Swift/UVOT+MaNGA (SwiM) Value-added Catalog
  We introduce the Swift/UVOT+MaNGA (SwiM) value added catalog, which comprises
150 galaxies that have both SDSS/MaNGA integral field spectroscopy and archival
Swift/UVOT near-UV (NUV) images. The similar angular resolution between the
three Swift/UVOT NUV images and the MaNGA maps allows for a high-resolution
comparison of optical and NUV indicators of star formation, crucial for
constraining quenching and attenuation in the local universe. The UVOT NUV
images, SDSS images, and MaNGA emission line and spectral index maps have all
been spatially matched and re-projected to match the point spread function and
pixel sampling of the Swift/UVOT uvw2 images, and are presented in the same
coordinate system for each galaxy. The spectral index maps use the definition
first adopted by Burstein et al. (1984), which makes it more convenient for
users to compute spectral indices when binning the maps. Spatial covariance is
properly taken into account in propagating the uncertainties. We also provide a
catalog that includes PSF-matched aperture photometry in the SDSS optical and
Swift NUV bands. In an earlier, companion paper (Molina et al. 2020) we used a
subset of these galaxies to explore the attenuation laws of kiloparsec-sized
star forming regions. The catalog, maps for each galaxy, and the associated
data models, are publicly released on the SDSS website
(https://data.sdss.org/sas/dr16/manga/swim/v3.1/).
