Quasars in Astronomy and Astrophysics

Quasars in Astronomy and Astrophysics.


Quasars in Astronomy and Astrophysics now ready for use. Active galactic nuclei (AGNs), extremely bright galactic centers where gas and dust are plunging into supermassive black holes, emit electromagnetic radiation throughout the entire electromagnetic spectrum. Quasars are a subclass of AGNs. The intense gravitational and frictional forces that are placed on the gas and dust as they fall into the black hole cause them to glow.

How Do Quasars Form?

An exceptionally vibrant and active galactic nucleus is known as a quasar (AGN). All AGNs are AGNs, but not all AGNs are AGNs.

Some of the brightest objects in the known universe are quasars, which generally emit millions of times as much light as the Milky Way does. They stand out from other AGNs due to their incredible brilliance and great distances from Earth. Because light travels at a fixed speed, objects seen from Earth appear exactly as they did . The closest quasars to Earth are still hundreds of millions of light-years away, and therefore they are still visible now as they were hundreds of millions of years ago. Although there may not have been any quasars in our area of the universe, their absence indicates that there were quasars there when the universe was younger.

An exceptionally vibrant and active galactic nucleus is known as a quasar (AGN). All AGNs are quasars, but not all quasars are AGNs. Credits: NASA, M. Kornmesser, ESA/Hubble. Hubble’s 100,000th exposure in 1996 was commemorate  a photo of a quasar that was 9 billion light-years away from Earth.

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Hubble’s observation of the early Universe’s brightest quasar now in 2019. Strong gravitational lensing enabled scientists to locate the old quasar after 20 years of searching. The light from the quasar is bent by a faint galaxy that lies directly between it and Earth. Making it appear 50 times brighter and three times larger than it would be without gravitational lensing.

 The lensed quasar is still quite small and unresolved in pictures taken with optical ground-based telescopes. Only Hubble’s keen vision was able to resolve the system, and this rare object sheds light on how galaxies first formed when the universe was only a few billion years old. Our knowledge of the speed at which the universe is expanding and aid by Hubble’s investigation  quasars.

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Hubble has also photographed quasar ghosts, which are ghostly green objects that mark the graves of objects that once flashed to life and then faded. These odd objects, which revolve around their host galaxies and glow brightly and ominously green, provide information about the past of these galaxies.

Source: scitechdaily


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