Shearer, A and Golden, Aaron and Harfst, S and Butler, R. and Redfern, R. M. and O'Sullivan, Créidhe and Beskin, G. M. and Neizvestny, S. I. and Neustroev, V. V. and Plokhotnichenko, V.L. and Cullum, M and Danks, A. (2008) Possible pulsed optical emission from Geminga. Astronomy and Astrophysics, 335 (1). pp. 1-6. ISSN 0004-6361

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Abstract

We present optical data which suggests that G", the optical counterpart of the gamma -ray pulsar Geminga, possibly 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 1 sigma upper limit of m_B ~ 27 for the unpulsed fraction.

Item Type:	Article
Keywords:	pulsars; individual; Geminga; techniques; 2-d photon-counting detectors;
Academic Unit:	Faculty of Science and Engineering > Experimental Physics
Item ID:	18854
Depositing User:	Dr. Créidhe O'Sullivan
Date Deposited:	10 Sep 2024 15:02
Journal or Publication Title:	Astronomy and Astrophysics
Publisher:	EDP Sciences
Refereed:	Yes
URI:	Publisher
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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