Comparative testing of dark matter models with 15 HSB and 15 LSB galaxies
arXiv:1604.02465 · doi:10.1051/0004-6361/201628668
Abstract
We assemble a database of 15 HSB and 15 LSB galaxies, for which surface brightness density and spectroscopic rotation curve data are both available and representative for various morphologies. We use this dataset to test the Navarro-Frenk-White, the Einasto, and the pseudo-isothermal sphere dark matter (DM) models. We investigate the compatibility of the pure baryonic model and baryonic plus one of the three DM models with observations on the assembled galaxy database. When a DM component improves the fit with the spectroscopic rotational curve, we rank the models according to the goodness of fit to the datasets. We constructed the spatial luminosity density of the baryonic component based on the surface brightness profile of the galaxies. We estimated the mass-to-light (M/L) ratio of the stellar component through a previously proposed color-mass-to-light ratio relation (CMLR). We assumed an axissymetric baryonic mass model with variable axis ratios together with one of the three DM models to provide the theoretical rotational velocity curves, and we compared them with the dataset. In a second attempt, we addressed the question whether the dark component could be replaced by a pure baryonic model with fitted M/L ratios. We employed the Akaike information criterion (AIC) to establish the performance of the best-fit models. For 7 galaxies, neither model fits the dataset within the 1σ confidence level. For the other 23 cases, one of the models with DM explains the rotation curve data best. According to the AIC, the PSE emerges as most favored in 14 cases, followed by the NFW (6 cases) and the Einasto (3 cases) DM models. We find that the pure baryonic model with fitted M/L ratios falls within the 1σ confidence level for 10 HSB and 2 LSB galaxies, at the price of growing the M/Ls on average by a factor of two, but the fits are inferior compared to the best-fitting DM model.
14 pages, 5 figures, 8 tables. Accepted to publish in A&A
References in corpus (11)
- Planck 2015 results. XIII. Cosmological parameters
- Overview of the SDSS-IV MaNGA Survey: Mapping Nearby Galaxies at Apache Point Observatory
- Color--Mass-to-Light Ratio Relations for Disk Galaxies
- The long bar as seen by the VVV survey: I. Colour-magnitude diagrams
- The DiskMass Survey. VII. The distribution of luminous and dark matter in spiral galaxies
- The SAMI Galaxy Survey: Early Data Release
- Analytical properties of Einasto dark matter haloes
- A First Attempt to Calibrate the Baryonic Tully-Fisher Relation with Gas Dominated Galaxies
- Line-of-sight velocity dispersions and a mass distribution model of the Sa galaxy NGC 4594
- Stellar Populations and the Star Formation Histories of LSB Galaxies: IV Spitzer Surface Photometry of LSB Galaxies
- Structure of visible and dark matter components in spiral galaxies at redshifts z = 0.5-0.9