<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Middleton, Matthew J.</style></author><author><style face="normal" font="default" size="100%">Miller-Jones, James C. A.</style></author><author><style face="normal" font="default" size="100%">Markoff, Sera</style></author><author><style face="normal" font="default" size="100%">Fender, Rob</style></author><author><style face="normal" font="default" size="100%">Henze, Martin</style></author><author><style face="normal" font="default" size="100%">Hurley-Walker, Natasha</style></author><author><style face="normal" font="default" size="100%">Scaife, Anna M. M.</style></author><author><style face="normal" font="default" size="100%">Roberts, Timothy P.</style></author><author><style face="normal" font="default" size="100%">Walton, Dominic</style></author><author><style face="normal" font="default" size="100%">Carpenter, John</style></author><author><style face="normal" font="default" size="100%">Macquart, Jean-Pierre</style></author><author><style face="normal" font="default" size="100%">Bower, Geoffrey C.</style></author><author><style face="normal" font="default" size="100%">Gurwell, Mark</style></author><author><style face="normal" font="default" size="100%">Pietsch, Wolfgang</style></author><author><style face="normal" font="default" size="100%">Haberl, Frank</style></author><author><style face="normal" font="default" size="100%">Harris, Jonathan</style></author><author><style face="normal" font="default" size="100%">Daniel, Michael</style></author><author><style face="normal" font="default" size="100%">Miah, Junayd</style></author><author><style face="normal" font="default" size="100%">Done, Chris</style></author><author><style face="normal" font="default" size="100%">Morgan, John S.</style></author><author><style face="normal" font="default" size="100%">Dickinson, Hugh</style></author><author><style face="normal" font="default" size="100%">Charles, Phil</style></author><author><style face="normal" font="default" size="100%">Burwitz, Vadim</style></author><author><style face="normal" font="default" size="100%">Della Valle, Massimo</style></author><author><style face="normal" font="default" size="100%">Freyberg, Michael</style></author><author><style face="normal" font="default" size="100%">Greiner, Jochen</style></author><author><style face="normal" font="default" size="100%">Hernanz, Margarita</style></author><author><style face="normal" font="default" size="100%">Hartmann, Dieter H.</style></author><author><style face="normal" font="default" size="100%">Hatzidimitriou, Despina</style></author><author><style face="normal" font="default" size="100%">Riffeser, Arno</style></author><author><style face="normal" font="default" size="100%">Sala, Gloria</style></author><author><style face="normal" font="default" size="100%">Seitz, Stella</style></author><author><style face="normal" font="default" size="100%">Reig, Pablo</style></author><author><style face="normal" font="default" size="100%">Rau, Arne</style></author><author><style face="normal" font="default" size="100%">Orio, Marina</style></author><author><style face="normal" font="default" size="100%">Titterington, David</style></author><author><style face="normal" font="default" size="100%">Grainge, Keith</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Bright radio emission from an ultraluminous stellar-mass microquasar in M 31</style></title><short-title><style face="normal" font="default" size="100%">Nature</style></short-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Astrophysics - High Energy Astrophysical Phenomena</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2013</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2013/01/1</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">https://ui.adsabs.harvard.edu/abs/2013Natur.493..187M</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">493</style></volume><pages><style face="normal" font="default" size="100%">187 - 190</style></pages><isbn><style face="normal" font="default" size="100%">0028-0836</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">A subset of ultraluminous X-ray sources (those with luminosities of less than 10&lt;SUP&gt;40&lt;/SUP&gt; erg s&lt;SUP&gt;-1&lt;/SUP&gt; ref. 1) are thought to be powered by the accretion of gas onto black holes with masses of ~5-20, probably by means of an accretion disk. The X-ray and radio emission are coupled in such Galactic sources; the radio emission originates in a relativistic jet thought to be launched from the innermost regions near the black hole, with the most powerful emission occurring when the rate of infalling matter approaches a theoretical maximum (the Eddington limit). Only four such maximal sources are known in the Milky Way, and the absorption of soft X-rays in the interstellar medium hinders the determination of the causal sequence of events that leads to the ejection of the jet. Here we report radio and X-ray observations of a bright new X-ray source in the nearby galaxy M 31, whose peak luminosity exceeded 10&lt;SUP&gt;39&lt;/SUP&gt; erg s&lt;SUP&gt;-1&lt;/SUP&gt;. The radio luminosity is extremely high and shows variability on a timescale of tens of minutes, arguing that the source is highly compact and powered by accretion close to the Eddington limit onto a black hole of stellar mass. Continued radio and X-ray monitoring of such sources should reveal the causal relationship between the accretion flow and the powerful jet emission.</style></abstract></record></records></xml>