A recent study suggests that quasars, or supermassive black holes at the centers of galaxies, can be hidden by dense clouds of gas and dust in their host galaxies. This challenges the previous idea that quasars are only obscured by donut-shaped rings of dust in the close vicinity of the black hole. 

The researchers observed a sample of very dusty quasars with high rates of star formation using the Atacama Large Millimeter Array (ALMA) in Chile. 

Quasars can exist for many years as long as the black hole has material to consume. They eventually disappear or go “dormant” when material for the black hole to consume is in short supply. After a quasar finishes accreting the surrounding gas and dust, it becomes an ordinary galaxy

A new study reveals that supermassive black holes at the centers of galaxies, known as quasars, can sometimes be obscured by dense clouds of gas and dust in their host galaxies. This challenges the prevailing idea that quasars are only obscured by donut-shaped rings of dust in the close vicinity of the black hole

Yes, quasars can turn into galaxies: 

• Quasars were more common billions of years ago 
• Quasars may have created some galaxies 
• Quasars are active galactic nuclei (AGNs): 
• Quasars are supermassive black holes 
• Quasars are extremely luminous 
• Quasars are in galaxies of stars 

Quasars were more likely to be active when the universe was young and fuel for their accretion disk was more available. Astronomers speculate that quasars mark an early stage in the formation of galaxies. 

Quasars are a type of active galactic nucleus, or AGN. There are many different types of AGNs, each with their own story to tell.

Quasars are rare objects, and the brightest quasars are even rarer. Quasars are more luminous, so we can detect them from farther away. Quasars are also rare compared with their lower-luminosity counterparts. 

Quasars were more active at redshift z∼2. This is thought to be because quasar activity is triggered by galaxy mergers, which bring gas into galactic centers so that the supermassive black holes can be fed. Galaxy mergers and star formation peaked at z∼2. 

Quasars are more likely to be active when the universe was young and fuel for their accretion disk was more available. Over tens of thousands of years black holes run out of gas and dust to eat, so quasars dim and grow quiescent

There are several pieces of evidence for quasars, including: 

• X-ray surveys: Astronomers consider a high level of X-ray emission to be a sure sign of an accreting black-hole system. 
• Variability: Quasars can change their brightness quickly, which suggests they must be small. 
• Red shift: Quasars have a very large red shift. 
• Redshift: All observed quasar spectra have redshifts between 0.056 and 7.64. 
• Spectral lines: Quasars have large redshifts in their spectral lines. 
• Gravitational lensing: Some quasars are gravitationally lensed by distant galaxies. 
• Light: Some light from quasars contains less redshifted absorption lines of distant galaxies. 

Quasars can be observed at radio, infrared, visible, ultraviolet, and X-ray wavelengths. The most powerful quasars have luminosities exceeding 10^41 W, thousands of times greater than the luminosity of a large galaxy such as the milky way.

Scientists believe that quasars are the extremely luminous centers of galaxies in their infancy. They are a type of active galactic nucleus, or AGN. An active galaxy is one in which the central supermassive black hole is consuming large amounts of matter. 

Quasars are powered by accretion of material into supermassive black holes in the nuclei of distant galaxies. Light and other radiation cannot escape from within the event horizon of a black hole. 

Quasars are extremely luminous because the gravity of the black hole is very strong near its event horizon. Material in the accretion disk is falling in and releasing a huge amount of gravitational energy as it falls. It is this energy that powers the glowing accretion disk and explains the luminosity of quasars

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