Search for pulsars with periods of more than two seconds at declinations from +21◦ to +42◦

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Аннотация

The search for long period transients with periods (P) from 2 to 90 s was carried out in daily observations conducted in a area 6300 sq. deg.. The data was obtained on a Large Phased Array (LPA) at a frequency of 111 MHz. Periodograms calculated using the Fast Folding Algorithm (FFA) were used for the search. To increase the sensitivity, the periodograms obtained in different observation sessions were added. Of the 14 known pulsars that entered the study area, having periods P > 2 c and dispersion measures (DM) less than 200 pc/cm3, 9 were detected. Two new pulsars were found. The average profiles of pulsars are obtained and estimates of their flux density are given. The discovered pulsar J1951+28, with a period of P = 7.3342 s and DM = 3.5 pc/cm3, turned out to be one of the closest pulsars to the Sun. The absence of new long period transients (pulsars or white dwarf) with periods of tens of seconds with the achieved sensitivity of searching for 1 mJy outside the galactic plane indicates a low probability of the existence of pulsars of neutron stars with extremely long periods. Most likely, the recently found sources of periodic radiation with periods from a minute to tens of minutes are white dwarfs pulsars.

Негізгі сөздер

Авторлар туралы

S. Tyul’bashev

Lebedev Physical Institute

Хат алмасуға жауапты Автор.
Email: serg@prao.ru

Astro-Space center, Pushchino radio astronomy observatory

Ресей, Pushchino

G. Tyul’basheva

Institute of Mathematical Problems of Biology RAS (IMPB RAS), branch of Keldysh Institute of Applied Mathematics of Russian Academy of Sciences

Email: serg@prao.ru
Ресей, Pushchino

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