Time variation of the rotation measure gradient in the 3C 273 jet

被引：36

作者：

Asada, Keiichi ^{[1
,2
,4
]}

Inoue, Makoto ^{[1
]}

Kameno, Seiji ^{[1
,3
]}

Nagai, Hiroshi ^{[1
,4
]}

机构：

[1] Natl Astron Observ Japan, Mitaka, Tokyo, Japan

[2] Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Sagamihara, Kanagawa 2298510, Japan

[3] Kagoshima Univ, Fac Sci, Dept Phys, Kagoshima 8900065, Japan

[4] Grad Univ Adv Studies, Dept Astron Sci, Mitaka, Tokyo 1818588, Japan

来源：

ASTROPHYSICAL JOURNAL | 2008年 / 675卷 / 01期

关键词：

galaxies : active; galaxies : jets; quasars : individual (3C 273);

D O I：

10.1086/524000

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The existence of a gradient in the Faraday rotation measure (RM) of the quasar 3C 273 jet is confirmed by follow-up observations. A gradient transverse to the jet axis is seen for more than 20 mas in projected distance. Taking account of the viewing angle, we estimate it to be more than 100 pc. Comparing to the distribution of the RM in 1995, we detect a time variation of it at the same distance from the core over 7 yr. We discuss the origin of the Faraday rotation based on this rapid time variation. We rule out foreground media such as a narrow-line region, and suggest a helical magnetic field in the sheath region as the origin of this gradient of the RM.

引用

页码：79 / 82

页数：4

共 13 条

[1] A helical magnetic field in the jet of 3C 273 [J].