4 papers · 1 filter
The Long-Term Variability of the X-Ray Sources in NGC 6946 and NGC 4485/4490
Joel K. Fridriksson, Jeroen Homan, Walter H. G. Lewin +2
We analyze data from five Chandra observations of the spiral galaxy NGC 6946 and from three Chandra observations of the irregular/spiral interacting galaxy pair NGC 4485/4490, with…
RXTE spectra of the Galactic microquasar GRO J1655-40 during the 2005 outburst
Koji Saito, Jeroen Homan, Kazutaka Yamaoka +3
We report on the results of a detailed spectral analysis of 389 RXTE observations of the Galactic microquasar GRO J1655-40, performed during its 2005 outburst. The maximum luminosi…
The distribution of kHz QPO frequencies in Sco X-1
Tomaso Belloni, Mariano Mendez, Jeroen Homan
The frequencies of kHz Quasi-Periodic Oscillations in the bright Low-Mass X-ray Binary Sco X-1 have been reported to appear preferentially in a 3:2 ratio. We show that a proper sta…
Discovery of a kHz QPO in 2S 0918-549
Peter G. Jonker, Michiel van der Klis, Jeroen Homan +6
We report the discovery of a kilohertz quasi-periodic oscillation (kHz QPO) in the low-mass X-ray binary (LMXB) 2S 0918-549. The kHz QPO has a frequency of 1156+-9 Hz, a FWHM of 70…