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Shearer, A, Golden, Aaron, Harfst, S, Butler, R., Redfern, R. M., O'Sullivan, Créidhe, Beskin, G. M., Neizvestny, S. I., Neustroev, V. V., Plokhotnichenko, V.L., 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 |
| Related URLs: | |
| URI: | https://mural.maynoothuniversity.ie/id/eprint/18854 |
| 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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