81 citations · 152 across the 4 of their papers we have counts for
7 papers
Confirmation of the 62 Day X-Ray Periodicity from M82
Philip Kaaret, Hua Feng
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…
Spectral State Transitions of the Ultraluminous X-ray Sources X-1 and X-2 in NGC 1313
Hua Feng, Philip Kaaret
X-ray spectral state transitions are a key signature of black hole X-ray binaries and follow a well-defined pattern. We examined 12 XMM-Newton observations of the nearby spiral gal…
A Comparison of Ultraluminous X-ray Sources in NGC 1399 and the Antennae Galaxies (NGC 4038/4039)
Hua Feng, Philip Kaaret
The temporal and spectral properties of ultraluminous X-ray sources (ULXs, L>2x10^39 ergs/s) and bright X-ray sources (L>3x10^38 ergs/s) are examined and compared in two extremely…
Double-Layer Silicon PIN Photodiode X-Ray Detector for a Future X-ray Timing Mission
Hua Feng, Philip Kaaret, Hans Andersson
A double-layer silicon detector consisting of two 500micron-thick silicon PIN photodiodes with independent readouts was mounted in a vacuum chamber and tested with X-ray sources. T…
XMM-Newton Observations of Ultraluminous X-Ray Sources in Nearby Galaxies
Hua Feng, Philip Kaaret
We examined X-ray spectral and timing properties of ultraluminous X-ray sources (ULXs) in nearby galaxies in XMM-Newton archival data. There appear to be three distinct classes of…
X-ray triple rings around the M87 jets in the central Virgo cluster
Hua Feng, Shuang-Nan Zhang, Yu-Qing Lou +1
The Chandra X-ray data of the central Virgo cluster are re-examined to reveal a triple-ring structure around the galaxy M87, reminiscent of the spectacular triple-ring pattern of t…