Seyfert Galaxies & Quasars: Redshift Differences Explained

In summary, astronomers believe that Seyfert galaxies and quasars are essentially the same, but their different redshifts are due to their different luminosities and energy production processes.
  • #1
kop442000
34
0
I have read on a NASA website amongst other places that "Many astronomers believe that Seyfert galaxies and high-energy quasars are basically the same type of objects, but we are simply viewing them differently".

But on the same website it also says that "by measuring their redshifts, we find that Seyferts are much closer to us than quasars or blazars."

But if they are the same things, why do we not see find them at the same redshifts? Is it just because Seyferts for example are not energetic enough that we can detect them at high redshifts?

Thank you,
kop442000.
 
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  • #2
The difference in redshifts has to do with the physical properties of the two types of objects. Seyfert galaxies are usually much less luminous than quasars and blazars, so they appear at lower redshifts. Furthermore, quasars and blazars are powered by accretion onto a supermassive black hole, and this process produces a lot of energy which can be detected from far away. Seyfert galaxies, on the other hand, produce less energy and so can only be seen from closer distances.
 

Related to Seyfert Galaxies & Quasars: Redshift Differences Explained

1. What are Seyfert galaxies and quasars?

Seyfert galaxies and quasars are types of active galactic nuclei (AGN) that emit high levels of energy, including visible light, X-rays, and radio waves. They are powered by a supermassive black hole at the center of the galaxy that is actively accreting matter.

2. What is the difference between Seyfert galaxies and quasars?

The main difference between Seyfert galaxies and quasars is their level of energy output. Seyfert galaxies are less luminous and have lower redshift values, indicating they are closer to Earth. Quasars, on the other hand, are extremely luminous and have much higher redshift values, meaning they are farther away.

3. How are redshift differences used to explain the distance of Seyfert galaxies and quasars?

The redshift of an object is a measure of how much its light has been stretched due to the expansion of the universe. The higher the redshift value, the farther the object is from Earth. Quasars have much higher redshift values than Seyfert galaxies, indicating they are much farther away in the universe.

4. What causes the redshift differences between Seyfert galaxies and quasars?

The redshift differences between Seyfert galaxies and quasars are primarily caused by the Doppler effect, which is the apparent change in the wavelength of light due to the relative motion between the source of light and the observer. Quasars have much higher redshift values because they are moving away from Earth at higher velocities compared to Seyfert galaxies.

5. How do redshift differences impact our understanding of the universe?

The redshift differences between Seyfert galaxies and quasars can help us determine their distances from Earth and therefore give us a better understanding of the size and structure of the universe. They also provide evidence for the expansion of the universe and can help us study the evolution of galaxies and supermassive black holes.

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