(More) Evidence of Disk-Jet Connection in the Radio Galaxy

3C 120

Ritaban Chatterjee, Boston University. Radio Galaxies in the Chandra Era,

July 11th, 2008.

Disk-Jet connection in 3C 120 (Past)

Marscher et al. (2002)

Multi-wavelength Light Curves of 3C 120 between 2002 and 2007

X-ray/37 GHz Anti-correlation (X-ray leads 37GHz by 120 days)

Modeling of Radio Data : Decomposition into Flares

Baseline through Yearly Mean

Modeling of the Dips in the X-ray

X-ray Dips and 37 GHz Flares

Area under the Curve of Radio Flares vs. Depth of the X-ray Dips

Possible Explanation of the X-ray Dip and Superluminal Ejection Correlation

1. Change in the magnetic field configuration in the accretion disk from turbulent to aligned => absence of viscous heating causes dips in X-ray production => aligned B field configuration facilitates shock to move towards the jet (Livio et al. 2003)

2. Corona is the base of the jet => decrease in the number density of electrons at the base of the jet => causes X-ray dips and increase in the speed of particles (continuity eqn.) => causes shock wave.

Multi-wavelength Light Curves of 3C 120 between 2002 and 2007

X-ray/Optical Correlation (X-ray leads Optical R band by 10 days)

Origin of Optical Emission

Jet• Polarization ≤ 0.3%

• Radio outbursts in the jet anti-correlates with X-ray.

Accretion disk• Excellent correlation

with the X-ray with ≤ 10 days time lag