Star Formation, Stellar Feedback, and the Ecology of Galaxies

Star Formation, Stellar Feedback, and the Ecology of Galaxies

Estimating the Star Formation Rate in Galactic Centre Cloud E/F using JWST Imaging

The Central Molecular Zone (CMZ) is the most extreme star-forming region in the Milky Way. The pressures, gas densities, magnetic fields, and temperatures are orders of magnitudes higher than in local star-forming regions, making star formation in the CMZ more similar to that of the early Universe than the present day Solar neighbourhood. Additionally, due to its proximity, the CMZ is the only such extreme environment where detecting young stars and resolving gas on protostellar scales is possible. In spite of the large amount of dense molecular gas in the CMZ that is available for star formation, the overall star formation rate (SFR) in this region is an order of magnitude lower than expected from Milky Way cloud scaling relations. I have used JWST NIRCam and MIRI imaging to study cloud E/F; an extremely massive and compact giant molecular cloud in the CMZ that has strong signs of early star formation. JWST can detect young stellar objects (YSOs) at this distance down to ~0.1 Lsun, and by counting the number of YSOs in the cloud, we can put the most robust estimates to date on the SFR in this region. I present the results of our YSO study of the cloud, including a discussion of the completeness of our sample due to the high column densities present in the Galactic Centre, and will conclude with an overview of our proposed follow-on studies.