The 365 Days of Astronomy EVSN - Dual Quasars, Tidal Disruption Events & a Halo For Andromeda
Aug 29, 2025
Dive into the fascinating world of dual quasars, where merging supermassive black holes reveal secrets about galaxy evolution. Discover the challenges astronomers face while identifying these rare cosmic pairs and the significance of tidal disruption events. The discussion also explores the expansive halo surrounding the Andromeda galaxy, highlighting its influence on the Milky Way and distant quasars. Community support plays a crucial role in advancing our understanding of the universe.
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Rarity And Importance Of Dual Quasars
- Dual quasars are a rare but important stage in galaxy mergers occurring in about three per 1,000 quasars.
- They reveal how merging black holes grow and influence host galaxy evolution.
Search Strategy For Binary Quasars
- Combine wide surveys with high-resolution follow-up to find close dual quasar systems.
- Use spectroscopy to confirm candidates by checking for two accretion disks at the same redshift.
What Tidal Disruption Events Produce
- Tidal disruption events (TDEs) occur when stars get torn apart by strong tidal forces near supermassive black holes.
- TDEs produce luminous flares and can launch bubbles into surrounding interstellar gas.