  Accurate active galactic nucleus (AGN) identifications in large galaxy
samples are crucial to assess the role of AGN and AGN feedback in the
coevolution of galaxies and their central supermassive black holes. Emission
line flux ratio diagnostics are the most common technique for identifying AGN
in optical spectra. New large samples of integral field unit observations allow
The exploration of the role of aperture size used for the classification. In
this paper, we present galaxy classifications for all 10,010 galaxies observed
within the Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey.
We use Baldwin-Philips-Terlevich line flux ratio diagnostics combined with an
H$\alpha$ equivalent threshold in 60 apertures of varying size for the
classification and provide the corresponding catalogs. MaNGA-selected AGN
primarily lie below the main sequence of star-forming galaxies, reside with
massive galaxies with stellar masses of $\sim 10^{11}$~M$_{\odot}$ and a median
H$\alpha$-derived star formation rate of $\sim 1.44$M$_{\odot}$~yr$^{-1}$. We
find that the number of `fake' AGN increases significantly beyond selection
apertures of $>$~1.0~R$_{eff}$ due to increased contamination from diffuse
ionized gas (DIG). A comparison with previous works shows that the treatment of
the underlying stellar continuum and flux measurements can significantly impact
galaxy classification. Our work provides the community with AGN catalogs and
galaxy classifications for the full MaNGA.
