Sabato 26 Gennaio p.v., il professor Polcaro terrà una conferenza all’osservatorio Virginio Cesarini a Frasso Sabino.
La conferenza esaminerà come si è evoluto il concetto di tempo dell’umanità, partendo da quello delle prime tribù di cacciatori-raccoglitori della Preistoria (come si è potuto ricavare da studi archeologici ed antropologici), per arrivare a quello della fisica moderna, discutendo brevemente l’evoluzione che questo concetto ha attraversato dalle prime civiltà urbane alla filosofia classica e successivamente dal Medioevo al Rinascimento ed alla fisica newtoniana.
The AGN unified scenario suggests that the Seyfert 2 galaxies are the
obscured counterparts of Seyfert 1 galaxies where the difference is
caused only by the orientation of the object. Optical microvariability
is supposed to arise from the regions which are closer to the
supermassive black hole at the center of the AGN. The search for
microvariability is an important test for the AGN unified scenario,
since we assume that the variability of obscured AGNs should be
happening on long time scales (compared to the unobscured AGNs). We
present first results from the microvariability campaign…
We report on the spectroscopic observations of the 2011 outburst of the
Recurrent Nova T Pyx. The observations were obtained over the first two
months of the outburst and they were made using two different high
resolution echelle spectrographs: VLT-XSHOOTER and TNG-SARG. The first
observation was obtained one day after the discovery of the outburst, so
that we were able to follow the evolution of the nova from the very
early emission before the maximum luminosity of the nova. Such early
observation allowed us to detect the transition of the nova spectral
emission from a He-N to a Fe II…
