Correlation analyses of microstructure and noiselike intensity fluctuations from pulsar 2016 + 28

Journal Article · Wed Sep 15 04:00:00 EDT 1976 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/154683· OSTI ID:7133017

Cordes, J M

Correlation analyses of pulses obtained at 430 MHz with 12 ..mu..s resolution show that the pulsar signal is accurately described as amplitude-modulated Gaussian noise. In the average autocorrelation function of many pulses, microstructure decorrelates at a 0.29 ms lag and is quasiperiodic with a 0.9 ms period. The microstructure in individual subpulses is usually quasi-periodic with a period that is usually in the range 0.6 to 1.1 ms. Microstructure that occasionally has periods between 0.3 and 0.5 ms tends to be weaker and is of shorter duration than the longer period microstructure. The hypothesis of D.C. Backer that there is a pulse to pulse correlation of the microstructure along a band of drifting subpulses was tested by computing cross-correlation functions of successive subpulses. Although average cross-correlations show no evidence of any such correlation, it does appear that the period of the quasi-periodic microstructure exhibits some pulse to pulse correlation in a few bands of subpulses. In general, the period changes markedly from pulse to pulse and between the subpulses in the same pulse. It is therefore implausible that stellar vibration, which has a 1 ms period and a 1 s damping time for a neutron star, is the cause of microstructure periodicities.

• Research Organization: Univ. of California, San Diego
• OSTI ID: 7133017
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 208:3; ISSN ASJOA
• Country of Publication: United States
• Language: English

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71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COSMIC RADIO SOURCES
ELECTROMAGNETIC RADIATION
FINE STRUCTURE
NEUTRON STARS
OSCILLATION MODES
PULSARS
PULSES
RADIATIONS
RADIOWAVE RADIATION
STARS
VARIATIONS