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Bright radio emission from an ultraluminous stellar-mass microquasar in M 31
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2013 (English)In: Nature, ISSN 0028-0836, Vol. 493, no 7431, 187-190 p.Article in journal (Refereed) Published
Abstract [en]

A subset of ultraluminous X-ray sources (those with luminosities of less than 10(40) erg s(-1); ref. 1) are thought to be powered by the accretion of gas onto black holes with masses of similar to 5-20M(circle dot), probably by means of an accretion disk(2,3). 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(4,5), 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(6), 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(39) erg s(-1). 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.

Place, publisher, year, edition, pages
2013. Vol. 493, no 7431, 187-190 p.
National Category
Natural Sciences
URN: urn:nbn:se:su:diva-87696DOI: 10.1038/nature11697ISI: 000313259600032OAI: diva2:605849
EU, European Research Council


Available from: 2013-02-15 Created: 2013-02-14 Last updated: 2013-02-15Bibliographically approved

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Dickinson, Hugh
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The Oskar Klein Centre for Cosmo Particle Physics (OKC)
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