Astrophysics Colloquium

KIPAC co-hosts the Astrophysics Colloquium, held both at campus and SLAC at 11 a.m. on Thursdays.  The location can be found on our events calendar.  All interested parties are welcome to attend, and food is served.  

Please contact Becky CanningAri Cukierman, Daniel Gruen and Greg Madejski for more information.

TBD

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Location

SLAC, Kavli 3rd Floor Conf. Room

Speaker
Samaya Nissanke (University of Amsterdam)

TBD

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Location

Campus, PAB 102/103

Speaker
Jason Dexter (University of Colorado at Boulder)

Ergomagnetospheres Ejection Disks and Electromagnetic Jets

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Speaker
Roger Blandford (KIPAC) via zoom

Recent, remarkable images, made by the EHT collaboration of M 87, exhibit a ring of emission, presumably orbiting a six billion solar mass black hole. It is proposed that what is observed is not an ion pressure-supported torus, but an extensive "ergomagnetosphere" that connects mechanically to a much larger "ejection disk'', through a "magnetic clutch". It is conjectured that this clutch sustains instabilities that transport energy and angular momentum outward as well as upward.

Near-Field Cosmology with Stellar Abundances

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Location

Campus, PAB 102/103

Speaker
Alexander Ji (Carnegie)

The first stars and galaxies fundamentally transformed the universe. They formed in the smallest dark matter halos, produced large amounts of ionizing photons, and polluted the universe with the first heavy elements. Near-field cosmology probes this early era through detailed study of nearby relic galaxies that have survived from ancient times.

21cm in the 21st century

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Location

SLAC, Kavli 3rd Floor Conf. Room

Speaker
Anže Slosar (Brookhaven National Laboratory)

Universe is full of neutral hydrogen shining in the 21-cm spin-flip transition. Using this line to trace cosmic structure allows us to map the large scale structure in three dimensions very efficiently and cheaply. In practice, this technique has proven to be devilishly difficult.

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