The dynamics of the bulge dominated galaxy NGC 7814 in MOND

G. W. Angus, K. J. Van Der Heyden, A. Diaferio

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Context. The bulge dominated galaxy NGC 7814 provides one of the strongest dynamical tests possible for MOdified Newtonian Dynamics (MOND). Spitzer 3.6 μm photometry fixes the bulge parameterisation and strongly constrains the properties of the subdominant stellar disk. Furthermore, the distance is known to better than 5%, virtually eliminating it as a free parameter. The rotation curve is easily measured, since the H I (and stellar) disks are edge on, and both the receding and approaching sides agree very well. Aims. We explore the agreement between the model and observed rotation curves in MOND given that the only two free parameters available are the mass-to-light ratios of the bulge and disk. Methods. We use a grid based MOND Poisson solver that accurately solves for the MOND gravity and produces our model rotation curves from a given mass distribtion. The input to the Poisson solver is a 3D distribution of N particles which is generated from modelling the observed distribution of stars and gas in the galaxy. Results. By ensuring a superior fit to the radial surface brightness profile than previous works, by virtue of a double Sérsic fit to the bulge, we were able to produce excellent fits to the rotation curve with typical values for both mass-to-light ratios. Conclusions. The model rotation curve of a mass distribution in MOND is extremely sensitive to the bulge-disk decomposition and even slight deviation from the observed mass distribution can produce large differences in the model rotation curve.

Original languageEnglish
Article numberA76
JournalAstronomy and Astrophysics
Volume543
DOIs
Publication statusPublished - 2012

Fingerprint

galaxies
curves
mass to light ratios
mass distribution
parameterization
fixing
photometry
brightness
grids
decomposition
gravity
gravitation
deviation
stars
distribution
profiles
gases
gas
modeling
parameter

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Angus, G. W. ; Van Der Heyden, K. J. ; Diaferio, A. / The dynamics of the bulge dominated galaxy NGC 7814 in MOND. In: Astronomy and Astrophysics. 2012 ; Vol. 543.
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abstract = "Context. The bulge dominated galaxy NGC 7814 provides one of the strongest dynamical tests possible for MOdified Newtonian Dynamics (MOND). Spitzer 3.6 μm photometry fixes the bulge parameterisation and strongly constrains the properties of the subdominant stellar disk. Furthermore, the distance is known to better than 5{\%}, virtually eliminating it as a free parameter. The rotation curve is easily measured, since the H I (and stellar) disks are edge on, and both the receding and approaching sides agree very well. Aims. We explore the agreement between the model and observed rotation curves in MOND given that the only two free parameters available are the mass-to-light ratios of the bulge and disk. Methods. We use a grid based MOND Poisson solver that accurately solves for the MOND gravity and produces our model rotation curves from a given mass distribtion. The input to the Poisson solver is a 3D distribution of N particles which is generated from modelling the observed distribution of stars and gas in the galaxy. Results. By ensuring a superior fit to the radial surface brightness profile than previous works, by virtue of a double S{\'e}rsic fit to the bulge, we were able to produce excellent fits to the rotation curve with typical values for both mass-to-light ratios. Conclusions. The model rotation curve of a mass distribution in MOND is extremely sensitive to the bulge-disk decomposition and even slight deviation from the observed mass distribution can produce large differences in the model rotation curve.",
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The dynamics of the bulge dominated galaxy NGC 7814 in MOND. / Angus, G. W.; Van Der Heyden, K. J.; Diaferio, A.

In: Astronomy and Astrophysics, Vol. 543, A76, 2012.

Research output: Contribution to journalArticle

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