TY - JOUR
T1 - Unveiling recurrent jets of the ULX holmberg II X-1
T2 - Evidence for a massive stellar-mass black hole?
AU - Cseh, D.
AU - Kaaret, P.
AU - Corbel, S.
AU - Grisé, F.
AU - Lang, C.
AU - Körding, E.
AU - Falcke, H.
AU - Jonker, P. G.
AU - Miller-Jones, J. C.A.
AU - Farrell, S.
AU - Yang, Y. J.
AU - Paragi, Z.
AU - Frey, S.
PY - 2014/3
Y1 - 2014/3
N2 - 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.
AB - 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.
UR - https://www.scopus.com/pages/publications/84897585418
UR - https://www.scopus.com/pages/publications/84897585418#tab=citedBy
U2 - 10.1093/mnrasl/slt166
DO - 10.1093/mnrasl/slt166
M3 - Article
AN - SCOPUS:84897585418
SN - 1745-3925
VL - 439
SP - L1-L5
JO - Monthly Notices of the Royal Astronomical Society: Letters
JF - Monthly Notices of the Royal Astronomical Society: Letters
IS - 1
M1 - slt166
ER -