Characteristics of the pulsed emission of the peculiar pulsar B1822-09 at low radio frequencies |
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Authors: | S A Suleymanova S V Logvinenko T V Smirnova |
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Institution: | 1.Pushchino Radio Astronomy Observatory, Astro Space Center, Lebedev Institute of Physics,Russian Academy of Sciences,Pushchino, Moscow oblast,Russia |
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Abstract: | The pulse structure of the pulsar B1822-09 has been studied at 112, 62, and 42 MHz. The observations were conducted in 2010
on the Large Scanning Antenna and the DKR-1000 radio telescope of the Pushchino Radio Astronomy Observatory. The shape of
the main pulse and interpulse undergo considerable changes at low radio frequencies. In the main pulse, the precursor disappears
and is replaced by a new component that trails 50 ms behind the main component. At 62 MHz, the interpulse acquires a pronounced
two-peaked shape. At 62 and 112 MHz, as well as at higher frequencies, the brighter second component of the interpulse follows
the main pulse at 185° and has a relative amplitude of about 5%. The main pulse width changes with frequency according to
the power law W
0.5 ∼ ν
−0.15 in the frequency range 42–4750-MHz. The interpulse width follows this law only in the range 325–4750 MHz; at 112, 102, and
62 MHz, the interpulse is almost a factor of three broader than themain pulse. The parameters of the pulse’s scattering on
interstellar plasma inhomogeneities and the initial pulse width before it enters the scattering medium have been measured
at 62 and 42 MHz. The frequency dependence of the characteristic scale for scattering of the pulses of B1822-09 corresponds
to a Kolmogorov spectrum for the electron-density fluctuations in the interstellar medium in the direction toward this pulsar. |
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