CGCA Seminars
Events
Calendar of Events
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Black Holes: Bridging Simulations and Observations In recent years, General Relativistic Magnetohydrodynamic (GRMHD) simulations, combined with multiwavelength observations have provided critical insights into the nature of radiation from accreting black holes. These simulations have revealed a particularly interesting magnetically arrested disk (MAD) regime whereby the accretion is choked by strong magnetic fields. The higher magnetic flux characteristic of the MAD regime leads to new dynamics, including interchange-type accretion modes and flux eruptions. Polarization measurements by the Event Horizon Telescope (EHT) from the supermassive black holes M87* and Sagittarius A* (Sgr A*) favor MAD states. However, nearly all MAD models exhibit greater 230 GHz flux variability than seen in historical observations of Sgr A*. |
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Ohana Kilo Hoku: Hawaiian Culture Based Astronomy Outreach Astronomy in Hawaii has become highly controversial in recent years, with construction of new telescopes on Mauna Kea drawing large protests from the local communities, especially Native Hawaiians. As someone who was born and raised on the island of Oahu in Hawaii, and has Native Hawaiian ancestry, I share my perspective on the conflict and present on the work of Ohana Kilo Hoku, a Native Hawaiian non-profit organization I am a member of. Drawing inspiration from ancient Native Hawaiian's who used the night sky to navigate the Pacific Ocean, we work to cultivate relationships between the youth and the science of the sky above. |
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