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Title:
X-Ray Observations of the BL Lacertae Object OJ 287 with ASCA
Authors:
Idesawa, Eriko; Tashiro, Makoto; Makishima, Kazuo; Kubo, Hidetoshi; Otani, Chiko; Fujimoto, Ryuichi; Kii, Tsuneo; Makino, Fumiyoshi; Takahashi, Tadayuki; Ueda, Yoshihiro; Ohashi, Takaya
Affiliation:
AA(Department of Physics, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113; E-mail(MT): ), AB(Department of Physics, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113; E-mail(MT): ), AC(Department of Physics, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113; E-mail(MT): ), AD(Department of Physics, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113; E-mail(MT): ), AE(The Institute of Physical and Chemical Research, 2-1 Hirosawa, Wako, Saitama 351-01), AF(The Institute of Physical and Chemical Research, 2-1 Hirosawa, Wako, Saitama 351-01), AG(The Institute of Physical and Chemical Research, 2-1 Hirosawa, Wako, Saitama 351-01), AH(The Institute of Physical and Chemical Research, 2-1 Hirosawa, Wako, Saitama 351-01), AI(The Institute of Physical and Chemical Research, 2-1 Hirosawa, Wako, Saitama 351-01), AJ(The Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229), AK(Department of Physics, Faculty of Science, Tokyo Metropolitan University, 1-1 Minami-Ohsawa, Hachioji, Tokyo 192-03)
Publication:
Publ. of the Astronomical Society of Japan, v.49, p.631-637. (PASJ Homepage)
Publication Date:
12/1997
Origin:
PASJ
PASJ Keywords:
BL LACERTAE OBJECTS, GALAXIES: INDIVIDUAL (OJ 287), X-RAYS: SPECTRA
Bibliographic Code:
1997PASJ...49..631I

Abstract

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.

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