Parkes observations for project P1023 semester 2020APRS_02

Brief description

Superradiance (SA) is a well known phenomenon of coherent emission. The first claim of detection of SA in an astronomical setting was made as late as 2016, with new claimed detections in 2019, all on ~100 days' time scale. We propose this exploratory, program to try to identify SA on much shorter time scale in three targets containing strong OH masers. Our key advantages include the unique capability of Parkes UWB in recording OH and CH lines simultaneously and our innovative scheme in calibrating flux as quickly as a fraction of a second. Our goal is to seek correlated flux variation of both OH and CH masing transitions at both short (~s) and long (~3 months) time scales and use HI as a check on the gain. It would be a major discovery if we could detect SA. Otherwise, the proposed observation will still help constrain the excitation conditions of OH an CH ?-doubling transitions, the latter of which has seen much less published masing activities.