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We provide new planetary nebula luminosity function (PNLF) distances to 19nearby spiral galaxies that were observed with VLT/MUSE by the PHANGScollaboration. Emission line ratios are used to separate planetary nebulae(PNe) from other bright [OIII] emitting sources like compact supernovaeremnants (SNRs) or HII regions. While many studies have used narrowband imagingfor this purpose, the detailed spectral line information provided by integralfield unit (IFU) spectroscopy grants a more robust way of categorisingdifferent [OIII] emitters. We investigate the effects of SNR contamination onthe PNLF and find that we would fail to classify all objects correctly, whenlimited to the same data narrowband imaging provides. However, the fewmisclassified objects usually do not fall on the bright end of the luminosityfunction, and only in three cases does the distance change by more than$1\sigma$. We find generally good agreement with literature values from othermethods. Using metallicity constraints that have also been derived from thesame IFU data, we revisit the PNLF zero point calibration. Over a range of$8.34 < 12 + \log(\mathrm{O}/\mathrm{H}) < 8.59$, our sample is consistent witha constant zero point and yields $M^*=-4.542^{+0.103}_{-0.059}\, \mathrm{mag}$,within $1\sigma$ of other literature values. MUSE pushes the limits of PNLFstudies and makes galaxies beyond $20\, \mathrm{Mpc}$ accessible for this kindof analysis. This approach to the PNLF shows great promise for leveragingexisting archival IFU data on nearby galaxies.

Planetary Nebula Luminosity Function distances for 19 galaxies observed by PHANGS-MUSE