| Charge coupled devices （CCD） photometry and long-term optical variability of gamma-ray-loud BL Lacertae object Mkn 421 |
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| 引用本文： | 张雄,郑永刚,张皓晶,胡绍明,谢照华.Charge coupled devices （CCD） photometry and long-term optical variability of gamma-ray-loud BL Lacertae object Mkn 421[J].中国物理 B,2006,15(9):2185-2192. |
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| 作者姓名： | 张雄 郑永刚 张皓晶 胡绍明 谢照华 |
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| 作者单位： | Department of Physics, Yunnan Normal University, Kunming 650092, China;Department of Physics, The University of Hong Kong, China;Department of Physics, Yunnan Normal University, Kunming 650092, China;National Astronomical Observatory, Chinese Academy of Sciences, Beijing 100012 ,China;National Astronomical Observatory, Chinese Academy of Sciences, Beijing 100012 ,China;Department of Physics, Yunnan Normal University, Kunming 650092, China |
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| 基金项目： | 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 △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.
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| 关 键 词： | 光度学 黑洞中心质量 色索引 天体物理学 |
| 收稿时间： | 2006-01-12 |
| 修稿时间： | 2006-01-122006-05-15 |
Charge coupled devices (CCD) photometry and long-term optical variability of gamma-ray-loud BL Lacertae object Mkn 421 |
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| Zhang Xiong,Zheng Yong-Gang,Zhang Hao-Jing,Hu Shao-Ming and Xie Zhao-Hua.Charge coupled devices (CCD) photometry and long-term optical variability of gamma-ray-loud BL Lacertae object Mkn 421[J].Chinese Physics B,2006,15(9):2185-2192. |
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| Authors: | Zhang Xiong Zheng Yong-Gang Zhang Hao-Jing Hu Shao-Ming and Xie Zhao-Hua |
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| Affiliation: | 1. Department of Physics, Yunnan Normal University, Kunming 650092, China ; 2. National Astronomical Observatory, Chinese Academy of Sciences, Beijing 100012 ,China ; 3. Department of Physics, The University of Hong Kong, China |
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| 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. |
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| Keywords: | BL Lac object Mkn 421 photometry mass of central black hole colour index |
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