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

D. Cseh, P. Kaaret, S. Corbel, F. Grisé, C. Lang, E. Körding, H. Falcke, P. G. Jonker, J. C.A. Miller-Jones, S. Farrell, Y. J. Yang, Z. Paragi, S. Frey

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33 Scopus citations

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 × 1039 erg s-1 that is associated with a time-averaged isotropic X-ray luminosity of at least 4 × 1039 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.

Original languageEnglish (US)
Article numberslt166
Pages (from-to)L1-L5
JournalMonthly Notices of the Royal Astronomical Society: Letters
Volume439
Issue number1
DOIs
StatePublished - Mar 2014

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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