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We present Spitzer Infrared Array Camera (IRAC) photometric observations ofthe Ultra-luminous X-ray Source (ULX, X-1) in Holmberg IX. We construct aspectral energy distribution (SED) for Holmberg IX X-1 based on publishedoptical, UV and X-ray data combined with the IR data from this analysis. Wemodeled the X-ray and optical data with disk and stellar models, however wefind a clear IR excess in the ULX SED that cannot be explained by fits orextrapolations of any of these models. Instead, further analysis suggests thatthe IR excess results either from dust emission, possibly from a circumbinarydisk or from a variable jet.

Spitzer IRAC observations of IR excess in Holmberg IX X-1: A circumbinary disk or a variable jet?