Host: Dong Lai

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Abstract:

I will present an effective synchro-curvature model versatile enough to be applied to hundreds of pulsars. The model follows the dynamics of charged particles being accelerated in the magnetosphere of a pulsar and computes their emission via synchro-curvature radiation, with only three free effective parameters involved. The model has succeeded in fitting the gamma-ray spectra of the whole population of gamma-ray pulsars and reproduces well those pulsars that also have detected non-thermal X-ray pulsations. Complementary to the spectral model, for which we have incorporated several improvements related to the description of the acceleration region, a geometrical representation allows us to build synchro-curvature emission maps from which light curves can be obtained. The sample of theoretical light curves created presents very similar morphological features to the zoo of observational gamma-ray light curves of pulsars observed. We find a general agreement in global properties and extract several main conclusions: 1) that the detection probability due to beaming is much higher for orthogonal rotators (approaching 100 per cent) than for small inclination angles (less than 20 per cent). 2) that the small variation in the synthetic skymaps generated for different pulsars indicates that geometry dominates over timing and spectral properties in shaping the gamma-ray light curves 3) that the global observed statistics of the light curves follow the same trend as that obtained from single pulsars when considering all the LCs it can in principle produce. The latter implies that a set of synthetic light curves produced for a fixed set of best-fit spectral parameters but varying the geometry (inclination, observer line of sight) is also representative of the global set of all observed pulsars, for which the values of such angles are also randomly distributed. The model has been used to concurrently fit spectra and light curves of all Fermi-LAT pulsars contained in the 3PC, deriving and analyzing new fitting methodologies.

Biography:

I am an ICREA Professor of Astrophysics based at the Institute of Space Sciences. I was born in Buenos Aires, Argentina. I studied there up to obtaining my doctoral degree in physics from the National University at La Plata, working on cosmology and astrophysics of extended gravitational theories. After several fellowships (Astronomy Centre of Sussex University in UK, Institute for Radioastronomy in Argentina, Princeton University and the Lawrence Livermore Laboratory in the USA) and some stays in Italy (International Center for Theoretical Physics at Trieste, Salerno University at Baronissi), I moved to Barcelona right at the end of 2005 to work at the Institute of Space Sciences and start a research group on high-energy astrophysics.