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We present the mass models of 31 spiral and irregular nearby galaxiesobtained using hybrid rotation curves (RCs) combining high resolution GHASPFabry-Perot H$\alpha$ RCs and extended WHISP HI ones together with 3.4 $\mu$mWISE photometry. The aim is to compare the dark matter (DM) halo propertieswithin the optical radius using only H$\alpha$ RCs with the effect of includingand excluding the mass contribution of the neutral gas component, and whenusing HI or hybrid RCs. Pseudo-isothermal (ISO) core and Navarro-Frenk-White(NFW) cuspy DM halo profiles are used with various fiducial fitting procedures.Mass models using H$\alpha$ RCs including or excluding the HI gas componentprovide compatible disc M/L. The correlations between DM halo and baryonparameters do not strongly depend on the RC. Clearly, the differences betweenthe fitting procedures are larger than between the different datasets. Hybridand HI RCs lead to higher M/L values for both ISO and NFW best fit models butlower central densities for ISO halos and higher concentration for NFW halosthan when using H$\alpha$ RCs only. The agreement with the mass modelparameters deduced using hybrid RCs, considered as a reference, is better forHI than for H$\alpha$ RCs. ISO density profiles better fit the RCs than the NFWones, especially when using H$\alpha$ or hybrid RCs. Halo masses at the opticalradius determined using the various datasets are compatible even if they tendto be overestimated with H$\alpha$ RCs. Hybrid RCs are thus ideal to study themass distribution within the optical radius.

monthly notices of the royal astronomical society

GHASP: an H$\alpha$ kinematical survey of spiral galaxies -- XIII.  Distribution of luminous and dark matter in spiral and irregular nearby  galaxies using H$\alpha$ and HI rotation curves and WISE photometry