Polarization of Cluster Radio Sources with LOFAR

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Presentation transcript:

Polarization of Cluster Radio Sources with LOFAR Federica Govoni Matteo Murgia (INAF – Osservatorio Astronomico di Cagliari, Italy) COLLABORATORS: Luigina Feretti (INAF – Istituto di Radioastronomia, Italy) Gabriele Giovannini (Dip. Astronomia, Univ. Bologna, Italy) Emmen (NL) 23 – 27 April 2007

Outline of the Talk Three-dimensional cluster magnetic field models FARADAY program Murgia et al. (2004) Abell 2255 Govoni et al. (2005, 2006) Radio Halo intensity and polarization Rotation Measure Radio Halos expectations with LOFAR RM expectations of radio galaxies with LOFAR

3-Dimensional multi-scale cluster magnetic field models Parameters of the magnetic field model: MAGNETIC FIELD SCALES POWER SPECTRUM SPECTRAL INDEX MAGNETIC FIELD STRENGTH RADIO HALO EMISSION ROTATION MEASURE OF RADIO GALAXIES

3-Dimensional multi-scale cluster magnetic field models RADIO HALO EMISSION

3-Dimensional multi-scale cluster magnetic field models ROTATION MEASURE IMAGES Murgia et al. 2004

ABELL 2255 Relic Halo VLA 5 - 8 GHz, Beam 2” VLA 1.4 GHz, Beam 25” Govoni et al. 2006 VLA 5 - 8 GHz, Beam 2” VLA 1.4 GHz, Beam 25” Govoni et al. 2005 See also Pizzo R. talk

ABELL 2255 RADIO HALO EMISSION Power spectrum spectral index: n=2 at the cluster center n=4 at the cluster periphery Magnetic field strength at the center 2.5µG Govoni et al. 2006

ABELL 2255 ROTATION MEASURE IMAGES OBSERVED SIMULATED Govoni et al. 2006

RADIO HALOS WITH LOFAR SIMULATIONS Bright Halo Faint Halo

RADIO HALOS WITH LOFAR

RADIO HALOS WITH LOFAR

RADIO HALOS WITH LOFAR

RADIO HALOS WITH LOFAR

RADIO HALOS WITH LOFAR

RADIO HALOS WITH LOFAR

RADIO HALOS WITH LOFAR

RADIO HALOS WITH LOFAR

RADIO HALOS WITH LOFAR

RADIO HALOS WITH LOFAR

RADIO HALOS WITH LOFAR

RADIO HALOS WITH LOFAR

RADIO HALOS WITH LOFAR

RADIO HALOS WITH LOFAR

RADIO HALOS WITH LOFAR

RADIO HALOS WITH LOFAR

POLARIZATION OF RADIO HALOS FRACTIONAL POLARIZATION FRACTIONAL POLARIZATION

POLARIZATION OF RADIO HALOS

ROTATION MEASURE OF RADIO GALAXIES

Conclusions Radio Halos expectations with LOFAR: LOFAR will be an extraordinary instrument to study the morphology of bright radio halos at very low frequencies; Thanks to its arcsecond-resolution there could be a chance to detect polarized emission at levels of few % at least at 240 MHz. RM expectations of radio galaxies with LOFAR: LOFAR will produce detailed RM images for hundred of radio sources into (or in background to) a cluster of galaxies. This will permit to determine the power spectrum of the magnetic field fluctuations for a large number of clusters of galaxies.