Why do we think that quasars are extremely distant quizlet?
Why do we think that quasars are extremely distant? Their spectra show immense redshifts.
What causes a quasar?
An accretion disc is a disc of material falling into a body such as a black hole. If material falls into the accretion disc around a supermassive black hole it gets heated by friction and gravitational effects to the point where it emits huge amounts of energy. This is a quasar.
What can we learn from quasars?
Quasars provide compelling evidence that we live in an evolving universe—one that changes with time. They tell us that astronomers living billions of years ago would have seen a universe that is very different from the universe of today.
Why is it difficult to get information on quasars?
The total energy collected by radio astronomers over the history of radio astronomy amounts to about the energy required for a mosquito to make one “push-up”!! The reason we don’t receive lots more radiation is that the sources (e.g., the quasars) are so very far away.
What is the difference between a quasar and a Blazar?
Blazars are extremely luminous, highly variable sources of radiation. Quasars are less energetic and steadier, and the ones that emit radio waves come in two varieties. In one case, most of the radio waves come from the quasar’s bright core; in the other, most are emitted by two lobes on opposite sides of the galaxy.
Are quasars Blazars?
Blazars: a New Type of Powerful Quasar They are also visible at radio or X-ray energies. This bright emission, billions of times stronger than our Sun, is likely produced by a supermassive black hole pulling in copious amounts of interstellar gas.
What is a blazar galaxy?
A blazar is a feeding super-massive black-hole (SMBH) in the heart of a distant galaxy that produces a high-energy jet viewed face-on from Earth. Like other forms of active galactic nuclei (AGN), blazars are the most luminous and energetic objects in the known universe.
Can a quasar escape a black hole?
No, a superheated quasar cannot escape a black hole once it crosses the all important Schwarzschild radius, the point at which it is not possible for…