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Extreme variability quasars

11 Jul 2017, 12:00 UTC
Extreme variability quasars
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Title: Extreme variability quasars from the Sloan Digital Sky Survey and the Dark Energy SurveyAuthors: Nick Rumbaugh, Yue Shen, Eric Morganson et al.First Author’s Institution: National Center for Supercomputing Applications, IL.Status: Submitted to ApJ, open access
Active galactic nuclei (AGNs), the central active regions of supermassive black holes, have many masks. They span a large range of luminosities from roughly ten billion to ten thousand Milky Ways (even at their dimmest, they are still one of the brightest objects in the Universe). They have varying radio brightnesses and the presence of radio jets is not a luxury to be had by all. When scrutinized with a spectrograph, they reveal telltale signs of different anatomies. Some exhibit broad emission lines, others narrow, and still others both. Therefore, AGNs carry a myriad of different names, such as Seyferts, blazars, and quasars. However, the multifaceted appearances of AGNs are deceiving — the AGN unification theory postulates that which type of AGN you see depends on your viewing angle and the wavelength of light you’re looking in. Otherwise, you’re simply looking at one and the same object, the central bright region of a supermassive black hole. All AGNs have one thing in common: they ...

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