Long-term spectral variation of 3C 66A with Fermi and Kanata

Details Long-term spectral variation of 3C 66A with Fermi and Kanata Long-term spectral variation of 3C 66A with Fermi and Kanata

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010fym..confp..44i&link_type=abstract

"The First Year of MAXI: Monitoring Variable X-ray Sources", Poster Presentations, 4th International MAXI Workshop held November

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Scientific paper

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.

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