Episode Details

Megan Masterson presented research on tidal disruption events (TDEs) observed using the James Webb Space Telescope, which has revealed previously dormant black holes becoming active and providing insights into their environmental effects. The discussion covered the physics of TDEs, including their impact on surrounding gas and dust, as well as the challenges of studying dormant black holes and their relationship with galaxy size. The conversation concluded with a discussion about the limitations of current telescopes, the importance of time-domain astronomy, and the potential impact of the Golden Dome project on the space industry.

Megan, a graduate student at MIT's Kavli Institute for Astrophysics and Space Research, discussed the discovery of tidal disruption events (TDEs) using data from the James Webb Space Telescope. These events occur when a star is torn apart by a supermassive black hole's tidal forces, producing a temporary flare of emission as the material is consumed. The James Webb Space Telescope's ability to detect these events in the infrared band has revealed previously dormant black holes becoming active, providing insights into the effects of these events on the surrounding environment. Megan spent the first part of the program explaining this subject and the fact that JWST had actually confirmed a long standing theory.

David asked Megan about the real time today effects of TDEs from 130 million light years away. Megan explained that intense radiation from matter being dumped onto black holes would strip electrons from atoms, ionizing gas and blowing dust to shreds, creating a cavity with little dust and hot ionized gas. She described this as a cocoon or shell of hot dust that the James Webb Space Telescope observes. John also inquired about dormant black holes, something Megan clarified that they are not actively accreting material from their surroundings. Megan explained how most blackholes are studied through accretion, noting that dormant black holes are challenging to observe. She discussed the correlation between galaxy size and black hole mass, suggesting a symbiotic relationship between them. She also touched on the James Webb Space Telescope's role in studying black hole growth and the mysteries surrounding their formation and dormancy.

John mentioned a new paper on black holes with Megan Masterson, highlighting the surprising rapid timescales of their activity despite expectations of PhD-level timescales. M mentioned working with a team including Kara, Christina Ellis, and Kisha Dean from California University, along with collaborators from other institutions. John went on to announce that in the second part of the program Megan would be given an unlimited budget to make the next best decision following this discovery. Megan told us what she would with such an unlimited budget.

Megan discussed the limitations of the James Webb Space Telescope's field of view and the need for multiple missions to survey the sky in different wavelength bands, particularly in X-rays. She emphasized the importance of time-domain astronomy for understanding astrophysical phenomena and black hole growth. She also touched on the potential impact of the Golden Dome project on the space industry and defense stocks, noting that while some are optimistic about the funding it could provide, others are skeptical about cost overruns.

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Special thanks to our sponsors:Northrup Grumman, American Institute of Aeronautics and Astronautics, Helix Space in Luxembourg, Celestis Memorial Spaceflights, Astrox Corporation, Dr. Haym Benaroya