Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997pasj...49..631i&link_type=abstract
Publications of the Astronomical Society of Japan, v.49, p.631-637.
Astronomy and Astrophysics
Astronomy
12
Bl Lacertae Objects, Galaxies: Individual (Oj 287), X-Rays: Spectra
Scientific paper
Reports have been made on the X-ray properties of the BL Lacertae object OJ 287, obtained with ASCA on 1994 November 18--19. Although the observation was made during a period of enhanced optical intensity, the obtained 0.5--10 keV flux falls below those from previous X-ray observations. Intensity variations on time scales of a few hours were detected, with a typical peak-to-peak amplitude of 20%. The X-ray spectra acquired with the SIS and the GIS are described consistently with a single power-law model with the galactic absorption, and the required photon index, ~ 1.7, is flatter than most of those previously observed from this object. The derived monochromatic X-ray flux at 1 keV, 0.76 mu Jy, exceeds the extrapolation from the lower frequency continua, which is based on near-simultaneous multi-band observations. A discussion is made concerning the origin of X-ray emission from OJ 287 in terms of the synchrotron and synchrotron-self-Compton mechanisms.
Fujimoto Ryuichi
Idesawa Eriko
Kii Tsuneo
Kubo Hidetoshi
Makino Fumiyoshi
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