20 papers
Integral observation of Cyg X-1 in an intermediate state
J. Malzac, P. O. Petrucci, E. Jourdain +11
We present preliminary results of an observation of Cygnus X-1 with INTEGRAL performed on June 7-11 2003. Both spectral and variability properties of the source indicate that Cygnu…
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…
GRS 1915+105: The first three months with INTEGRAL
D. C. Hannikainen, O. Vilhu, J. Rodriguez +19
GRS 1915+105 is being observed as part of an Open Time monitoring program with INTEGRAL. Three out of six observations from the monitoring program are presented here, in addition t…
Strong QPOs and High Energy Tail in Simultaneous RXTE/INTEGRAL Observations of GRS 1915+105
J. Rodriguez, Y. Fuchs, D. C. Hannikainen +4
We present the first results of the timing analysis of our RXTE/INTEGRAL monitoring campaign on GRS 1915+105. Over the 6 already performed RXTE observations, we study the presence…
The 2002 outburst of the microquasar XTE J1550-564
A. P. Colombo, T. Belloni, J. Homan +2
We present results of spectral and timing analysis based on 11 RXTE PCA/HEXTE observations of the microquasar XTE J1550-564 during its last outburst in January 2002. The observed b…
GX 339-4: back to life
T. Belloni, E. Nespoli, J. Homan +4
We report preliminary results of a RossiXTE campaign on the 2002 outburst of the black-hole candidate GX 339-4. We show power density spectra of five observations during the early…