A Study of Magnetic Field by Using Core Shift for Radio Galaxy 3C - PowerPoint PPT Presentation

A Study of Magnetic Field by Using Core Shift for Radio Galaxy 3C 111 K.Shiotani , K.Fujisawa, K.Niinuma (Yamaguchi univ.)

Introduction

AGN Jets SMBH Lobe Relativistic jet (Γ~10) Cygnus A radio image for VLA(Image courtesy of NRAO) A lot of issues has not been clarified a few kpc ~ Mpc How collimate? How accelerate? ∼ 10 40 • Powerful energy emission ( erg/s) from very compact region • Radio to γ-ray emission ; Synchrotron + Inverse Compton • Collimated plasma flow with relativistic velocity

Magnetically Driven Model ⇨magnetically driven model is a most likely model J.McKinney 2006 Important to estimate the magnetic field strength of the jet of pc or less scale for more realistic simulation 宇宙ジェットの磁気駆動モデルのコンピュータシミュレーション • Helical magnetic field・Synchrotron radiation・high speed jet (http://home.hiroshima-u.ac.jp/hasc/news/3c279/index.html , Shibata and Uchida 1986)

Motivation Estimating physical parameters (especially the magnetic field) at the pc scale from the observation, constraining the theoretical model Magnetic field can not be measured directly . . . “ Core shift ” gives us indirect measurement of magnetic field

Method & Target