A. Golden et al. 2000 ApJ 535 373 doi:10.1086/308826
Unpulsed Optical Emission from the Crab Pulsar*
FREEA. Golden1, A. Shearer1 and G. M. Beskin2
Show affiliationsBased on observations of the Crab pulsar using the TRIFFID high-speed imaging photometer in the UBV bands using the Special Astrophysical Observatory's 6 m telescope in the Russian Caucasus, we report the detection of pronounced emission during the so-called off phase of emission. Following de-extinction, this unpulsed component of emission is shown to be consistent with a power law with an exponent of α = -0.60 ± 0.37, the uncertainty being dominated by the error associated with the independent CCD photometry used to reference the TRIFFID data. This suggests a steeper power-law form than that reported elsewhere in the literature for the total integrated spectrum, which is essentially flat with α ~ 0.1, although the difference in this case is only significant at the ≤2 σ level. Deeper reference integrated and TRIFFID phase-resolved photometry, in these bands in conjunction with further observations in the UV and R region, would constrain this fit further.
- Footnote
- Subject headings
pulsars: individual (PSR 0531+21); instrumentation: detectors
- Dates
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Issue 1 (2000 May 20)
Received 1999 August 5, accepted for publication 1999 December 21
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Unpulsed Optical Emission from the Crab Pulsar
A. Golden et al. 2000 ApJ 535 373
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