Astronomy › Section T · Galaxies and quasars › Topic T.8
Quasars as probes of cosmic history
Quasars are bright enough to see across most of cosmic history. Their numbers over time, their link to their host galaxies, and the gas their light passes through all record how the universe and its black holes grew up.
In this topic
- Beacons from the past
- The rise and fall of quasars
- Why quasars faded
- Black holes and their galaxies
- Worked example: predicting a black hole
- Feedback
- A speed limit on growth
- Worked example: racing to a billion Suns
- Where did the seeds come from?
- Quasars as backlights
- Common mistakes to avoid
- Key takeaways
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