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What causes a quasar to die?

Answer 1

A quasar will stop radiating when is runs out of the material which generates the output.

Material falling into the accretion disc of a supermassive black hole at the center of a far-off galaxy is thought to be the cause of a quasar.

The massive energy output results from friction and gravitational stresses on material falling into the black hole-caused accretion disc.

The quasar will cease to emit light if the supply of material falling into the accretion disc runs out.

If more material becomes available due to the black hole's gravitational pull, a quasar may ignite or rekindle.

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Answer 2

Lydia Allen

When a quasar runs out of fuel—superheated gas that falls into a supermassive black hole at the center of a galaxy—it dies. The black hole powers the quasar by consuming material and emitting intense radiation; as the gas supply runs out, the quasar disappears.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.