The 2006 radio outbursts of a microquasar Cygnus X-3: Observations and data

被引:8
|
作者
Tsuboi, Masato [1 ]
Tosaki, Tomoka [1 ]
Kuno, Nario [1 ]
Nakanishi, Kouichiro [1 ]
Sawada, Tsuyoshi [1 ]
Umemoto, Tomofumi [1 ]
Trushkin, Sergei A. [2 ]
Kotani, Taro [3 ]
Kawai, Nobuyuki [3 ]
Kurono, Yasutaka [4 ]
Handa, Toshihiro [4 ]
Kohno, Kotaro [4 ]
Tsukagoshi, Takashi [5 ]
Kameya, Osamu [6 ]
Kobayashi, Hideyuki [6 ]
Fujisawa, Kenta [7 ]
Doi, Akihiro [7 ]
Omodaka, Toshihiro [8 ]
Takaba, Hiroshi [9 ]
Sudou, Hiroshi [9 ]
Wakamatsu, Ken-ichi [9 ]
Koyama, Yasuhiro [10 ]
Kawai, Eiji [10 ]
Mochizuki, Nanako [11 ]
Murata, Yasuhiro [11 ]
机构
[1] Nobeyama Radio Observ, Minamisa Ku, Nagano 3841305, Japan
[2] RAS, Special Astrophys Observ, Nizhnii Arkhyz 369167, Karachaevo Cher, Russia
[3] Tokyo Inst Technol, Dept Phys, Meguro Ku, Tokyo 1528551, Japan
[4] Univ Tokyo, Sch Sci, Inst Astron, Tokyo 1818588, Japan
[5] Grad Univ Adv Studies Sokendai, Tokyo 1818588, Japan
[6] Natl Inst Nat Sci, Natl Astron Observ Japan, Mizusawa VERA Observ, Mizusawa, Iwate 0230861, Japan
[7] Yamaguchi Univ, Fac Sci, Yamaguchi 7538512, Japan
[8] Kagoshima Univ, Fac Sci, Kagoshima 8900065, Japan
[9] Gifu Univ, Fac Engn, Gifu 5011193, Japan
[10] Natl Inst Informat & Commun Technol, Kashima Space Res Ctr, Ibaraki 3148501, Japan
[11] JAXA, Inst Space & Astronaut Sci, Kanagawa 2298510, Japan
基金
日本学术振兴会;
关键词
black hole physics; radio continuum : stars; stars : variables : other;
D O I
10.1093/pasj/60.3.465
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present the results of multi-frequency observations of radio outbursts of the microquasar Cygnus X-3 in 2006 February and March with the Nobeyama 45-m telescope, the Nobeyama Millimeter Array, and the Yamaguchi 32-m telescope. Since the prediction of a flare by RATAN-600, the source was monitored from January 27 (UT) with these radio telescopes. At the eighteenth day after the quench of activity, successive flares exceeding 1 Jy were successfully observed. The time scale of the variability in the active phase is presumably shorter in higher frequency bands. We also present the result of a follow-up VLBI observation at 8.4 GHz with the Japanese VLBI Network 2.6 d after the first rise. A VLBI image exhibits a single core with a size of < 8 mas (80 AU). The observed image is almost stable, although the core shows a rapid variation in the flux density. No jet structure can be seen at a sensitivity of T-b (brightness temperature) = 7.5 x 10(5) K.
引用
收藏
页码:465 / 473
页数:9
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