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Optical Counterpart of the Ultraluminous X-ray Source IC 342 X-1
Hua Feng, Philip Kaaret
We present Chandra and HST observations of the ultraluminous X-ray source (ULX) IC 342 X-1. The Chandra and HST images are aligned using two X-ray emitting foreground stars. The as…
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…
Origin of the X-ray Quasi-Periodic Oscillations and Identification of a Transient Ultraluminous X-Ray Source in M82
Hua Feng, Philip Kaaret
The starburst galaxy M82 contains two ultraluminous X-ray sources (ULXs), CXOM82 J095550.2+694047 (=X41.4+60) and CXOM82 J095551.1+694045 (=X42.3+59), which are unresolved by XMM-N…
Spectral Evolution of NGC 1313 X-2: Evidence Against The Cool Disk Model
Hua Feng, Philip Kaaret
The presence of a cool multicolor disk component with an inner disk temperature kT=0.1~0.3 keV at a luminosity L>10^40 erg/s has been interpreted as evidence that the ultraluminous…