Pallavi Patil (Johns Hopkins University) - From Gas-Rich Galaxies to Quiescence at Cosmic Noon: How Radio AGN Shape Galaxy Evolution

The peak epoch of galaxy assembly (z~1-3) is a critical phase for the co-evolution of supermassive black holes and their host galaxies. During this period, radio-mode AGN feedback is expected to regulate star formation (SF) within dense environments, yet the timing, energetics, and effectiveness of young radio jets remain poorly constrained. In this talk, I will first characterize a population of ultra-luminous, heavily obscured quasars at cosmic noon. Our multi-wavelength follow-up from radio, ALMA, and optical spectroscopy reveals recently triggered jets residing in gas-rich hosts with ongoing SF, suggesting that these systems represent an early phase of jet–ISM coupling. I will then pivot to the final stages of the galaxy lifecycle to examine whether these jets could ultimately drive the rapid suppression of star formation. Using VLA deep-field observations of massive galaxies in the post-starburst phase, I will investigate the prevalence and impact of jetted AGN during quenching. Together, these results indicate that while young radio jets are common in gas-rich systems, their quenching impact may be delayed or episodic. Finally, I highlight how next-generation observational suites will allow us to resolve the energetic exchange between jets and gas, ultimately connecting black hole growth to the regulation of galaxy growth over cosmic time.

The Astronomy Colloquium covers a wide range of topics and should be accessible to advanced Astronomy Majors. Refreshments will be served from 3:45 pm with the presentation beginning at 4:00 pm.