Search for and detection of pulsars inmonitoring observations at 111 MHz

Tyul’bashev, S. A.; Tyul’bashev, V. S.; Китаева, М. А.; Chernyshova, A. I.; Malofeev, V. M.; Чашей, И. В.; Shishov, V. I.; Дагкесаманский, Р. Д.; Klimenko, Stanislav; Nikitin, Igor; Nikitina, Lialia

doi:10.1134/s1063772917100109

Cited by 32 publications

(21 citation statements)

References 19 publications

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“…Additional details of the capabilities of the updated LPA LPI and of the search technique are given in Shishov et al (2016);Tyul'bashev et al (2017Tyul'bashev et al ( , 2018 and in BSA-Analytics Project (https://bsa-analytics.prao.ru/). Figure 1 demonstrates the sample pulses from the pulsar and the new RRAT.…”

Section: Observations and Resultsmentioning

confidence: 99%

“…It may differ from the given value by a factor of 1.5−2. For the RRATs with an estimated value for the period, we checked the presence of the signal in the cumulative Fourier power spectra obtained for six-channel frequency data with a sampling interval of 0.1 s (Tyul'bashev et al 2017). We have found no harmonics for the periods listed in the table.…”

Section: Observations and Resultsmentioning

confidence: 99%

“…The data from the survey were also used for the search of pulsars and transients. Two independent groups have discovered 41 pulsars (Tyul'bashev et al 2016;Rodin et al 2017;Tyul'bashev et al 2017).…”

Section: Introductionmentioning

confidence: 99%

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Detection of 25 new rotating radio transients at 111 MHz

Tyul’bashev

Malofeev

2018

A&A

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Nearly all fast radio RRAT-type transients that are pulsars with rare pulses have been previously detected using decimetre wavelengths. We present here 34 transients detected at metre wavelengths in our daily monitoring at declinations −9 • ≤ δ ≤ +42 • . 25 transients are new RRATs. We confirmed the detection of 7 RRATs based on our early observations. One of the 34 detected transients was determined to be a new pulsar J1326+3346. At the same time, out of 35 RRATs detected at the decimetre wavelengths and included in the studied area, only one was detected by us J1848+1518. The periods of 6 RRATs were found from the time of arrival of single pulses. Three quarters of all RRATs were observed more than once and the total number of RRATs in the area studied has doubled.

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Section: Observations and Resultsmentioning

confidence: 99%

Section: Observations and Resultsmentioning

confidence: 99%

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Detection of 25 new rotating radio transients at 111 MHz

Tyul’bashev

Malofeev

2018

A&A

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“…During the preparation of this manuscript, some of the LOTAAS pulsars were presented as independent discoveries by Tyul'bashev et al (2016Tyul'bashev et al ( , 2017 Table 2 indicates these pulsars with P.…”

Section: Discoveriesmentioning

confidence: 99%

The LOFAR Tied-Array All-Sky Survey (LOTAAS): Survey overview and initial pulsar discoveries

Sanidas

Cooper

Bassa

et al. 2019

A&A

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We present an overview of the LOFAR Tied-Array All-Sky Survey (LOTAAS) for radio pulsars and fast transients. The survey uses the high-band antennas of the LOFAR Superterp, the dense inner part of the LOFAR core, to survey the northern sky (δ > 0 • ) at a central observing frequency of 135 MHz. A total of 219 tied-array beams (coherent summation of station signals, covering 12 square degrees), as well as three incoherent beams (covering 67 square degrees) are formed in each survey pointing. For each of the 222 beams, total intensity is recorded at 491.52 µs time resolution. Each observation integrates for 1 hr and covers 2592 channels from 119 to 151 MHz. This instrumental setup allows LOTAAS to reach a detection threshold of 1 to 5 mJy for periodic emission. Thus far, the LOTAAS survey has resulted in the discovery of 73 radio pulsars. Among these are two mildly recycled binary millisecond pulsars (P = 13 and 33 ms), as well as the slowest-spinning radio pulsar currently known (P = 23.5 s). The survey has thus far detected 311 known pulsars, with spin periods ranging from 4 ms to 5.0 s and dispersion measures from 3.0 to 217 pc cm −3 . Known pulsars are detected at flux densities consistent with literature values. We find that the LOTAAS pulsar discoveries have, on average, longer spin periods than the known pulsar population. This may reflect different selection biases between LOTAAS and previous surveys, though it is also possible that slower-spinning pulsars preferentially have steeper radio spectra. LOTAAS is the deepest all-sky pulsar survey using a digital aperture array; we discuss some of the lessons learned that can inform the approach for similar surveys using future radio telescopes such as the Square Kilometre Array.

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“…The sample of pulsars includes PSR J1658+3630, the first binary pulsar discovered by the survey. PSRs J0421+3255, J1638+4005, J1643+1338 and J1657+3304 were first reported by Tyul'bashev et al (2016Tyul'bashev et al ( , 2017Tyul'bashev et al ( , 2018 and these pulsars were blindly detected by LOTAAS around the same time. As of September, 2019 there are no published timing models for these pulsars.…”

mentioning

confidence: 86%

The LOFAR Tied-Array all-sky survey: Timing of 21 pulsars including the first binary pulsar discovered with LOFAR

Tan

Bassa

Cooper

et al. 2020

Monthly Notices of the Royal Astronomical Society

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We report on the multi-frequency timing observations of 21 pulsars discovered in the LOFAR Tied-Array All-Sky Survey (LOTAAS). The timing data were taken at central frequencies of 149 MHz (LOFAR) as well as 334 and 1532 MHz (Lovell Telecope). The sample of pulsars includes 20 isolated pulsars and the first binary pulsar discovered by the survey, PSR J1658+3630. We modelled the timing properties of the pulsars, which showed that they have, on average, larger characteristic ages. We present the pulse profiles of the pulsars across the three observing bands, where PSR J1643+1338 showed profile evolution that appears not to be well-described by the radius-to-frequencymapping model. Furthermore, we modelled the spectra of the pulsars across the same observing bands, using a simple power law, and found an average spectral index of −1.9 ± 0.5. Amongst the pulsars studied here, PSR J1657+3304 showed large flux density variations of a factor of 10 over 300 days, as well as mode changing and nulling on timescales of a few minutes. We modelled the rotational and orbital properties of PSR J1658+3630, which has a spin period of 33 ms in a binary orbit of 3.0 days with a companion of minimum mass of 0.87M , likely a Carbon-Oxygen or Oxygen-Neon-Magnesium type white dwarf. PSR J1658+3630 has a dispersion measure of 3.0 pc cm −3 , making it possibly one of the closest binary pulsars known.

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Search for and detection of pulsars inmonitoring observations at 111 MHz

Cited by 32 publications

References 19 publications

Detection of 25 new rotating radio transients at 111 MHz

Detection of 25 new rotating radio transients at 111 MHz

The LOFAR Tied-Array All-Sky Survey (LOTAAS): Survey overview and initial pulsar discoveries

The LOFAR Tied-Array all-sky survey: Timing of 21 pulsars including the first binary pulsar discovered with LOFAR

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