SIMBAD references

2020ApJ...896..117B - Astrophys. J., 896, 117-117 (2020/June-3)

Detection of a radio bubble around the ultraluminous X-ray source Holmberg IX X-1.


Abstract (from CDS):

We present C- and X-band radio observations of the famous utraluminous X-ray source (ULX) Holmberg IX X-1, previously discovered to be associated with an optical emission line nebula several hundred parsecs in extent. Our recent infrared study of the ULX suggested that a jet could be responsible for the infrared excess detected at the ULX position. The new radio observations, performed using the Karl G. Jansky Very Large Array (VLA) in B-configuration, reveal the presence of a radio counterpart to the nebula with a spectral slope of -0.56 similar to other ULXs. Importantly, we find no evidence for an unresolved radio source associated with the ULX itself, and we set an upper limit on any 5 GHz radio core emission of 6.6 µJy (4.1 x 1032 erg s–1). This is 20 times fainter than what we expect if the bubble is energized by a jet. If a jet exists its core component is unlikely to be responsible for the infrared excess unless it is variable. Strong winds which are expected in super-Eddington sources could also play an important role in inflating the radio bubble. We discuss possible interpretations of the radio/optical bubble and we prefer the jet+winds-blown bubble scenario similar to the microquasar SS 433.

Abstract Copyright: © Contribution of U.S. Naval Observatory; not subject to copyright in the United States.

Journal keyword(s): X-ray binary stars - Emission nebulae - Black holes - Radio jets - Supernova remnants

Simbad objects: 23

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