SPITZER IRAC OBSERVATIONS of IR EXCESS in HOLMBERG IX X-1: A CIRCUMBINARY DISK or A VARIABLE JET?

R. P. Dudik, C. T. Berghea, T. P. Roberts, F. Grisé, A. Singh, R. Pagano, L. M. Winter

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Abstract

We present Spitzer Infrared Array Camera photometric observations of the ultraluminous X-ray source (ULX, X-1) in Holmberg IX. We construct a spectral energy distribution (SED) for Holmberg IX X-1 based on published optical, UV, and X-ray data combined with the IR data from this analysis. We modeled the X-ray and optical data with disk and stellar models; however, we find a clear IR excess in the ULX SED that cannot be explained by fits or extrapolations of any of these models. Instead, further analysis suggests that the IR excess results from dust emission, possibly a circumbinary disk, or a variable jet.

Original languageEnglish (US)
Article number88
JournalAstrophysical Journal
Volume831
Issue number1
DOIs
Publication statusPublished - Nov 1 2016

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All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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