Quasiperiodic microstructure in radio pulsar emissions

Journal Article · Sat Dec 01 04:00:00 EST 1990 · Astronomical Journal; (USA)

DOI:https://doi.org/10.1086/115644· OSTI ID:6261611

Cordes, J M; Weisberg, J M; Hankins, T H ^[1]

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1. Cornell Univ., Ithaca, NY (USA) Carleton College, Northfield, MN (USA) New Mexico Institute for Mining and Technology, Socorro (USA)

A detailed analysis of microstructure in the radio emissions from five pulsars is presented, with particular emphasis on quasi-periodicities of the microstructure. Two objects (PSRs 0950 + 08 and 1133 + 16) show microstructure in only about 5-10 percent of pulse periods whereas the three objects that display drifting subpulses (PSRs 0809 + 74, 1944 + 17, and 2016 + 28) almost always show microstructure. The microstructure for two objects (1944 + 17 and 2016 + 28) is strongest at meter wavelengths and its contribution to the intensity decreases roughly as nu to the -3. The quasi-periods of periodic microstructure vary over a 10:1 range about an average period of 0.5-5 ms. The period can change on timescales as short as the typical subpulse separation, P2 about or equal to 10-60 ms. The significance of microstructure quasi-periodicities is discussed in terms of neutron star oscillation and activity in the pulsar magnetosphere. 54 refs.

• OSTI ID: 6261611
• Journal Information: Astronomical Journal; (USA), Journal Name: Astronomical Journal; (USA) Vol. 100; ISSN 0004-6256; ISSN ANJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ATMOSPHERES
COSMIC RADIO SOURCES
ELECTROMAGNETIC RADIATION
EMISSION
MORPHOLOGY
NEUTRON STARS
OSCILLATIONS
PULSARS
PULSES
RADIATIONS
RADIOWAVE RADIATION
STARS
STELLAR ATMOSPHERES
STELLAR MAGNETOSPHERES