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20042010
most citedSpectral State Transitions of the Ultraluminous X-ray Sources X-1 and X-2 in NGC 1313

81 citations · 191 across the 5 of their papers we have counts for

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astro-ph.HE2010★ 39 cited

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…