Long-term spectral variation of 3C 66A with Fermi and Kanata
Abstract
3C 66A is an intermediate-frequency peaked BL Lac object detected in the gamma-ray energy band. We have studied the long-term GeV and optical variation of 3C 66A using the Fermi Large Area Telescope (LAT) and the Kanata Telescope. We observed two types of variations. In 2008, the gamma-ray flux, optical flux, optical color, and optical polarization degree show a clear correlation. On the other hand, in 2009-2010, the correlation becomes quite weak; only the optical flux gradually increased. These properties might be explained by two emission regions; one close to the source of Comptonized seed photons, and the other distant.
- Publication:
-
The First Year of MAXI: Monitoring Variable X-ray Sources
- Pub Date:
- December 2010
- Bibcode:
- 2010fym..confP..44I