DISCOVERY OF A WANDERING RADIO JET BASE AFTER A LARGE X-RAY FLARE IN THE BLAZAR MARKARIAN 421

被引：11
|
作者：
Niinuma, K. [1 ]
Kino, M. [2 ]
Doi, A. [3 ]
Hada, K. [4 ]
Nagai, H. [5 ]
Koyama, S. [6 ]
机构：
[1] Yamaguchi Univ, Grad Sch Sci & Engn, Yamaguchi, Yamaguchi 7538512, Japan
[2] Korea Astron & Space Sci Inst, Korean VLBI Network, Taejon 305348, South Korea
[3] Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Chuou Ku, Sagamihara, Kanagawa 2298510, Japan
[4] Natl Astron Observ Japan, Mizusawa VLBI Observ, Mitaka, Tokyo 1818588, Japan
[5] Natl Astron Observ Japan, Chile Observ, Mitaka, Tokyo 1818588, Japan
[6] Max Planck Inst Radioastron, D-53121 Bonn, Germany
来源：
ASTROPHYSICAL JOURNAL LETTERS | 2015年 / 807卷 / 01期
关键词：
BL Lacertae objects: individual (Markarian 421); galaxies: active; galaxies: jets; ACTIVE GALACTIC NUCLEI; INTERNAL SHOCKS; PROPER MOTION; KINEMATICS; ASTROMETRY; LOCATION; QUASARS; STATE; M87;
D O I：
10.1088/2041-8205/807/1/L14
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We investigate the location of the radio jet bases ("radio cores") of blazars in radio images and their stationarity by means of dense very long baseline interferometry (VLBI) observations. In order to measure the position of a radio core, we conducted a 12 epoch astrometric observation of the blazar Markarian 421 with the VLBI Exploration of Radio Astrometry at 22 GHz immediately after a large X-ray flare, which occurred in the middle of 2011 September. For the first time, we find that the radio core is not stationary but rather changes its location toward 0.5 mas downstream. This angular scale corresponds to the de-projected length of a scale of 10(5) Schwarzschild radii (R-s) at the distance of Markarian 421. This radio-core wandering may be a new type of manifestation associated with the phenomena of large X-ray flares.
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页数：5
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