Implications on star-formation-rate indicators from HII regions and diffuse ionised gas in the M101 Group

A. E. Watkins, J. C. Mihos, P. Harding +1

We examine the connection between diffuse ionised gas (DIG), HII regions, and field O and B stars in the nearby spiral M101 and its dwarf companion NGC 5474 using ultra-deep H$\alpha$ n…