Physics
Scientific paper
Aug 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aipc.1357..257d&link_type=abstract
RADIO PULSARS: AN ASTROPHYSICAL KEY TO UNLOCK THE SECRETS OF THE UNIVERSE. AIP Conference Proceedings, Volume 1357, pp. 257-260
Physics
Stellar Rotation, Radio, Explosions, Radio Telescopes, Stellar Rotation, Radio, Microwave, Energetic Particles, Radio Telescopes And Instrumentation, Heterodyne Receivers
Scientific paper
Fermi-LAT and AGILE have already detected more than 70 rotation-powered pulsars at GeV energies, opening a new era of pulsar physics. In particular, Fermi has unveiled the existence of a large population of Geminga-like pulsars, γ-ray bright but radio-silent. We used XMM-Newton, Chandra and Swift to study such new, γ-ray selected, pulsar population and to compare its X-ray behaviour with that of the radio pulsars. While radio-loud and radio-quiet pulsars need not to be different objects, their different viewing geometry with respect to the observer does influence the ratio between γ and X-ray emissions. When plotting the distance-indipendent γ to X-ray flux ratios as a function of the pulsars' rotational energy losses, one immediately sees that pulsars with similar energetics have Fγ/FX spanning 3 decades. Such spread, most probably stemming from vastly different geometrical configurations of the X and γ-ray emitting regions, defies any straightforward interpretation of the plot. We find that, on average, radio-quiet pulsars do have higher values of Fγ/FX, implying an intrinsec faintness of their X-ray emission and/or a different geometrical configuration.
Caraveo Patricia A.
de Luca Antonio
Marelli Martino
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