High-resolution observations of powerful radio sources Monica Orienti Almudena Prieto 13/12/2007 Monica Orienti – IAC.

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Presentation transcript:

High-resolution observations of powerful radio sources Monica Orienti Almudena Prieto 13/12/2007 Monica Orienti – IAC

Outline 1.Powerful radio sources 2.Hot-spot 3.Young radio sources

1.Powerful radio sources L 1.4 GHz > W/Hz Size: from pc to a few Mpc Elliptical galaxies and quasars; 10% of AGN population 1.04 Mpc

Radio morphology Core Jet Hot spot Lobe Hot spot Cygnus A 1. Powerful radio sources

The central component B P  E 2 B 2  E 2 B e-e- Synchrotron radiation 1. Powerful radio sources

The external component Reacceleration in the hot-spots Electrons are deposited in the lobes where they age: t syn  10 8 years Transient phenomenon Jet Hot-spot Lobe 1. Powerful radio sources

Synchrotron radiation B e-e- P  E 2 B 2  E 2 B S   S   0.5 br S br  B -3 t -2

2. Hot-spot S   S   0.5 br S br  B E 2 t syn  br -1/2 B -3/2

Sample selection - 9 hot-spots observed with VLA and VLT with high-resolution < 1” - All hot-spots are characterized by: Low magnetic field Low radio power 2. Hot-spot

Results 4 hot-spots (  45%) detected 3 hot-spots show extended optical emission 2. Hot-spot

The goal What originates the extended features? 2. Hot-spot

3. Young radio sources LLS < 1 kpc; P 1.4 GHz > W/Hz; t ~ 10 3 – 5 yr 300 pc

The ISM and the source growth Strong flux-density and arm- length asymmetries in compact (< 15 kpc) radio sources 3. Young radio sources

The goal How the ambient medium influences the source growth? Evidence of jet-cloud interaction? 3. Young radio sources

Seyfert galaxies Usually not powerful in radio Unresolved non-thermal component in the centre High-resolution radio observations to characterize the SED of the central region (A. Prieto, J. Acosta, J.A. Fernandez-Ontiveros)