Radio Emission Associated with the Ultraluminous X-Ray Source in Holmberg II | Zendy

Neal A. Miller | Zendy; R. F. Mushotzky | Zendy; S. G. Neff | Zendy

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Radio Emission Associated with the Ultraluminous X-Ray Source in Holmberg II

Author(s) -

Neal A. Miller,

R. F. Mushotzky,

S. G. Neff

Publication year - 2005

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/430112

Subject(s) - physics , astrophysics , supernova remnant , nebula , astronomy , supernova , crab nebula , emission nebula , stars , gamma ray

We report the detection of radio emission coincident with the ultraluminousX-ray source (ULX) in Holmberg II. The radio emission is diffuse and resolved,covering an area ~60 by 40 pc in extent and well-matched to the recentlydiscovered HeII nebula surrounding the X-ray source. Comparison of the radioand optical properties of this extended radio emission argue against itsassociation with either an HII region or supernova remnant. This is additionalevidence that this ULX is not powered by a stellar-mass object whose emissionis relativistically beamed towards the observer, and thus is either asuper-Eddington source or intermediate mass black hole as suggested by opticalobservations. Implications of this result to future and existing radio studiesof ULXs are discussed.Comment: 5 pages with 3 figures, to appear in ApJ Letter

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