We present positions , kinematics , and the planetary nebula luminosity function ( PNLF ) for 35 planetary nebulae ( PNe ) in the nearest starburst galaxy IC10 extending out to 3 kpc from the galaxy ’ s centre .
We take advantage of the deep imaging and spectroscopic capabilities provided by the spectrograph FOCAS on the 8.2m Subaru telescope .
The PN velocities were measured through the slitless-spectroscopy technique , which allows us to explore the kinematics of IC10 with high precision .
Using these velocities , we conclude that there is a kinematic connection between the H i envelope located around IC10 and the galaxy ’ s PN population .
By assuming that the PNe in the central regions and in the outskirts have similar ages , our results put strong observational constraints on the past tidal interactions in the Local Group .
This is so because by dating the PN central stars , we , therefore , infer the epoch of a major episode of star formation likely linked to the first encounter of the H i extended envelope with the galaxy .
Our deep [ O iii ] images also allow us to use the PNLF to estimate a distance modulus of 24.1 \pm 0.25 , which is in agreement with recent results in the literature based on other techniques .