Suzaku Observation of a White Dwarf as a new Candidate of Cosmic-ray Origin

Details Suzaku Observation of a White Dwarf as a new Candidate of Cosmic-ray Origin Suzaku Observation of a White Dwarf as a new Candidate of Cosmic-ray Origin

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1085..689t&link_type=abstract

HIGH ENERGY GAMMA-RAY ASTRONOMY: Proceedings of the 4th International Meeting on High Energy Gamma-Ray Astronomy. AIP Conferenc

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Faint Blue Stars, White Dwarfs, Degenerate Stars, Nuclei Of Planetary Nebulae, Neutrino, Muon, Pion, And Other Elementary Particles, Cosmic Rays, Particle Acceleration

Scientific paper

Strongly magnetized white dwarfs (WDs) are able to accelerate particles like rotating neutron-star pulsars. If magnetized WDs are a new Cosmic-ray origin, they should be a quiet but numerous accelerators, giving important contributions of low-energy cosmic-rays. We performed a high sensitive search for possible hard X-ray emission from the fast rotating WD, AE Aquarii with Suzaku. The object has a magnetic field with 105 Gauss and a rapid spin period of 33 sec. From 100 ksec dataset of Suzaku XIS and HXD, we have discovered spiky pulsations like pulsars in the hard X-ray band of over 4 keV, in addition to the well-known thermal modulation in the softer band. In order to account for the hard X-ray signals with the HXD, the X-ray spectrum requires an additional hard X-ray component on the well-known thermal emissions with temperatures of 0.5 and 2.9 keV. Combined with results from timing analyses, spectral shapes and flux, we concluded that the hard X-ray pulsations should be a non-thermal origin, for example, possible Synchrotron emission with sub MeV electrons. Thus, the object must be a first discovery of a WD equivalent of a neutron star pulsar.

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