Diagnostics of a nuclear starburst: water and methanol masers

We test models of starburst driven outflows using observations of the 22.2 GHz H₂O and 36.2 GHz class I CH₃OH maser lines. We have observed the starburst galaxy NGC 253 using the Karl G. Jansky Very Large Array. We present evidence for entrainment of star-forming dense-molecular gas in the outflow of NGC 253. We also show that H₂O masers are associated with forming super star clusters and not with supernova remnants. We detect four new 36 GHz CH₃OH masers in the central kpc and show possible evidence for a star-formation origin of two class I CH₃OH masers. Such high resolution observations are essential for understanding the origin of these masers.