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.

doi:10.3847/0004-637x/831/1/88

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.

Authors

R.P. Dudik

C.T. Berghea

Professor Tim Roberts t.p.roberts@durham.ac.uk
Professor

F. Grise

A. Singh

R. Pagano

L.M. Winter

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