Статистика обнаружений импульсных сигналов в площадке со склонениями от +42° до +52° на частоте 111 МГц

Астрономический журнал. 2022. Т. 99. № 4. С. 334–341.

Samodurov V., Тюльбашев С. А., Торопов М. О., Logvinenko S. V.

A search for impulse signals was carried out in a new site included in the monitoring program for the search for pulsars and transients. Processing of several months of data recorded in six frequency channels with a total bandwidth of 2.5 MHz showed that, on average, 4 pulses per hour are observed in each of the 24 connected stationary beams. Of these pulses, 18.3% are similar to those of pulsars. They are visible in one or two neighboring beams and have a pronounced dispersion shift; are recorded first at a high and then at a low frequency, which indicates the possible passage of the signal through the interstellar medium. Almost 68% of such detected pulses belong to six known pulsars with dispersion measures from 9 to 141 pc/cm3, and almost all of the remaining pulses are either noise of an unknown nature or artifacts of the proposed pulse separation technique. An additional study of the selected array of 3650 explicit pulsar pulses revealed 13 pulses belonging to four rotating radio transients (RRAT). Their dispersion measures are in the range 17 – 51 pc/cm3. A search for regular (periodic) RRAT emission was carried out using power spectra summed over 121 days. Periodic radiation was not detected, but for two RRATs, upper estimates of the periods were obtained from measurements of the time intervals between pulses. The upper estimates of the integrated flux density of the detected RRATs are in the range of 2–4 mJy at a frequency of 111 MHz.

Keywords: пульсары, pulsars, rotating radio transients (RRAT), вращающиеся радиотранзиенты (RRAT),