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Observations of the BL Lacertae Object OJ 287 in 1997 April and Nov ember | | Naoki Isobe
; Makoto Tashiro
; Masahiko Sugiho
; Kazuo Makishima
; | | Date: |
2 Nov 2000 | | Subject: | astro-ph | | Affiliation: | University of Tokyo, Saitama University | | 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". | | Source: | arXiv, astro-ph/0011046 | | Services: | Forum | Review | PDF | Favorites | |
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