Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26as..119..199z&link_type=abstract
Astronomy and Astrophysics Supplement, v.119, p.199-203
Astronomy and Astrophysics
Astrophysics
2
Bl Lac Objects: Individual: Oj 287, Infrared: Galaxies
Scientific paper
The paper presents the first evidence for the long-term near-infrared brightness, colour and spectral variability in the BL Lac object OJ 287. It had an infrared outburst of large amplitude during the beginning of 1983. The J-K colour index increased linearly, and infrared spectrum also linearly steepened during the years 1975-1990. After then, both the J-K colour and spectral index began to recover. Both the J-K colour and the near-infrared spectral index shows also a strong correlation with the flux intensity, in the sense that when OJ 287 is fainter, J-K is larger, and the near-infrared spectrum steeper. These properties show a very important similarity with the optical data of OJ 287 from the same time interval (Takalo & Sillanpaeae 1989). Our results argue that a single variable synchrotron source might be responsible for the photometric behaviour of OJ 287 in the near-infrared and optical regions.
Xie G.-Zh.
Zhang Ying Hui
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