<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>47</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Meusinger, H.</style></author><author><style face="normal" font="default" size="100%">Henze, M.</style></author><author><style face="normal" font="default" size="100%">Birkle, K.</style></author><author><style face="normal" font="default" size="100%">Pietsch, W.</style></author><author><style face="normal" font="default" size="100%">Williams, B.</style></author><author><style face="normal" font="default" size="100%">Hatzidimitriou, D.</style></author><author><style face="normal" font="default" size="100%">Nesci, R.</style></author><author><style face="normal" font="default" size="100%">Ertel, S.</style></author><author><style face="normal" font="default" size="100%">Hinze, A.</style></author><author><style face="normal" font="default" size="100%">Bertold, T.</style></author><author><style face="normal" font="default" size="100%">Kaminsky, B.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">A unique UV flare in the optical light curve of the quasar J004457.9+412344</style></title><short-title><style face="normal" font="default" size="100%">European Physical Journal Web of Conferences</style></short-title></titles><dates><year><style  face="normal" font="default" size="100%">2012</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2012/12/1</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">https://ui.adsabs.harvard.edu/abs/2012EPJWC..3908001M</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">39</style></volume><pages><style face="normal" font="default" size="100%">08001</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">We found that the nova candidate J004457.9+412344 is a radio-quiet quasar at z ∼ 2. Its optical long-term light curve, covering more than half a century, shows quasar typical flux variations superimposed by a spectacular single flare lasting more than one year (observer frame). We could not find comparable light curves among the several thousand catalogued radio-quiet quasars in the stripe 82 of the Sloan Digital Sky Survey. The decreasing part of the flare light curve roughly follows a power law t&lt;SUP&gt;-5/3&lt;/SUP&gt;. The quasar spectrum, the total energy of the flare, and the decline of the light curve are consistent with the tidal disruption of a ∼10 M&lt;SUB&gt;ʘ&lt;/SUB&gt; giant star by a supermassive black hole of a few 10&lt;SUP&gt;8&lt;/SUP&gt; M&lt;SUB&gt;ʘ&lt;/SUB&gt;. We argue that the alternative explanation by gravitational microlensing is less likely, though it cannot be definitely excluded.</style></abstract></record></records></xml>