Matteo Murgia

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Aims. The goal of this work is to put constraints on the strength and structure of the magnetic field in the cluster of galaxies A2382. We investigate the relationship between magnetic field and Faraday rotation effects in the cluster, using numerical simulations as a reference for the observed polarization properties. Methods. For this purpose we present(More)
Deep Very Large Array radio observations confirm the presence of halo and relic sources in six clusters of galaxies (A115, A520, A773, A1664, A2254, A2744) where a wide diffuse emission was previously found in the NRAO VLA Sky Survey. New images at 1.4 GHz of these six clusters of galaxies are presented and X-ray data obtained from the ROSAT archive are(More)
We present a numerical approach to investigate the relationship between magnetic fields and Faraday rotation effects in clusters of galaxies. We can infer the structure and strength of intra-cluster magnetic fields by comparing our simulations with the observed polarization properties of extended cluster radio sources such as radio galaxies and halos. We(More)
After a brief introduction to the morphological properties of FRI radio sources, we discuss the possibility that FRI jets are relativistic at their bases and decelerate quickly to non-relativistic velocities. From two-frequency data we determine spectral index distributions and consequently the ages of FRI sources. We show that in the large majority of(More)
We are developing a new approach to investigate cluster magnetic field strengths and structures. It is based on the comparison of simulated Rotation Measure and radio halo images, obtained from 3dimensional multi-scale cluster magnetic fields models, with observations. This approach is applied to A2255 in which wide diffuse radio emissions and Rotation(More)
We describe the results of the highest-resolution radio observations yet made of four relic radio sources in the Abell clusters A13, A85, A133 and A4038. Our VLA images at 1.4 GHz with 4′′ resolution and a noise level of 1 σ ∼ 20 μJy beam−1 (1.1 K) show a remarkable variety of fine structure in the form of spectacular arcs, wisps, plumes and loops. Their(More)
We have performed momentum dependent electron energy-loss studies of the electronic excitations in sexithiophene and compared the results to those from parent oligomers. Our experiment probes the dynamic structure factor S(q, ω) and we show that the momentum dependent intensity variation of the excitations observed can be used to extract the size of the(More)
Gabriele Giovannini1,2, Annalisa Bonafede3, Shea Brown4, Luigina Feretti1, Chiara Ferrari5, Myriam Gitti1,2, Federica Govoni6, Matteo Murgia6, Valentina Vacca7 1Istituto di Radioastronomia/INAF (BO), I; 2Dipartimento di Fisica e Astronomia, Bologna University, I; 3Hamburger Sternwarte, Universitat, D; 4Iowa University, USA; 5Lagrange Laboratory, OCA, F;(More)