Multi-resolution filtering: an empirical method for isolating faint, extended emission in Dragonfly data and other low resolution images

Understand

We describe an empirical, self-contained method to isolate faint, large-scale emission in imaging data of low spatial resolution.

• Multi-resolution filtering (MRF) uses independent data of superior spatial resolution and point source depth to create a model for all compact and high surface brightness objects in the field.
• This model is convolved with an appropriate kernel and subtracted from the low resolution image.
• The halos of bright stars are removed in a separate step and artifacts are masked.