Search

A survey of the northern hemisphere at the frequency 111 MHz is carried out. The total accumulation time for each point of the survey area was at least one hour. When searching for dispersed pulses, we detected 75 sources of pulsed radiation. More than 80% of these sources are known pulsars seen in the antenna side lobes. In twelve known pulsars, from one to several hundred pulses were detected. In four pulsars (J0157+6212, J1910+5655, J2337+6151, and J2354+6155), the narrowness of the strongest pulses and the ratio of peak flux densities in the strongest pulses and in the middle profile indicate that they may be pulsars with giant pulses. We detected one new rotating radio transient (RRAT) J0812+8626 with the dispersion measure pc/cm3. [ABSTRACT FROM AUTHOR]

We present an analysis of the individual pulses of four rotating radio transients (RRATs), previously discovered in a monitoring survey running for 5.5 yr at the frequency of 111 MHz. At a time interval equivalent to 5 d of continuous observations for each RRAT, 90, 389, 206 and 157 pulses were detected in J0640+07, J1005+30, J1132+25 and J1336+33, respectively. The investigated RRATs have different distributions of their pulse amplitudes. For J0640+07 and J1132+25, the distribution is described by a single exponent over the entire range of flux densities. For J1005+30 and J1336+33, it is a lognormal function with a power-law tail. For J0640+07 and J1005+30, we have detected pulses with a signal-to-noise ratio (S/N) of a few hundred. For J1132+25 and J1336+33, the S/N of the strongest pulses reaches several tens. These RRATs show a strong change in their emission. When the strengths of their pulse amplitudes are significantly changed, we see long intervals of absence of emission or its strong attenuation. The analysis carried out in this work shows that it is possible that all the studied RRATs are, apparently, pulsars with giant pulses. [ABSTRACT FROM AUTHOR]

The search for pulsar (periodic) radiation of five gamma-ray pulsars was carried out using the summed power spectra and summed periodograms. No harmonics corresponding to the known periods of the pulsars were found. An upper estimate was obtained for the integral flux density of pulsars J0357+3205 (<0.5 mJy), J0554+3107 (<0.5 mJy), J1958+2846 (<0.5 mJy), J2021+4026 (<0.4 mJy), and J2055+2539 (<0.55 mJy). [ABSTRACT FROM AUTHOR]

The search for compact components of strong ( Jy at 102.5 MHz) discrete radio sources from the Pushchino catalogue was carried out using the method of interplanetary scintillation. A total of 3620 sources were examined, and 812 of them were found to harbor compact (scintillating) components. Estimates of fluctuations of the flux density of these compact components were derived from the scintillation index () corresponding to an elongation of 25°. The angular size and compactness of 178 sources with compact components were estimated. Scintillation indices of sources corresponding to the compact component () and flux densities of compact components were determined. It was demonstrated that slow variations of the spatial distribution of interplanetary plasma, which are related to the 11-year cycle of solar activity, may exert a systematic influence on the estimates of angular sizes of sources. Coefficients compensating the deviation from the spherical symmetry of solar wind in the estimates of angular sizes were found using the coefficient of asymmetry of the statistical distribution of intensity fluctuations. The study of correlations between the parameters of sources in the sample revealed that the maximum value of the scintillation index decreases as the integrated flux increases, while the angular size has no marked dependence on the integrated flux. [ABSTRACT FROM AUTHOR]