Milgrom Relation Models for Spiral Galaxies from Two-Dimensional Velocity Maps
arXiv:astro-ph/0701535 · doi:10.1086/512188
Abstract
Using two-dimensional velocity maps and I-band photometry, we have created mass models of 40 spiral galaxies using the Milgrom relation (the basis of modified Newtonian dynamics, or MOND) to complement previous work. A Bayesian technique is employed to compare several different dark matter halo models to Milgrom and Newtonian models. Pseudo-isothermal dark matter halos provide the best statistical fits to the data in a majority of cases, while the Milgrom relation generally provides good fits as well. We also find that Milgrom models give mass-to-light ratios that roughly correlate with galaxy color, as predicted by stellar population models. A subsample of galaxies in the Hydra cluster follow a tight relation between mass-to-light and color, but one that is significantly different from relations found in previous studies. Ruling out the Milgrom relation with rotational kinematics is difficult due to systematic uncertainties in the observations as well as underlying model assumptions. We discuss in detail two galaxies for which the Milgrom relation appears to fail and find that relaxing the assumption of constant stellar mass-to-light ratio can maintain Milgrom models' viability.
accepted for publication in The Astronomical Journal; 17 pages
References in corpus (26)
- Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
- The Structure of Cold Dark Matter Halos
- A direct empirical proof of the existence of dark matter
- The Optical and Near-Infrared Properties of Galaxies: I. Luminosity and Stellar Mass Functions
- Stellar mass-to-light ratios and the Tully-Fisher relation
- The Baryonic Tully-Fisher Relation
- Modified Newtonian Dynamics as an Alternative to Dark Matter
- The cored distribution of dark matter in spiral galaxies
- The Baryonic Tully-Fisher Relation of Galaxies with Extended Rotation Curves and the Stellar Mass of Rotating Galaxies
- How many cosmological parameters?
- Strong and weak lensing united III: Measuring the mass distribution of the merging galaxy cluster 1E0657-56
- Global Extinction in Spiral Galaxies
- The Mass Discrepancy-Acceleration Relation: Disk Mass and the Dark Matter Distribution
- The published extended rotation curves of spiral galaxies: Confrontation with Modified Dynamics
- On the Proof of Dark Matter, the Law of Gravity and the Mass of Neutrinos
- The Tully-Fisher relation for low surface brightness galaxies - implications for galaxy evolution
- The Disk and Dark Halo Mass of the Barred Galaxy NGC 4123. II. Fluid-Dynamical Models
- II: Bayesian Methods for Cosmological Parameter Estimation from Cosmic Microwave Background Measurements
- Testing Modified Newtonian Dynamics with Low Surface Brightness Galaxies --Rotation curve fits-
- Rotation curves of UMa galaxies in the context of modified Newtonian dynamics
- Accurate Determination of the Mass Distribution in Spiral Galaxies: II. Testing the Shape of Dark Halos
- Maximum Disk Mass Models for Spiral Galaxies
- Template Rotation Curves for Disk Galaxies
- Galaxy clusters in the Perseus-Pisces region - II. The peculiar velocity field
- Uncertainties in Spiral Galaxy Projection Parameters
- Mass Models for Spiral Galaxies from 2-D Velocity Maps