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Unveiling recurrent jets of the ULX Holmberg II X-1: evidence for a massive stellar-mass black hole?

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Authors
Cseh, D.
Kaaret, P.
Corbel, S.
Grisé, F.
Lang, C.
Kording, E.
Falcke, H.
Jonker, P.
Miller-Jones, James
Farrell, S.
Yang, Y.
Paragi, Z.
Frey, S.
Date
2014
Type
Journal Article

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Cseh, D. and Kaaret, P. and Corbel, S. and Grisé, F. and Lang, C. and Körding, E. and Falcke, H. and Jonker, P.G. and Miller-Jones, J.C.A. and Farrell, S. and Yang, Y.J. and Paragi, Z. and Frey, S. 2014. Unveiling recurrent jets of the ULX Holmberg II X-1: evidence for a massive stellar-mass black hole? Monthly Notices of the Royal Astronomical Society: Letters. 439 (1): pp. L1-L5.
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Monthly Notices of the Royal Astronomical Society: Letters
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This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society, © 2014 The Authors. Published by Oxford University Press on behalf of Royal Astronomical Society: Letters. All rights reserved.

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Abstract

We report on the discovery of an apparent triple radio structure hidden inside the radio bubble of the ultraluminous X-ray source Holmberg II X-1. The morphology is consistent with a collimated jet structure, which is observed to emit optically thin synchrotron radiation. The central component has a steep radio spectrum and is brighter than the outer components indicating a renewed radio activity. We estimate a minimum time-averaged jet power of ~2 × 10^39 erg s-1 that is associated with a time-averaged isotropic X-ray luminosity of at least 4 × 10^39 erg s-1. Our results suggest that Holmberg II X-1 is powered by a black hole of MBH = 25 M☉, that is inferred to be accreting at a high Eddington rate with intermittent radio activity.