First year observation of Geminga pulsar with Fermi-LAT

Details First year observation of Geminga pulsar with Fermi-LAT First year observation of Geminga pulsar with Fermi-LAT

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010apsp.conf..765g&link_type=abstract

ASTROPARTICLE, PARTICLE AND SPACE PHYSICS, DETECTORS AND MEDICAL PHYSICS APPLICATIONS. Proceedings of the 11th Conference. Held

Physics

Medical Physics

Gamma Rays: Observation, Pulsar: General, Pulsar: Individual (Psrj0633+1746, Geminga)

Scientific paper

Geminga is a neutron star approximately 250 pc away from the Sun in the Gemini constellation . It was first discovered in 1975 by NASA's Second Small Astronomy Satellite (SAS-2), but only in 1992 the ROSAT satellite detected a periodicity of 0.237 seconds in soft x-ray emission, typical of the pulsars. Pulsed gamma-rays were detected by EGRET on CGRO in 1992. The EGRET measurement of the Geminga emission spectrum was compatible with a power law shape with a fall-off above energies of 2 GeV, although the cutoff energy of the emission could not be determined due to limited statistics at these energies. Even though Geminga has been one of the most intensively studied isolated neutron star during the last thirty years, its interest remains intact, especially at gamma-ray energies where its narrow-peaked light curve allows precise timing studies with a high-sensitivity instrument like the Large Area Telescope (LAT) onboard the Fermi mission. Following its launch, Fermi confirmed to be an excellent instrument for pulsar studies. Thanks to the excellent statistics collected, to the high energy resolution and the impressive timing resolution of the Fermi-LAT, we have improved our knowledge about the gamma emission from this pulsar. We have confirmed and measured the cut off energy in the spectrum, barely seen by EGRET. We have also built a very precise timing solution using only gamma-ray data from the LAT itself and this has allowed a deep study of light curves changes with energy and a phase resolved spectral analysis. We report on the preliminary results obtained.

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