中国物理B ›› 2006, Vol. 15 ›› Issue (9): 2185-2192.doi: 10.1088/1009-1963/15/9/047

• • 上一篇    

Charge coupled devices (CCD) photometry and long-term optical variability of gamma-ray-loud BL Lacertae object Mkn 421

郑永刚1, 谢照华1, 张雄2, 张皓晶3, 胡绍明3   

  1. (1)Department of Physics, Yunnan Normal University, Kunming 650092, China; (2)Department of Physics, Yunnan Normal University, Kunming 650092, China;Department of Physics, The University of Hong Kong, China; (3)National Astronomical Observatory, Chinese Academy of Sciences, Beijing 100012 ,China
  • 收稿日期:2006-01-12 修回日期:2006-05-15 出版日期:2006-09-20 发布日期:2006-09-20
  • 基金资助:
    Project supported by an CRCG grant of the University of Hong Kong, Yunnan Provincial Foundation of Science of China \linebreak \makebox[1.6mm]{}(Grant No 2004A0027M) and the National Natural Science Foundation of China(Grant No 10363002), and the Natural Science\linebreak \makebox[1.6mm]{}Foundation of China Education Department(Grant No 02142).

Charge coupled devices (CCD) photometry and long-term optical variability of gamma-ray-loud BL Lacertae object Mkn 421

Zhang Xiong(张雄)a)c)†, Zheng Yong-Gang(郑永刚)a), Zhang Hao-Jing(张皓晶)b), Hu Shao-Ming(胡绍明)b), and Xie Zhao-Hua(谢照华)a)   

  1. a Department of Physics, Yunnan Normal University, Kunming 650092, China; b National Astronomical Observatory, Chinese Academy of Sciences, Beijing 100012, China; c Department of Physics, The University of Hong Kong, China
  • Received:2006-01-12 Revised:2006-05-15 Online:2006-09-20 Published:2006-09-20
  • Supported by:
    Project supported by an CRCG grant of the University of Hong Kong, Yunnan Provincial Foundation of Science of China \linebreak \makebox[1.6mm]{}(Grant No 2004A0027M) and the National Natural Science Foundation of China(Grant No 10363002), and the Natural Science\linebreak \makebox[1.6mm]{}Foundation of China Education Department(Grant No 02142).

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摘要： Evidence for the long-term optical curve variability and colour behaviour of the BL Lac object Mkn 421 is presented. Our results show that the amplitude of the optical variations of Mkn 421 is only about {\Delta} B=4.7 magnitude in the B-band for its photometric history from 1899 to 2002. The results of optical photometric monitoring of the Mkn 421 from April 2000 to Jan 2002 are provided. During our observation, Mkn 421 shows significant rapid variations and exhibits short time variability of 2.42 hours in the B band. A strong correlation between the B-V colour index and the magnitude in the B band is found. Our charge coupled device (CCD) photometry of Mkn 421 shows that the measured results are in good agreement with the predicted optical variability period of about 23 years.

关键词: BL Lac object Mkn 421, photometry, mass of central black hole, colour index

Abstract: Evidence for the long-term optical curve variability and colour behaviour of the BL Lac object Mkn 421 is presented. Our results show that the amplitude of the optical variations of Mkn 421 is only about $\Delta B=4.7$ magnitude in the B-band for its photometric history from 1899 to 2002. The results of optical photometric monitoring of the Mkn 421 from April 2000 to Jan 2002 are provided. During our observation, Mkn 421 shows significant rapid variations and exhibits short time variability of 2.42 hours in the B band. A strong correlation between the B-V colour index and the magnitude in the B band is found. Our charge coupled device (CCD) photometry of Mkn 421 shows that the measured results are in good agreement with the predicted optical variability period of about 23 years.

Key words: BL Lac object Mkn 421, photometry, mass of central black hole, colour index

中图分类号:  (Winds and their effects)

  • 92.60.Gn
92.10.Hm (Ocean waves and oscillations) 92.10.Kp (Sea-air energy exchange processes) 92.05.Hj (Physical and chemical properties of seawater) 84.40.Xb (Telemetry: remote control, remote sensing; radar)