… We obtained a total of 141 observations of M82 with a total effective exposure of 281.2 ks
using the PCA on RXTE under program 90121 (PI: P. Kaaret). Two of the observations were …

… Because of the geometry of the binary system, the orbital period is related to the companion
star density ρ ≈ 115 P –2 g cm –3 , where P is the period in hours (11). For a 62-day orbital …

Using 400 days of new X-ray monitoring of M82, we confirm the 62 day periodicity previously
reported. In the full data set spanning 1124 days, we find a period of 62.0�0.3 days and a …

We review observations of ultraluminous X-ray sources (ULXs). X-ray spectroscopic and timing
studies of ULXs suggest a new accretion state distinct from those seen in Galactic stellar-…

We detected a major X-ray outburst from M82 with a duration of 79 days, an average flux of 5�
10− 11 erg cm-2 s− 1 in the 2–10 keV band, and strong variability. The X-ray spectrum …

The thermal dominant state in black hole binaries (BHBs) is well understood but rarely seen
in ultraluminous X-ray sources (ULXs). Using simultaneous observations of M82 with …

… We adopt the position of X41.4+60 from Kaaret et al. (2001) as a reference in order to
keep the source names consistent with those previously used in the literature. We found eight …

The ultraluminous X-ray source in M82 is, perhaps, the best candidate intermediate mass
black hole. We report on the discovery and interpretation of a 62 day X-ray periodicity found in …

… For comparison, we show the results of a fit of an absorbed power-law model to XMM-Newton
data (Feng & Kaaret 2005) and the hardness that would be obtained observing such a …

NGC 5408 X-1 is a well-studied ultraluminous X-ray source (ULX) that has been seen to emit
in X-rays persistently above the Eddington limit of a stellar mass black hole for years. In this …