PULSAR B1237+25 AT 111 MHz: AVERAGE PROFILE, MODE SWITCHING, NULLINGS, MICROSTRUCTURE

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Аннотация

An analysis of observations of the pulsar B1237+25 at a frequency of 111 MHz is presented. The observations were carried out with the Large In-Phase Antenna (LPA) of the Pushchino Radio Astronomical Observatory of P.N. Lebedev Physical Institute. A new component was detected in the average profile in the central region of the emission. This component with a half-width of 1.6 ms is observed against the background of a more extended component with a half-width of 7 ms. This new component of the average profile at a frequency of 111 MHz manifests itself in all modes of the pulsar radio emission: quiet-normal (QN), flare-normal (FN) and in the abnormal mode (AB), and in the abnormal mode it was also detected by other observers at other frequencies. The drift of subpulses is observed in the normal mode of emission only in the extreme (first and last) components. The normal mode is interrupted by nullings and transitions to the abnormal mode AB. In the AB mode, the structure of the activity zones at the edge of the outer cone is destroyed, the distance between the inner and outer cones increases almost twice, and the distance between the inner cone and the central region decreases. Analysis of our data showed that the components of the outer and inner cones of the average profile are formed by the ordinary mode of radio emission (O-mode) and constitute a single cone emission of the pulsar. The central components of the average profile (wide and narrow) are formed by the extraordinary mode of emission (X-mode). Estimates of the height of the emission from the central region (X-mode) and the cone emission (O-mode) are obtained: 80 km and 370 km, respectively. A microstructure with a submicrosecond time scale of τµ ≤ 0.5μs was discovered. Such a time scale corresponds well to the characteristic time of spark discharge development in the polar cap. For this value of τµ, the vacuum gap height should be hp ≤ 750 cm. Based on the steepness of the trailing edge of an individual pulse at the longitude of the first component, a limit was obtained on the value of the γ factor of the relativistic secondary plasma: γ ≥ 260. The analysis showed that in 88% of cases, the normal mode (N) is realized, and in 81% of them — the QN mode and only in 19% the FN mode. The AB mode is only 12%. The dependence of the distance between the components of the outer and inner cones of radiation on the frequency is the same and corresponds to a power law with an index of −0.16.

Авторлар туралы

M. Popov

Astrospace Center of P. N. Lebedev Physical Institute of the Russian Academy of Sciences

Email: popov069@asc.rssi.ru
Moscow, Russia

T. Smirnova

Pushchino Radio Astronomy Observatory of P. N. Lebedev Physical Institute of the Russian Academy of Sciences

Email: tania@prao.ru
Pushchino, Russia

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