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We present a study of the excitation conditions and metallicity of ionizedgas (Z_gas) in eight nearby barred and unbarred spiral galaxies from theVIRUS-P Exploration of Nearby Galaxies (VENGA) survey, which provides highspatial sampling and resolution (median ~ 387 pc), large coverage from thebulge to outer disc, broad wavelength range (3600-6800 Ang.), and mediumspectral resolution (~ 120 km s^-1 at 5000 Ang.). Our results are: (1) Wepresent high resolution gas excitation maps to differentiate between regionswith excitation typical of Seyfert, LINER, or recent star formation. We findLINER-type excitation at large distances (3-10 kpc) from the centre, andassociate this excitation with diffuse ionized gas (DIG). (2) After excludingspaxels dominated by Seyfert, LINER, or DIG, we produce maps with the bestspatial resolution and sampling to date of the ionization parameter q, starformation rate, and Z_gas using common strong line diagnostics. We find thatisolated barred and unbarred spirals exhibit similarly shallow Z_gas profilesfrom the inner kpc out to large radii (7-10 kpc or 0.5-1.0 R_25). This impliesthat if profiles had steeper gradients at earlier epochs, then the present-daybar is not the primary driver flattening gradients over time. This resultcontradicts earlier claims, but agrees with recent IFU studies. (3) The Z_gasgradients in our z ~ 0 massive spirals are markedly shallower, by ~ 0.2 dexkpc^-1, than published gradients for lensed lower mass galaxies at z ~ 1.5-2.0.Cosmologically-motivated hydrodynamical simulations best match this inferredevolution, but the match is sensitive to adopted stellar feedbackprescriptions.

The VIRUS-P Exploration of Nearby Galaxies (VENGA): Spatially Resolved Gas-Phase Metallicity Distributions in Barred and Unbarred Spirals