Single Pulse Investigations at the Decameter Range O.M. Ulyanov 1, V.V. Zakharenko 1, V.S. Nikolaenko 1, A. Deshpande 2, M.V. Popov 3, V.A. Soglasnov 3,

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Presentation transcript:

Single Pulse Investigations at the Decameter Range O.M. Ulyanov 1, V.V. Zakharenko 1, V.S. Nikolaenko 1, A. Deshpande 2, M.V. Popov 3, V.A. Soglasnov 3, A.V. Bilous 3, A.I. Brazhenko 4, R. Vashchishin 4 1-Institute of Radio Astronomy of NASU (Ukraine); 2-Raman Research Institute (India); 3-Astro Spase Center FIAN (Russia) ‏ ; 4-Poltava Gravimetric Observatory RT URAN-2(Ukraine) ‏

RT UTR-2 (Kharkov, Ukraine)‏

RT URAN-2 (Poltava, Ukraine)‏

RT -70 (Evpatoria, Ukraine)‏

Average Spectrum Flux Density of PSR B F, [GHz] Flux, [ mJy ]

Dynamic spectra of PSR B Observation on UTR-2 RT (Ukraine)‏ F, МГц t, c

Anomalous intensive pulses in Decameter Range; PSRs B & B

Fluctuation Spectra of Individual Pulses PSR B at 24 MHz Average ACF with reference transfer function; PSR B

Spectral and Correlation Data analysis of Subpulse Structure PSR B

PSR B Subpulse Width

Cumulative probability distribution of Single Pulses Energy PSR B

Cumulative probability distribution of Single Pulses Energy PSR B

Strong Linear Polarization of AIPs PSR B

Deficite of the scattering time constant at the Decameter Range; PSRB

Single pulses PSR B fc = 24 MHz;  F = MHz;  = 40 us

 D +  t PSR B tt Time resolution for coherent and noncoherent dedispersion in decameter wave range. PSRs B and B , ∆f = 26…29 MHz.  S for different models.  S 1133 (4.0) ~ 20 ms t, s N (2 N points)‏  S 0950 (4.4)‏  S 0950 (4.0)‏  D +  t PSR B

 local = 0.7±0.1 ms PSR B , f C = 28 MHz, B = 1 MHz

Anomalous intensive pulses at Decameter Range; PSRs B & B

Spectral and Correlation Data analysis of Subpulse Structure PSR B

Spectral and Correlation Data analysis of Subpulse Structure PSR B

Dynamic spectra of AIPs of PSR B1133; (CP ?)

PSR B , f C = 25 MHz, B = 1 MHz

Polarization observations of AIPs PSR B at 24 MHz RT URAN-2 (Poltava, Ukraine)‏

Giant Pulse of Crab Pulsar; UTR-2 (Ukraine) f=23 МHz; DM = 57.6 pc/cm 3

Giant Pulses Profiles at Frequencies: 24, 112 & 600 МHz [ASC FIAN (Russia), IRA (Ukraine), RRI (India)] Crab

Conclusion  Subpulses fore pulsars (PSR В ; В ; В ; В ) was found at Decameter Range ( MHz).  The radio emission of the anomalous intense pulses is caused by the strong subpulses that have peak intensity of more than times larger than peak intensity of the corresponding average profiles. The intensity of single pulses has a strong variation in frequency and time. The probability of detection of the anomalous intense pulses does not exceed several percents at Decameter wave range.  Typical band values of detection for the pulses with anomalous intensities lie in the range from 0.2 to 0.5 octaves. The analysis of the results obtained allows one to assume that pulses with anomalous intensity may have relatively narrow generation mechanism in the low frequency range.  Practically energy properties of these pulses do not differ from energy properties the so-called Giant Pulses, which were detected for millisecond pulsars earlier.

 The properties of individual Pulses with Anomalous Intensity (AIPs) at Decameter Range are discussed. In particular were obtained the cumulative probability distributions of energy for AIPs. These laws have long “tails” in the high energy region. The slope of high energy power law fit evolved from -1.5 up to The comparison of the cumulative probability distribution of energy for Giant Pulses (GPs) and PAI were made also.  AIPs are associated with the subpulses or the more small-scale structure, which is located inside these subpulses. PAI have strong degree (up to 90%) of the linear polarization. The common unusual properties are connecting with little values of scattering time constant for AIPs and GPs. Practically the lack of scattering was found for AIPs at the Decameter range. Probably the AIPs are forming in the strong scintillation regime inside of the thick scattering screen. In this case the regime of increasing of the spatial coherence realizes.

The End

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