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Discovery of Spectral Transitions from Two Ultra-Luminous Compact X-Ray Sources in Ic342
Aya Kubota, Tsunefumi Mizuno, Kazuo Makishima +4
Two {\it ASCA} observations were made of two ultra-luminous compact X-ray sources (ULXs), Source 1 and Source 2, in the spiral galaxy IC 342. In the 1993 observation, Source 2 show…
Observations of the BL Lacertae Object OJ 287 in 1997 April and Nov ember
Naoki Isobe, Makoto Tashiro, Masahiko Sugiho +1
X-ray properties of the BL Lacertae object OJ 287, observed with ASCA on 1997 April 26 and November 17, are reported. The 0.5 -- 10 keV flux was lower than those obtained in previo…
ASCA and other contemporaneous observations of the blazar B2 1308+326
D. Watson, N. Smith, L. Hanlon +8
The high redshift (z=0.997) blazar B2 1308+326 was observed contemporaneously at x-ray, optical and radio wavelengths in June 1996. The x-ray observations were performed with ASCA.…
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…
The Nature of Ultra-Luminous Compact X-Ray Sources in Nearby Spiral Galaxies
Kazuo Makishima, Aya Kubota, Tsunefumi Mizuno +12
Studies were made of ASCA spectra of seven ultra-luminous compact X-ray sources (ULXs) in nearby spiral galaxies; M33 X-8 (Takano et al. 1994), M81 X-6 (Fabbiano 1988b; Kohmura et…