164 citations · 1.4k across the 37 of their papers we have counts for
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astro-ph.HE2009★ 56 cited
X-ray spectral variability in the ultraluminous X-ray source Holmberg IX X-1
K. Vierdayanti, C. Done, T. R. Roberts +1
We use XMM-Newton and Swift data to study spectral variability in the ultraluminous X-ray source (ULX), Holmberg IX X-1. The source luminosity varies by a factor 3-4, giving rise t…
astro-ph.HE2009★ 102 cited
A Systematic Study of Variability in a Sample of Ultraluminous X-ray Sources
L. M. Heil, S. Vaughan, T. P. Roberts
We present results from a study of short term variability in 19 archival observations by XMM-Newton of 16 Ultraluminous X-ray Sources (ULXs). Eight observations (six sources) showe…
astro-ph.HE2009★ 32 cited
The ultraluminous X-ray source population of NGC 4485/4490
J. C. Gladstone, T. P. Roberts
We report the results of spectral and temporal variability studies of the ultraluminous X-ray sources (ULXs) contained within the interacting pair of galaxies NGC 4485/4490, combin…