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How are accretion disks detected?

Answer 1

Gravity and Friction cause the material in the disk to emit electromagnetic radiation.

After the radiation is emitted it's pretty simple to detect. Accretion disks are one of the reasons we can detect Black Holes.

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Answer 2

Owen Atkinson

Astronomers can identify accretion disks with telescopes and other instruments because they emit radiation across the electromagnetic spectrum, which is detected by a variety of methods, including optical and radio observations.

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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.