Advanced search
1 file | 6.12 MB Add to list

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

Author
Organization
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 baryonic mass 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 (h(z)), were estimated by Markov Chain Monte Carlo modelling. The average best-fitting K-band stellar mass-to-light ratio was M/L a parts per thousand integral 0.55 +/- A 0.15. However, to match the DMS data, the vertical scaleheights would have to be in the range h(z) = 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.
Keywords
dark matter, galaxies: kinematics and dynamics, TULLY-FISHER RELATION, ON SPIRAL GALAXIES, SURFACE BRIGHTNESS GALAXIES, EXTENDED ROTATION CURVES, DARK-MATTER, GALACTIC DISKS, STELLAR MASS, 3-DIMENSIONAL DISTRIBUTION, 21-CM LINE, MILKY-WAY, methods: numerical

Downloads

  • Angus et al. 2015.pdf
    • full text
    • |
    • open access
    • |
    • PDF
    • |
    • 6.12 MB

Citation

Please use this url to cite or link to this publication:

MLA
Angus, GW et al. “Mass Models of Disc Galaxies from the DiskMass Survey in Modified Newtonian Dynamics.” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 451.4 (2015): 3551–3580. Print.
APA
Angus, G., Gentile, G., Swaters, R., Famaey, B., Diaferio, A., McGaugh, S., & van der Heyden, K. (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.
Chicago author-date
Angus, GW, Gianfranco Gentile, R Swaters, B Famaey, A Diaferio, SS McGaugh, and KJ van der Heyden. 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.
Chicago author-date (all authors)
Angus, GW, Gianfranco Gentile, R Swaters, B Famaey, A Diaferio, SS McGaugh, and KJ van der Heyden. 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.
Vancouver
1.
Angus G, Gentile G, Swaters R, Famaey B, Diaferio A, McGaugh S, et al. Mass models of disc galaxies from the DiskMass Survey in modified Newtonian dynamics. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. 2015;451(4):3551–80.
IEEE
[1]
G. Angus et al., “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, 2015.
@article{7059873,
  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 baryonic mass 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 (h(z)), were estimated by Markov Chain Monte Carlo modelling. The average best-fitting K-band stellar mass-to-light ratio was M/L a parts per thousand integral 0.55 +/- A 0.15. However, to match the DMS data, the vertical scaleheights would have to be in the range h(z) = 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.},
  author       = {Angus, GW and Gentile, Gianfranco and Swaters, R and Famaey, B and Diaferio, A and McGaugh, SS and van der Heyden, KJ},
  issn         = {0035-8711},
  journal      = {MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY},
  keywords     = {dark matter,galaxies: kinematics and dynamics,TULLY-FISHER RELATION,ON SPIRAL GALAXIES,SURFACE BRIGHTNESS GALAXIES,EXTENDED ROTATION CURVES,DARK-MATTER,GALACTIC DISKS,STELLAR MASS,3-DIMENSIONAL DISTRIBUTION,21-CM LINE,MILKY-WAY,methods: numerical},
  language     = {eng},
  number       = {4},
  pages        = {3551--3580},
  title        = {Mass models of disc galaxies from the DiskMass Survey in modified Newtonian dynamics},
  url          = {http://dx.doi.org/10.1093/mnras/stv1132},
  volume       = {451},
  year         = {2015},
}

Altmetric
View in Altmetric
Web of Science
Times cited: