Phase-resolved spectroscopy of Geminga shows rotating hot spot(s)

Details Phase-resolved spectroscopy of Geminga shows rotating hot spot(s) Phase-resolved spectroscopy of Geminga shows rotating hot spot(s)

2004-07-19

arxiv.org/abs/astro-ph/0407402v1

Astronomy and Astrophysics

Astrophysics

Published in Science, 16 July 2004

Scientific paper

10.1126/science.1097173

Isolated neutron stars are seen in x-rays through their nonthermal and/or surface thermal emissions. XMM-Newton observations of the Geminga pulsar show a 43 electron volt spectrum from the whole neutron star surface, as well as a power-law component above 2 kiloelectron volts. In addition, we have detected a hot (170 electron volts) thermal emission from an 60-meter-radius spot on the pulsar s surface. Such a thermal emission, only visible at selected phase intervals, may be coming from polar hot spot(s), long thought to exist as a result of heating from magnetospheric accelerated particles. It may provide the missing link between the x-ray and gamma-ray emission of the pulsar.

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