Mass content of UGC 6446 and UGC 7524 through HI rotation curves: deriving the stellar discs from stellar population synthesis models
arXiv:1703.08096 · doi:10.1093/mnras/stx447
Abstract
In this work we study the mass distribution of two irregular galaxies, UGC 6446 and UGC 7524, by means of HI rotation curves derived from high resolution HI velocity fields obtained through the Westerbork Synthesis Radio Telescope data archive. We constrain the stellar and gas content of both galaxies with stellar population synthesis models and by deriving the HI+He+metals rotation curves from the total HI surface density maps, respectively. The discrepancy between the circular velocity maxima of the stellar plus the HI+He+metals rotation curves and the observed HI rotation curves of both galaxies requires the inclusion of a substantial amount of dark matter. We explore the Navarro Frenk and White, Burkert, Di Cintio, Einasto and Stadel dark matter halo models. We obtain acceptable fits to the observed HI rotation curves of UGC 6446 and UGC 7524 with the cored Burkert, Einasto and Stadel dark matter halos. In particular, Einasto and Stadel models prove to be an appropriate alternative to the Burkert dark matter halo. This result should increase the empirical basis that justify the usage of dark matter exponential models to adjust the observed rotation curves of real galaxies.
18 pages, 16 figures, published in Monthly Notices of the Royal Astronomical Society, Main Journal
References in corpus (22)
- The propagation of uncertainties in stellar population synthesis modeling I: The relevance of uncertain aspects of stellar evolution and the IMF to the derived physical properties of galaxies
- UV Star Formation Rates in the Local Universe
- A simple model to interpret the ultraviolet, optical and infrared emission from galaxies
- HyperLEDA. III. The catalogue of extragalactic distances
- The effect of massive binaries on stellar populations and supernova progenitors
- The Sloan Digital Sky Survey-II Supernova Survey: Technical Summary
- The Local Dark Matter Density
- Evolution of asymptotic giant branch stars I. Updated synthetic TP-AGB models and their basic calibration
- Evidence for TP-AGB stars in high redshift galaxies, and their effect on deriving stellar population parameters
- On the mass-to-light ratio of the local Galactic disc and the optical luminosity of the Galaxy
- A mass-dependent density profile for dark matter haloes including the influence of galaxy formation
- Systematic Uncertainties in Stellar Mass Estimation for Distinct Galaxy Populations
- Early flattening of dark matter cusps in dwarf spheroidal galaxies
- Missing Stellar Mass in SED Fitting: Spatially Unresolved Photometry can Underestimate Galaxy Masses
- Catalog of Visually Classified Galaxies in the Local () Universe
- Inclusion of Binaries in Evolutionary Population Synthesis
- Spatial and Kinematical Lopsidedness of Atomic Hydrogen in the Ursa Major Group of Galaxies
- On the recovery of galaxy properties from SED fitting solutions
- Bulge-Disk Decompositions and Structural Bimodality of Ursa Major Cluster Spiral Galaxies
- Removing biases in resolved stellar mass-maps of galaxy disks through successive Bayesian marginalization
- Disk Mass-to-Light ratio distribution from stellar population synthesis: Application to rotation curve decomposition of NGC 5278 (KPG 390A)
- Outer and inner mass distributions of the irregular galaxies UGC 4284 and UGC 11861: Constraining the baryonic content through stellar population synthesis studies