Abstract
Based 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 inde-pendent 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.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 373-378 |
| Number of pages | 6 |
| Journal | Astrophysical Journal |
| Volume | 535 |
| Issue number | 1 PART 1 |
| State | Published - May 20 2000 |
| Externally published | Yes |
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Keywords
- Instrumentation: detectors
ASJC Scopus subject areas
- Space and Planetary Science
Cite this
Unpulsed optical emission from the Crab pulsar. / Golden, A.; Shearer, A.; Beskin, G. M.
In: Astrophysical Journal, Vol. 535, No. 1 PART 1, 20.05.2000, p. 373-378.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Unpulsed optical emission from the Crab pulsar
AU - Golden, A.
AU - Shearer, A.
AU - Beskin, G. M.
PY - 2000/5/20
Y1 - 2000/5/20
N2 - Based 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 inde-pendent 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.
AB - Based 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 inde-pendent 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.
KW - Instrumentation: detectors
UR - http://www.scopus.com/inward/record.url?scp=0034690402&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0034690402&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0034690402
VL - 535
SP - 373
EP - 378
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 1 PART 1
ER -