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

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

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.

Citation

Dudik, R., Berghea, C., Roberts, T., Grise, F., Singh, A., Pagano, R., & Winter, L. (2016). SPITZER IRAC observations of IR excess in Holmberg IX X-1: A circumbinary disk or a variable jet?. Astrophysical Journal, 831(1), Article 88. https://doi.org/10.3847/0004-637x/831/1/88

• Journal Article Type: Article
• Acceptance Date: Aug 14, 2016
• Online Publication Date: Oct 28, 2016
• Publication Date: Oct 28, 2016
• Deposit Date: Nov 4, 2016
• Publicly Available Date: Dec 1, 2016
• Journal: Astrophysical Journal
• Print ISSN: 0004-637X
• Electronic ISSN: 1538-4357
• Publisher: American Astronomical Society
• Peer Reviewed: Peer Reviewed
• Volume: 831
• Issue: 1
• Article Number: 88
• DOI: https://doi.org/10.3847/0004-637x/831/1/88
• Related Public URLs: https://arxiv.org/abs/1608.05348