Pulsed optical emission from Geminga

Details Pulsed optical emission from Geminga Pulsed optical emission from Geminga

1998-02-17

arxiv.org/abs/astro-ph/9802225v1

Astronomy and Astrophysics

Astrophysics

5 pages, 3 figures, Latex, submitted to A&A

Scientific paper

We present optical data which shows that G", the optical counterpart of the gamma-ray pulsar Geminga, pulses in B with a period of 0.237 seconds. The similarity between the optical pulse shape and the gamma-ray light curve indicates that a large fraction of the optical emission is non-thermal in origin - contrary to recent suggestions based upon the total optical flux. The derived magnitude of the pulsed emission is m_B = 26.0 +/- 0.4. Whilst it is not possible to give an accurate figure for the pulsed fraction (due to variations in the sky background) we can give an upper limit of m_B ~ 27 for the unpulsed fraction.

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