8 papers
RXTE Observations of 3C273 between 1996 and 2000:Variability Timescale and Jet Power
Jun Kataoka, Chiharu Tanihata, Nobuyuki Kawai +4
We present the results of a long-look monitoring of 3C273 with RXTE between 1996 and 2000. A total of 230 observations amounts to a net exposure of 845ksec, with this spectral and…
Complex Spectral Variability from Intensive Multi-wavelength Monitoring of Mrk421 in 1998
T. Takahashi, J. Kataoka, G. Madejski +20
We conducted a multi-frequency campaign for the TeV blazar Mrk~421 in 1998 April. The campaign started from a pronounced high amplitude flare recorded by SAX and Whipple; ASCA obse…
Rapid Synchrotron Flares from BL Lacertae Detected by ASCA and RXTE
C. Tanihata, T. Takahashi, J. Kataoka +6
We report the variable X-ray emission from BL Lacertae detected in the ASCA ToO observation conducted during the EGRET and RXTE pointings, coincident with the 1997 July outburst. T…
Changes in the long term intensity variations in Cyg X-2 and LMC X-3
B. Paul, S. Kitamoto, F. Makino
We report the detection of changes in the long-term intensity variations in two X-ray binaries, Cyg X-2 and LMC X-3. In this work, we have used the long-term light curves obtained…
Variability Pattern and the Spectral Evolution of the BL Lacertae Object PKS 2155-304
J. Kataoka, T. Takahashi, F. Makino +5
The TeV blazar PKS 2155-304 was monitored with the X-ray satellite ASCA in 1994 May, as part of a multiwavelength campaign from the radio to X-ray bands. At the beginning of the tw…
A Study of High Energy Emission from the TeV blazar Mrk 501 during Multiwavelength Observations in 1996
J. Kataoka, J. R. Mattox, J. Quinn +8
We present the results of a multiwavelength campaign for Mrk 501 performed in March 1996 with ASCA, EGRET, Whipple, and optical telescopes. In the X-ray band, a spectral break was…