Black hole accretion disks and quasars

Question

Are 'accretion disk of a black hole' and 'quasar' synonymous? If not, what's the difference?

Answer 1

No they both are different in there properties.I mean they are part of one complete process with different properties..

..As Quasar and Accretion_disk states...

Accretion Disk

1. is a structure disk formed by material in orbit around central body(star).

2. got gravity causes material in the disk to spiral inward towards the central body.

3. is compressed by forces to raise the temperature of the material causing the emission of electromagnetic radiation.

4. has frequency range of that radiation depends on the central object's mass.

   Which means radiation for :

   1. Young stars and Protostars : Infrared
   2. Neutron stars and Black holes : X-ray

   part of the spectrum.

On other hand,

Quasar

1. is radio sources are the most energetic object

2. they posses high redshift sources of electromagnetic energy.

3. radiate

   1. Radio waves
   2. Visible light

4. have luminosity 100 times greater than that of the Milky Way.

5. are normally caused by collisions of galaxies, with the galaxies' central black holes merging to form either a supermassive black hole or a binary black hole system.

Summary :

Accretion Disk is a disk of materials around star.

Quasar is radio sources formed when two galaxies collides centering single or binary black hole