Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...116..158n&link_type=abstract
Astronomy and Astrophysics, vol. 116, no. 1, Dec. 1982, p. 158-163.
Astronomy and Astrophysics
Astronomy
14
Pulsars, Radio Frequencies, Spectrum Analysis, Stellar Spectra, Variable Stars, Data Reduction, Fourier Transformation, Radio Astronomy
Scientific paper
The frequency dependence of the fluctuation spectra of single pulse sequences from nine pulsars measured at frequencies in the range from 430 MHz to 2.7 GHz is analyzed. The average drifting-subpulse and steady-emission profiles at two observing frequencies (430 MHz and 1.7 GHz or 1.4 and 1.7 GHz) are compared for four of the pulsars. The analysis shows that the quasi-steady component increases gradually with increasing frequency in all nine pulsars and that the P3 periods are independent of frequency in both systematic and erratic drifters. It is suggested that a slow intensity modulation produced by the quasi-steady component may account for the break in the modulation index-frequency relation for some pulsars and that the phenomena observed may be directly related to the pulse constituents known as the core and the conal emissions.
Kepa Anna
Nowakowski L.
Usowicz Jerzy
Wolszczan Alex
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