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  • optical variability of mrk 421

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
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     we observed mrk 421 in v and r band using the 1.0 m telescope at weihai observatory of shandong university since 2009 april to 2012 may. the available historical data in b and v band were also assembled for constructing light curves. the brightness of mrk 421 ranges from 11.40 to 16.14 in the b band light curve, and from 11.38 to 14.56 in the v band. analyses with the jurkevich method and the structure function method showed a possible period of about 1.36 years for its long periodic variability. this period could be explained by a close binary black hole system (bbhs) model with a primary black hole mass of 1.70×108 m  and a secondary ∼(0.49–2.9)×107 m . we showed the color variability of mrk 421, a bluer when brighter behavior during its lower state. analyses of spectral index variations show that only a host galaxy contribution is not sufficient to explain the spectral index variations in mrk 421, and some intrinsic mechanism is needed.

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