GHASP: an Hα kinematic survey of spiral and irregular galaxies – V. Dark matter distribution in 36 nearby spiral galaxies
By S. M., M. M., P. Amram, C. C., E. B, Hernandez O. 2007
175 citations recorded by the source corpus.
The results obtained from a study of the mass distribution of 36 spiral galaxies are presented. The galaxies were observed using Fabry-Perot interferometry as part of the GHASP survey. The main aim of obtaining high resolution H alpha 2D velocity fields is to define more accurately the rising part of the rotation curves which should allow to better constrain the parameters of the mass distribution. The H alpha velocities were combined with low resolution HI data from the literature, when available. Combining the kinematical data with photometric data, mass models were derived from these rotation curves using two different functional forms for the halo: an isothermal sphere and an NFW profile. For the galaxies already modeled by other authors, the results tend to agree. Our results point at the existence of a constant density core in the center of the dark matter halos rather than a cuspy core, whatever the type of the galaxy from Sab to Im. This extends to all types the result already obtained by other authors studying dwarf and LSB galaxies but would necessitate a larger sample of galaxies to conclude more strongly. Whatever model is used (ISO or NFW), small core radius halos have higher central densities, again for all morphological types. We confirm different halo scaling laws, such as the correlations between the core radius and the central density of the halo with the absolute magnitude of a galaxy: low luminosity galaxies have small core radius and high central density. We find that the product of the central density with the core radius of the dark matter halo is nearly constant, whatever the model and whatever the absolute magnitude of the galaxy. This suggests that the halo surface density is independent from the galaxy type.
Subfields: Astronomy and Astrophysics
View Paper: https://www.semanticscholar.org/paper/87077335fe9028737f87535c6a69702644da0009
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In Astronomy and Astrophysics
Citations in the corpus
- GHASP: an Hα kinematic survey of spiral and irregular galaxies - VI. New Hα data cubes for 108 galaxies (2008, background): “This paper is the sixth of a series called hereafter Paper I to V (Garrido et al. 2002, 2003, 2004, 2005; Spano et al. 2007) presenting the data obtained in the frame of the GHASP survey.”
- Hidden charged dark matter (2009, background): “The status of these discrepancies is unclear — while it seems clear that the census of the observed local group galaxies are broadly in agreement with the cold dark matter model [90, 91], the fit to rotation curves of low-surface brightness galaxies is still problematic [92–96].”