The Fornax3D project: Planetary nebulae catalogue and independent
  distance measurements to Fornax cluster galaxies
  Extragalactic planetary nebulae (PNe) offer a way to determine the distance
to their host galaxies thanks to the nearly universal shape of the planetary
nebulae luminosity function (PNLF). Accurate PNe distance measurements rely on
obtaining well-sampled PNLFs and the number of observed PNe scales with the
encompassed stellar mass. This means either disposing of wide-field
observations or focusing on the bright central regions of galaxies. In this
work we take this second approach and conduct a census of the PNe population in
the central regions of galaxies in the Fornax cluster, using VLT/MUSE data for
the early-type galaxies observed over the course of the Fornax3D survey. Using
such integral-field spectroscopic observations to carefully separate the
nebular emission from the stellar continuum, we isolated [OIII] 5007 {\AA}
sources of interest, filtered out unresolved impostor sources or kinematic
outliers, and present a catalogue of 1350 unique PNe sources across 21
early-type galaxies, which includes their positions, [OIII] 5007 {\AA} line
magnitudes, and line-of-sight velocities. Using the PNe catalogued within each
galaxy, we present independently derived distance estimates based on the fit to
the entire observed PNLF observed while carefully accounting for the PNe
detection incompleteness. With these individual measurements, we arrive at an
average distance to the Fornax cluster itself of 19.86 $\pm$ 0.32 Mpc
($\mu_{PNLF}$ = 31.49 $\pm$ 0.04 mag). Our PNLF distance measurements agree
well with previous distances based on surface brightness fluctuations, finding
no significant systematic offsets between the two methods as otherwise reported
in previous studies.
