Spatially resolved star formation and metallicity profiles in
  post-merger galaxies from MaNGA
  Large galaxy surveys have demonstrated that galaxy-galaxy mergers can
dramatically change the morphologies, star formation rates (SFRs) and
metallicities of their constituents. However, most statistical studies have
been limited to the measurement of global quantities, through large fibres or
integrated colours. In this work, we present the first statistically
significant study of spatially resolved star formation and metallicity profiles
using integral field spectroscopy, using a sample of $\sim$20,000 spaxels in 36
visually selected post-merger galaxies from the Mapping Nearby Galaxies with
Apache Point Observatory (MaNGA) survey. By measuring offsets from SFR and
metallicity scaling relations on a spaxel-by-spaxel basis, we are able to
quantify where in the galaxy these properties are most affected by the
interaction. We find that the SFR enhancements are generally centrally peaked,
by a factor of 2.5 on average, in agreement with predictions from simulations.
However, there is considerable variation in the SFR behaviour in the galactic
outskirts, where both enhancement and suppression are seen. The median SFR
remains enhanced by 0.1 dex out to at least 1.9 $R_{e}$. The metallicity is
also affected out to these large radii, typically showing a suppression of
$\sim$-0.04dex.
