The preliminary results obtained by the GRAAL collaboration for the π0π+ photoproduction on the free and quasi-free proton (deuteron) at Eγ = 0.7-1.5 GeV are presented. The total cross section of the γp → π0π+n reaction and invariant mass spectra for the π+π0, π+n and π0n systems are presented in the photon energy range from 0.7 to 1.5 GeV. These

We present the results from the analysis of the optical broadband and X-ray properties of a large sample of active galactic nuclei (AGN) in the Groth-Westphal Strip (GWS) field. The description of the observational material and data processing is described in a separate paper (see Pović et al. 2009, in this volume). Here the main findings are

We present results from the study of optical broadband and X-ray properties of a large sample of active galactic nuclei (AGN) in the Groth-Westphal Strip (GWS) field. In order to determine the morphology of all objects, we obtained different structural parameters. Combining these parameters with other optical/X-ray properties, we were searching for

OSIRIS, the optical Day One instrument for the GTC, will shortly be shipped to La Palma to start the commissioning at the telescope. Some results of the final laboratory characterization of the instrument are shown, together with the upgrades that are planned to be operational after Day One. Several large programs using the OSIRIS Tunable Filters

A particularly interesting line for exploring the physical conditions of the quiet solar chromosphere is Halpha , but its intensity profile is magnetically insensitive and the small circular polarization signatures produced by the longitudinal Zeeman effect come mainly from the underlying photosphere. Here we show that the Hanle effect in Halpha

We explore the photospheric and chromospheric magnetic field in an emerging flux region. An image of the equivalent width of the He I 10830 Å red blended component shows the presence of filamentary structures that might be interpreted as magnetic loops. We point out that the magnetic field strength in the chromosphere resembles a smoothed version