We present an integral field spectroscopic study of the Luminous Infrared Galaxy ( LIRG ) NGC 7130 , a known starburst-AGN composite galaxy .
We employ standard emission line ratio diagnostics and maps of velocity dispersion and velocity field to investigate how the dominant ionising sources change as a function of radius .
From the signatures of both star formation and AGN activity we show that NGC 7130 is a remarkably clean case of starburst-AGN mixing .
We find a smooth transition from AGN dominated emission in the centre to pure star forming activity further out , from which we can estimate the radius of the extended narrow line region to be 1.8 \pm 0.8 kpc .
We calculate that the fraction of [ O III ] luminosity due to star formation and AGN activity is 30 \pm 2 % and 70 \pm 3 % respectively , and that the fraction of H \alpha luminosity due to star formation and AGN activity is 65 \pm 3 % and 35 \pm 2 % respectively .
We conclude with a discussion of the importance and potential of starburst-AGN mixing for future studies of the starburst-AGN connection .