354 citations · 521 across the 9 of their papers we have counts for
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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 +4
We present Spitzer Infrared Array Camera (IRAC) photometric observations of the Ultra-luminous X-ray Source (ULX, X-1) in Holmberg IX. We construct a spectral energy distribution (…
The XMM-Newton serendipitous survey. VII. The third XMM-Newton serendipitous source catalogue
S. R. Rosen, N. A. Webb, M. G. Watson +37
Thanks to the large collecting area (3 x ~1500 cm at 1.5 keV) and wide field of view (30' across in full field mode) of the X-ray cameras on board the European Space Agency X-r…
Evolution of the spectral curvature in the ULX Holmberg II X-1
J. J. E. Kajava, J. Poutanen, S. A. Farrell +2
Ultraluminous X-ray sources (ULXs) are interesting systems as they can host intermediate mass black holes. Alternatively, ULXs can represent stellar-mass black holes accreting at s…
Searching for the orbital period of the ultraluminous X-ray source NGC 1313 X-2
L. Zampieri, D. Impiombato, R. Falomo +2
We analyzed the longest phase-connected photometric dataset available for NGC 1313 X-2, looking for the ~6 day modulation reported by Liu et al. (2009). The folded B band light cur…
Optical emission of the ultraluminous X-ray source NGC 5408 X-1: donor star or irradiated accretion disk?
Fabien Grisé, Philip Kaaret, Stéphane Corbel +3
We obtained 3 epochs of simultaneous Hubble Space Telescope (HST)/Wide Field Camera 3 and Chandra observations of the ultraluminous X-ray source NGC 5408 X-1. The counterpart of th…
X-ray spectral state is not correlated with luminosity in Holmberg II X-1
Fabien Grisé, Philip Kaaret, Hua Feng +2
The ultraluminous X-ray source (ULX) Holmberg II X-1 has been observed over 4 months in 2009/2010 by the Swift observatory. The source luminosity varied by a factor of up to 14, re…