Feeding versus feedback in active galactic nuclei from near-infrared integral field spectroscopy - XII. NGC 5548

We map the gas excitation and kinematics, and the stellar population properties of the Seyfert 1 galaxy NGC 5548 using Gemini Near Infrared Integral Field Spectrograph in the J and K bands at a spatial and velocity resolution of 105 pc and 45 km s(-1), respectively. Emission-line flux distributions in ionized and molecular gas extend up to approximate to 400 pc from the nucleus, where they are found to peak. The mass of H II is 4.8 +/- 0.6 x 106 M-circle dot and the mass of warm H-2 is 1.1 +/- 0.2 x 10(3) M-circle dot, while the mass of cold H-2 is estimated as 5.8 +/- 1.2 x 108 M-circle dot. The Pa beta emission shows two kinematic components: one in blueshift, with velocity reaching approximate to-300 km s(-1) and another showing a velocity field characteristic of rotation in the galaxy plane. The blueshifted component is also observed in the coronal line [S IX]lambda 1.2523 mu m, while the rotational component is also observed in the molecular gas. We interpret this velocity field as due to gas rotating in the galaxy plane plus an outflow, and estimate a mass outflow rate of 6.8 +/- 0.75 M-circle dot yr(-1). Spectral synthesis of the continuum shows nuclear emission dominated by a featureless AGN continuum combined with hot dust emission attributed to a dusty torus. The stellar population is dominated by an old (2 Gyr < t <= 15 Gyr) component between 160 and 300 pc, while closer to the nucleus, an intermediate age (50 Myr < t <= 2 Gyr) component contributes at levels ranging from approximate to 40 per cent to approximate to 100 per cent to the flux at 2.12 mu m.