Wide Field Beamformed Observation with MeerKAT

Chen, W.; Barr, E. D.; Karuppusamy, R.; Krämer, M.; Stappers, B. W.

doi:10.1142/s2251171721500136

Cited by 31 publications

(31 citation statements)

References 22 publications

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“…The other four TRAPUM observations were made with the UHF receivers, at a central frequency f c = 816 MHz, and with ∆ f = 544 MHz, also split into 4096 channels but sampled every 60.24 µs. In all of the TRAPUM observations, the computing power of FBFUSE was used to synthesize either 277 or 288 tied-array beams (Chen et al 2021). These allowed us to cover an area of several square arcminutes around the nominal center of NGC 1851, which extended a few times beyond the half-mass radius of the cluster (see Fig.…”

Section: Observations and Data Analysismentioning

confidence: 99%

“…Using the ratios of the S/N in pairs, it then performs a maximum-likelihood analysis to find the source location that minimizes the differences in the ratios, using the beam positions and accounting for their point spread functions. The latter are calculated with the Mosaic 17 software (Chen et al 2021), using the observation mid-point date and time, as well as the central observing frequency. The custom version of SeeKAT used for this work is also capable of combining information from multiple observations (up to seven, in our case), returning probability contours for the pulsar position that are significantly more accurate than those obtained using a single observation.…”

Section: Localizationmentioning

confidence: 99%

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TRAPUM discovery of 13 new pulsars in NGC 1851 using MeerKAT

Ridolfi

Freire

Gautam

et al. 2022

A&A

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We report the discovery of 13 new pulsars in the globular cluster NGC 1851 by the TRAPUM Large Survey Project using the MeerKAT radio telescope. The discoveries consist of six isolated millisecond pulsars (MSPs) and seven binary pulsars, of which six are MSPs and one is mildly recycled. For all the pulsars, we present the basic kinematic, astrometric, and orbital parameters, where applicable, as well as their polarimetric properties, when these are measurable. Two of the binary MSPs (PSR J0514−4002D and PSR J0514−4002E) are in wide and extremely eccentric (e > 0.7) orbits with a heavy white dwarf and a neutron star as their companion, respectively. With these discoveries, NGC 1851 is now tied with M28 as the cluster with the third largest number of known pulsars (14). Its pulsar population shows remarkable similarities with that of M28, Terzan 5, and other clusters with comparable structural parameters. The newly found pulsars are all located in the innermost regions of NGC 1851 and will likely enable, among other things, detailed studies of the cluster structure and dynamics.

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Section: Observations and Data Analysismentioning

confidence: 99%

Section: Localizationmentioning

confidence: 99%

TRAPUM discovery of 13 new pulsars in NGC 1851 using MeerKAT

Ridolfi

Freire

Gautam

et al. 2022

A&A

Self Cite

View full text Add to dashboard Cite

show abstract

“…The other four TRAPUM observations were made with the UHF receivers, at a central frequency f c = 816 MHz and with ∆ f = 544 MHz, also split into 4096 channels but sampled every 60.24 µs. In all the TRAPUM observations, the computing power of FBFUSE was used to synthesize either 277 or 288 tied-array beams (Chen et al 2021). These allowed us to cover an area of several square arcminutes around the nominal centre of NGC 1851, which extended a few times beyond the half-mass radius of the cluster (see Figure 1).…”

Section: Observations and Data Analysismentioning

confidence: 99%

“…Using the ratios of the S/N in pairs, it then performs a maximum-likelihood analysis to find the source location that minimises the differences in the ratios, using the beam positions and accounting for their point spread functions. The latter are calculated with the Mosaic 17 software (Chen et al 2021), using the observation mid-point date and time, as well as the central observing frequency. The custom version of SeeKAT used for this work is also capable of combining information from multiple observations (up to seven, in our case), returning probability contours for the pulsar position that are significantly more accurate than those obtained using a single observation.…”

Section: Localizationmentioning

confidence: 99%

TRAPUM discovery of thirteen new pulsars in NGC 1851 using MeerKAT

Ridolfi,

Freire,

Gautam

et al. 2022

Preprint

View full text Add to dashboard Cite

We report the discovery of 13 new pulsars in the globular cluster NGC 1851 by the TRAPUM Large Survey Project using the MeerKAT radio telescope. The discoveries consist of six isolated millisecond pulsars (MSPs) and seven binary pulsars, of which six are MSPs and one is mildly recycled. For all the pulsars, we present the basic kinematic, astrometric, and orbital parameters, where applicable, as well as their polarimetric properties, when these are measurable. Two of the binary MSPs (PSR J0514−4002D and PSR J0514−4002E) are in wide and extremely eccentric (e > 0.7) orbits with a heavy white dwarf and a neutron star as their companion, respectively. With these discoveries, NGC 1851 is now tied with M28 as the cluster with the third largest number of known pulsars (14). Its pulsar population shows remarkable similarities with that of M28, Terzan 5 and other clusters with comparable structural parameters. The newly-found pulsars are all located in the innermost regions of NGC 1851 and will likely enable, among other things, detailed studies of the cluster structure and dynamics.

show abstract

“…Aperture Spherical radio Telescope (FAST) and, within a year, surveys will begin with a new cryogenically-cooled phased-array receiver at the Parkes "Murriyang" radio telescope (Dunning et al, in prep.). In addition, wide-field, beam-formed observations are being designed for the TRAnsients and PUlsars with MeerKAT (TRA-PUM) survey (Chen et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Simulating high-time resolution radio-telescope observations

Luo,

Hobbs,

Yong

et al. 2022

Preprint

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We describe a new software package for simulating channelised, high-time resolution data streams from radio telescopes. The software simulates data from the telescope and observing system taking into account the observation strategy, receiver system and digitisation. The signatures of pulsars, fast radio bursts and flare stars are modelled, including frequencydependent effects such as scattering and scintillation. We also simulate more generic signals using spline curves and images. Models of radio frequency interference include signals from satellites, terrestrial transmitters and impulsive, broadband signals. The simulated signals can also be injected into real data sets. Uses of this software include the production of machine learning training data sets, development and testing of new algorithms to search for anomalous patterns and to characterise processing pipelines.

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Wide Field Beamformed Observation with MeerKAT

Cited by 31 publications

References 22 publications

TRAPUM discovery of 13 new pulsars in NGC 1851 using MeerKAT

TRAPUM discovery of 13 new pulsars in NGC 1851 using MeerKAT

TRAPUM discovery of thirteen new pulsars in NGC 1851 using MeerKAT

Simulating high-time resolution radio-telescope observations

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