Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...581..485f&link_type=abstract
The Astrophysical Journal, Volume 581, Issue 1, pp. 485-494.
Astronomy and Astrophysics
Astronomy
8
Stars: Pulsars: Individual: Alphanumeric: Psr B0531+21, Radiation Mechanisms: Nonthermal, Stars: Neutron
Scientific paper
High time resolution spectroscopic imaging of the Crab pulsar across the optical wave band has been undertaken utilizing the 4 m Mayall telescope at Kitt Peak National Observatory. The 33.51 ms period of the pulsar was split into 723.7 time slices of 46.3 μs and a spectrum within each slice acquired. These data have allowed analysis of both the light curve as a function of wavelength and the spectrum as a function of phase position. Wavelength-dependent changes in phase position for both emission peaks have been found, and these appear to be uncorrelated. Related to these changes are phase position-dependent variations in the spectral index, and these have been measured, the shapes being in agreement with previously published data. Also related are energy-dependent changes in the FWHMs. In addition, we find, in support of previously published data, that the fluence of Peak 2 relative to Peak 1 decreases with increasing wavelength. These results then challenge the validity of currently existing models for pulsar emission.
Carraminana Alberto
Fordham John L. A.
Michel Rigo
Much Rudi
Vranesevic N.
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