CHANG-ES XX. High Resolution Radio Continuum Images of Edge-on Galaxies
  and their AGNs -- Data Release 3
  The CHANG-ES galaxy sample consists of 35 nearby edge-on galaxies that have
been observed using the VLA at 1.6 GHz and 6.0 GHz. Here we present the 3rd
data release of our sample, namely the B-configuration 1.6 GHz sample. In
addition, we make available the {\it band-to-band} spectral index maps between
1.6 GHz and 6.0 GHz, the latter taken in the matching resolution
C-configuration. The images can be downloaded from
https://www.queensu.ca/changes. These are our highest resolution images
($\approx$ 3 arcsec) and we examine the possible presence of low luminosity
active galactic nuclei in the sample as well as some in-disk structure. New
features can be seen in the spectral index maps that are masked in the total
intensity emission, including hidden spiral arms in NGC~3448 and two previously
unknown radio lobes on either side of the nucleus of NGC~3628. Our AGN
detection rate, using only radio criteria, is 55\% which we take as a lower
limit because some weaker embedded AGNs are likely present which could be
revealed at higher resolution. Archival XMM-Newton data were used to search for
further fingerprints of the AGNs in the studied sample. In galaxy disks,
discrete regions of flat spectral index are seen, likely due to a thermal
emission fraction that is higher than the global average.
