Astro101 - "What is the difference between an active galactic nucleus and a quasar?"
Resumen
TLDRThis passage explains the concept of supermassive black holes, particularly those designated as active galactic nuclei (AGN). These are black holes actively growing by consuming gas, causing them to emit substantial amounts of light, allowing astronomers to observe them. AGNs typically reside in the centers of galaxies, in their galactic nuclei. Quasars represent the brightest subset of AGNs, initially detected as quasi-stellar objects (QSO) due to their starlike appearance but significant differences, particularly at great distances. The passage also touches on the historical terminology and radio wavelength observations that helped classify these phenomena.
Para llevar
- 🌌 Active Galactic Nucleus: Describes growing black holes in galaxy centers.
- 🔭 Observation: Done through the light emitted by infalling gas.
- 📚 Quasars: Brightest subset of active galactic nuclei.
- ⚡ Energy Emission: Result of gas heating up as it nears the black hole.
- 🌟 Historical Term: Quasars were once called quasi-stellar objects.
- 🔍 QSO: An early term for quasars due to their star-like appearance.
- 📡 Radio Observations: Added to understanding of black holes and AGNs.
- 💡 Active Growth: Signified by constant gas flow into black holes.
- 🌀 Galactic Nucleus: Central region where AGNs reside in galaxies.
- ✨ High Luminosity: Key feature of quasars compared to other AGNs.
Cronología
- 00:00:00 - 00:02:30
An active galactic nucleus (AGN) is an actively growing supermassive black hole located at the center of a galaxy, and these can be observed by the light emitted from the gas flowing into it, which gets extremely hot. This makes the black hole active, as it grows by accumulating mass from the gas. The term AGN refers broadly to any such black hole, while a quasar is a highly luminous example of an AGN. Originally, these bright objects were identified as quasi-stellar objects (QSO) due to their star-like appearance at high distances. Over time, terminology evolved to describe various properties, including radio wave emissions and bright jets, associated with these luminous black holes.
Mapa mental
Vídeo de preguntas y respuestas
What is an active galactic nucleus (AGN)?
An AGN is a growing supermassive black hole located at the center of a galaxy, actively consuming gas, and emitting light.
What is the relationship between quasars and AGNs?
Quasars are the brightest and most luminous subset of active galactic nuclei (AGNs).
How can we observe supermassive black holes?
By observing the light emitted by the gas that flows into the black hole and gets extremely hot outside the event horizon.
What happens when gas flows into a black hole?
The gas gets very hot as it approaches the event horizon, emitting a lot of light, indicating an active galactic nucleus.
What does QSO stand for?
QSO stands for quasi-stellar object, a term used historically when quasars were first discovered.
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- Supermassive Black Hole
- Active Galactic Nucleus
- Quasar
- Astronomy
- Galaxies
- Stellar Objects
- Gas Flow
- Event Horizon
- Luminosity
- Radio Wavelengths