Mass models of disc galaxies from the DiskMass Survey in modified Newtonian dynamics

G. W. Angus, G. Gentile, R. Swaters, B. Famaey, A. Diaferio, S. S. McGaugh, K. J. Van Der Heyden

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

This article explores the agreement between the predictions of modified Newtonian dynamics (MOND) and the rotation curves and stellar velocity dispersion profiles measured by the DiskMass Survey (DMS). A bulge-disk decomposition was made for each of the thirty published galaxies, and a MOND Poisson solver was used to simultaneously compute, from the baryonicmass distributions, model rotation curves and vertical velocity dispersion profiles, which were compared to the measured values. The two main free parameters, the stellar disk's mass-to-light ratio (M/L) and its exponential scaleheight (hz), were estimated by Markov Chain Monte Carlo modelling. The average best-fitting K-band stellar mass-to-light ratio was M/L ≃ 0.55 ± 0.15. However, to match the DMS data, the vertical scaleheights would have to be in the range hz = 200-400 pc which is a factor of 2 lower than those derived from observations of edge-on galaxies with a similar scalelength. The reason is that modified gravity versions of MOND characteristically require a larger M/L to fit the rotation curve in the absence of dark matter and therefore predict a stronger vertical gravitational field than Newtonian models. It was found that changing the MOND acceleration parameter, the shape of the velocity dispersion ellipsoid, the adopted vertical distribution of stars, as well as the galaxy inclination, within any realistic range, all had little impact on these results.

Original languageEnglish
Pages (from-to)3551-3580
Number of pages30
JournalMonthly Notices of the Royal Astronomical Society
Volume451
Issue number4
DOIs
Publication statusPublished - Apr 24 2015

Fingerprint

disk galaxies
mass to light ratios
galaxies
curves
Markov chain
vertical distribution
Markov chains
profiles
extremely high frequencies
ellipsoids
stellar mass
decomposition
gravitational fields
gravity
inclination
dark matter
gravitation
prediction
stars
modeling

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Angus, G. W., Gentile, G., Swaters, R., Famaey, B., Diaferio, A., McGaugh, S. S., & Van Der Heyden, K. J. (2015). Mass models of disc galaxies from the DiskMass Survey in modified Newtonian dynamics. Monthly Notices of the Royal Astronomical Society, 451(4), 3551-3580. https://doi.org/10.1093/mnras/stv1132
Angus, G. W. ; Gentile, G. ; Swaters, R. ; Famaey, B. ; Diaferio, A. ; McGaugh, S. S. ; Van Der Heyden, K. J. / Mass models of disc galaxies from the DiskMass Survey in modified Newtonian dynamics. In: Monthly Notices of the Royal Astronomical Society. 2015 ; Vol. 451, No. 4. pp. 3551-3580.
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Angus, GW, Gentile, G, Swaters, R, Famaey, B, Diaferio, A, McGaugh, SS & Van Der Heyden, KJ 2015, 'Mass models of disc galaxies from the DiskMass Survey in modified Newtonian dynamics', Monthly Notices of the Royal Astronomical Society, vol. 451, no. 4, pp. 3551-3580. https://doi.org/10.1093/mnras/stv1132

Mass models of disc galaxies from the DiskMass Survey in modified Newtonian dynamics. / Angus, G. W.; Gentile, G.; Swaters, R.; Famaey, B.; Diaferio, A.; McGaugh, S. S.; Van Der Heyden, K. J.

In: Monthly Notices of the Royal Astronomical Society, Vol. 451, No. 4, 24.04.2015, p. 3551-3580.

Research output: Contribution to journalArticle

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AU - Angus, G. W.

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AU - Famaey, B.

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AU - McGaugh, S. S.

AU - Van Der Heyden, K. J.

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