Revisiting LS I+61°303 with VLBI astrometry

被引：10
作者：
Wu, Y. W. [1 ,2 ]
Torricelli-Ciamponi, G. [3 ]
Massi, M. [4 ]
Reid, M. J. [5 ]
Zhang, B. [6 ]
Shao, L. [7 ]
Zheng, X. W. [8 ]
机构：
[1] Natl Astron Observ Japan, Osawa 2-21-1, Mitaka, Tokyo 1818588, Japan
[2] Chinese Acad Sci, Key Lab Precise Positioning & Timing Technol, Natl Time Serv Ctr, Xian 710600, Shaanxi, Peoples R China
[3] INAF Osservatorio Astrofis Arcetri, Lgo E Fermi 5, I-50125 Florence, Italy
[4] Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany
[5] Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA
[6] Shanghai Astron Observ, 80 Nandan Rd, Shanghai 20030, Peoples R China
[7] Albert Einstein Inst, Max Planck Inst Gravitat Phys, Muhlenberg 1, D-14476 Potsdam, Germany
[8] Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2018年 / 474卷 / 03期
关键词：
stars: jets; gamma-rays: stars; radio continuum: stars; X-rays: binaries; X-rays: individual: LS I+61 degrees 303; BLACK-HOLE; RADIO; EMISSION; ORIGIN;
D O I：
10.1093/mnras/stx3003
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We conducted multi-epoch Very Long Baseline Array (VLBA) phase-referenced observations of LS I + 61 degrees 303 in order to study its precessing radio jet. Compared to similar observations in 2006, we find that the observed elliptical trajectory of emission at 8.4 GHz repeats after the 9 yr gap. The accurate alignment of the emission patterns yields a precession period of 26.926 +/- 0.005 d, which is consistent with that determined by Lomb-Scargle analysis of the radio light curve. We analytically model the projection on the sky plane of the peak position of a precessing, synchrotron-emitting jet, which traces an elliptical trajectory on the sky. Comparing the simulation with the VLBA astrometry we improve our knowledge of the geometry of the system. We measure the LS I + 61 degrees 303 absolute proper motion to be -0.150 +/- 0.006 mas yr(-1) eastward and -0.264 +/- 0.006 mas yr(-1) northward. Removing Galactic rotation, this reveals a small, < 20 km s(-1), non-circular motion, which indicates a very low kick velocity when the black hole was formed.
引用
收藏
页码：4245 / 4253
页数：9
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