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- W2073706614 abstract "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 previous X-ray observations, and no evidence of intensity variations was found during each observation. The obtained flux densities at 1 keV, 0.22~0.26 uJy, exceed the extrapolations from lower frequency synchrotron continua, which were measured in nearly the same period as the present ASCA observations. The X-ray spectra acquired with the GIS and SIS were consistently described with a single power law model modified with the Galactic absorption, and the derived photon indices, 1.5 ~ 1.6, are flatter than those observed so far. These results strongly suggest that the X-ray spectra observed in 1997 arise via inverse Compton process alone. The X-ray spectra obtained in 1994 (Idesawa et al 1997), exhibiting a steeper slope than those in 1997, is thought to be contaminated by synchrotron soft tail." @default.
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- W2073706614 date "2001-02-25" @default.
- W2073706614 modified "2023-10-18" @default.
- W2073706614 title "ASCA Observations of the BL Lacertae Object OJ 287 in 1997 April and November" @default.
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- W2073706614 doi "https://doi.org/10.1093/pasj/53.1.79" @default.
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