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We investigate the properties of the baryonic and the dark matter componentsin low surface brightness (LSB) disc galaxies, with central surface brightnessin the B band $\mu_0 \geq 23 \, mag \, arcsec^{-2}$. The sample is composed by72 objects, whose rotation curves show an orderly trend reflecting the idea ofa universal rotation curve (URC) similar to that found in the local highsurface brightness (HSB) spirals in previous works. This curve relies on themass modelling of the coadded rotation curves, involving the contribution froman exponential stellar disc and a Burkert cored dark matter halo. We find thatthe dark matter is dominant especially within the smallest and less luminousLSB galaxies. Dark matter halos have a central surface density $\Sigma _0 \sim100 \, M_{\odot} pc^{-2}$, similar to galaxies of different Hubble types andluminosities. We find various scaling relations among the LSBs structuralproperties which turn out to be similar but not identical to what has beenfound in HSB spirals. In addition, the investigation of these objects calls forthe introduction of a new luminous parameter, the stellar compactness $C_*$(analogously to a recent work by Karukes \& Salucci), alongside with theoptical radius and the optical velocity in order to reproduce the URC.Furthermore, a mysterious entanglement between the properties of the luminousand the dark matter emerges.

The universal rotation curve of low surface brightness galaxies IV: the interrelation between dark and luminous matter