2012-11-02 00:30:48
@article{2918537,
  abstract     = {Here we present a new particle-mesh galactic N-body code that uses the full multigrid algorithm for solving the modified Poisson equation of the quasi-linear 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 N-body realizations of the galaxies according to their stellar and gaseous surface densities and allowed their distances, mass-to-light ratios (M/L values) and both the stellar and gas scale-heights to vary in order to estimate the best-fitting 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 scale-height of the dominant baryonic component was well constrained by the rotation curves: the gas scale-height for DDO 154 and the stellar scale-height for the others. In fact, if the suggested stellar scale-height (one-fifth the stellar scale-length) 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 face-on spirals. We conclude that modelling the gas scale-heights of the gas-rich 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         = {0035-8711},
  journal      = {MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY},
  keyword      = {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        = {2598--2609},
  title        = {A QUMOND galactic N-body code, I: Poisson solver and rotation curve fitting},
  url          = {http://dx.doi.org/10.1111/j.1365-2966.2012.20532.x},
  volume       = {421},
  year         = {2012},
}

Chicago
Angus, GW, KJ van der Heyden, B Famaey, Gianfranco Gentile, SS McGaugh, and WJG de Blok. 2012. “A QUMOND Galactic N-body Code, I: Poisson Solver and Rotation Curve Fitting.” Monthly Notices of the Royal Astronomical Society 421 (3): 2598–2609.
APA
Angus, G., van der Heyden, K., Famaey, B., Gentile, G., McGaugh, S., & de Blok, W. (2012). A QUMOND galactic N-body code, I: Poisson solver and rotation curve fitting. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 421(3), 2598–2609.
Vancouver
1.
Angus G, van der Heyden K, Famaey B, Gentile G, McGaugh S, de Blok W. A QUMOND galactic N-body code, I: Poisson solver and rotation curve fitting. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. 2012;421(3):2598–609.
MLA
Angus, GW, KJ van der Heyden, B Famaey, et al. “A QUMOND Galactic N-body Code, I: Poisson Solver and Rotation Curve Fitting.” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 421.3 (2012): 2598–2609. Print.