Quasars (AQA A-Level Physics): Flashcards
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What is a quasar?
What is a quasar?
Active galactic nucleus with supermassive black hole
What is at a quasar's centre?
What is at a quasar's centre?
Supermassive black hole
What surrounds a quasar's black hole?
What surrounds a quasar's black hole?
Accretion disc of gas and dust
Why are quasars extremely bright?
Why are quasars extremely bright?
Material heats up spiralling into black hole, emits radiation
What is a key optical characteristic of quasars?
What is a key optical characteristic of quasars?
Large red-shift
What does quasars' red-shift indicate about distance?
What does quasars' red-shift indicate about distance?
They are the most distant objects observable
How does quasar luminosity compare to galaxies?
How does quasar luminosity compare to galaxies?
Equivalent to several galaxies combined
What is the typical size of a quasar?
What is the typical size of a quasar?
Few light-years across
What was the first quasar discovered?
What was the first quasar discovered?
How does 's luminosity compare to the Milky Way?
How does 's luminosity compare to the Milky Way?
1,000 times greater