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The Mystery of Nine Disappearing Stars | Mysterious Universe

"Cold Quasars" Are the Harbingers of Galactic Death, Or Are They?


Quasars are fascinating objects. In the simplest possible terms, quasars are bright accretion disks that form when intense heat and light is emitted from the accretion disk. This is caused by friction produced from the material swirling around, and eventually into, the black hole. The material gathers around the event horizon the point at which gravity becomes so strong that no matter not even light is able to escape. As the material around the black hole spins, friction heats up the gases and other material in the accretion disk, making them visible in optical light, x-ray, and infrared wavelengths on the electromagnetic spectrum. ....

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SMU professor receives NASA funding to study Active Galactic Nuclei


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IMAGE: SMU astrophysicist Krista Lynne Smith receives NASA funding to study distant galaxies built around massive black holes.
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Credit: SMU (Southern Methodist University)
DALLAS (SMU) - Krista Lynne Smith, an assistant professor of physics at SMU, has received a grant from NASA to study one of the most extreme objects in the universe - Active Galactic Nuclei.
These objects, called AGN for short, are galaxies with a central supermassive black hole feeding on gas from what s called an accretion disk.
The two-year grant of $215,000 will allow Smith to analyze data from NASA s Transiting Exoplanet Survey Satellite (TESS) to answer a variety of questions about Active Galactic Nuclei and the gas that fuels them. ....

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