A Very Luminous Binary Millisecond Pulsar

Navarro, José A.; Bruyn, A. G. de; Frail, D. A.; Kulkarni, S. R.; Lyne, A. G.

doi:10.1086/309816

Cited by 97 publications

(116 citation statements)

References 19 publications

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“…Polarized Galactic foreground emission from the "Fan region" has been detected, matching structures seen in previous observations with WSRT (e.g., Iacobelli et al 2013). In addition to this, the highly polarized pulsar PSR J0218+4232 with a known Faraday depth of −61 rad m −2 (Navarro et al 1995) was detected at the correct Faraday depth after correction for ionospheric Faraday rotation (Sotomayor-Beltran et al 2013). This demonstrates that an accurate polarization survey of the Galactic foreground and extragalactic background sources is feasible with MSSS-HBA.…”

Section: Magnetismmentioning

confidence: 88%

The LOFAR Multifrequency Snapshot Sky Survey (MSSS)

Heald

Pizzo

Orrù

et al. 2015

A&A

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107

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We present the Multifrequency Snapshot Sky Survey (MSSS), the first northern-sky Low Frequency Array (LOFAR) imaging survey. In this introductory paper, we first describe in detail the motivation and design of the survey. Compared to previous radio surveys, MSSS is exceptional due to its intrinsic multifrequency nature providing information about the spectral properties of the detected sources over more than two octaves (from 30 to 160 MHz). The broadband frequency coverage, together with the fast survey speed generated by LOFAR's multibeaming capabilities, make MSSS the first survey of the sort anticipated to be carried out with the forthcoming Square Kilometre Array (SKA). Two of the sixteen frequency bands included in the survey were chosen to exactly overlap the frequency coverage of large-area Very Large Array (VLA) and Giant Metrewave Radio Telescope (GMRT) surveys at 74 MHz and 151 MHz respectively. The survey performance is illustrated within the MSSS Verification Field (MVF), a region of 100 square degrees centered at (α, δ) J2000 = (15 h , 69 • ). The MSSS results from the MVF are compared with previous radio survey catalogs. We assess the flux and astrometric uncertainties in the catalog, as well as the completeness and reliability considering our source finding strategy. We determine the 90% completeness levels within the MVF to be 100 mJy at 135 MHz with 108 resolution, and 550 mJy at 50 MHz with 166 resolution. Images and catalogs for the full survey, expected to contain 150 000-200 000 sources, will be released to a public web server. We outline the plans for the ongoing production of the final survey products, and the ultimate public release of images and source catalogs.

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Section: Magnetismmentioning

confidence: 88%

The LOFAR Multifrequency Snapshot Sky Survey (MSSS)

Heald

Pizzo

Orrù

et al. 2015

A&A

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107

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“…A curious and potentially important distinction is that MSPs tend to show un-broken flux density spectra, continuing with no detected turn-over down to frequencies of 100 MHz (Kramer et al 1999;Kuzmin & Losovsky 2001) and lower (e.g. Navarro et al 1995). Kuzmin & Losovsky (2001) presented spectra of some 30 MSPs using measurements close to 100 MHz.…”

Section: Pulsar Flux Densities and Spectramentioning

confidence: 99%

Observing pulsars and fast transients with LOFAR

Stappers

Hessels

Alexov

et al. 2011

A&A

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160

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Low frequency radio waves, while challenging to observe, are a rich source of information about pulsars. The LOw Frequency ARray (LOFAR) is a new radio interferometer operating in the lowest 4 octaves of the ionospheric "radio window": 10-240 MHz, that will greatly facilitate observing pulsars at low radio frequencies. Through the huge collecting area, long baselines, and flexible digital hardware, it is expected that LOFAR will revolutionize radio astronomy at the lowest frequencies visible from Earth. LOFAR is a next-generation radio telescope and a pathfinder to the Square Kilometre Array (SKA), in that it incorporates advanced multi-beaming techniques between thousands of individual elements. We discuss the motivation for low-frequency pulsar observations in general and the potential of LOFAR in addressing these science goals. We present LOFAR as it is designed to perform high-time-resolution observations of pulsars and other fast transients, and outline the various relevant observing modes and data reduction pipelines that are already or will soon be implemented to facilitate these observations. A number of results obtained from commissioning observations are presented to demonstrate the exciting potential of the telescope. This paper outlines the case for low frequency pulsar observations and is also intended to serve as a reference for upcoming pulsar/fast transient science papers with LOFAR.

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“…Possenti et al 2003;Ransom et al 2005;Freire et al 2005). Another option is to select radiosources with no optical counterpart in catalogs of radiosources, as done by several groups (Crawford et al 2000;Han et al 2004), and with success by Navarro et al (1995). Pulsars can be distinguished from other radiosources in blind surveys by their steep spectral index and by a high degree of polarization, usually above 5%.…”

Section: The Searchesmentioning

confidence: 99%

One blind and three targeted searches for (sub)millisecond pulsars

Davoust

Petit

Fayard

2011

A&A

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Context. Millisecond pulsars are very useful for determining the properties of neutron stars, for testing General Relativity and for detecting gravitational waves. However, the number of known millisecond pulsars is very small compared to that of ordinary pulsars. Aims. We conducted one blind and three targeted searches for millisecond and submillisecond pulsars at radio frequencies. Methods. The blind search was conducted within 3 • of the Galactic plane and at longitudes between 20 • and 110 • . It takes 22 073 pointings to cover this region, and 5487 different positions in the sky (i.e. 25% of the total) were actually observed. The first targeted search was aimed at Galactic globular clusters, the second one at 24 bright polarized and pointlike radiosources with steep spectra, and the third at 65 faint polarized and pointlike radiosources. The observations were conducted at the large radiotelescope of Nançay Observatory, at a frequency near 1400 MHz, the exact value depending on the backend. Two successive backends were used, first a VLBI S2 system, second a digital acquisition board and a PC with large storage capacity sampling the signal at 50 Mb/s on one bit, over a 24-MHz band and in one polarization. The bandwidth of acquisition of the second backend was later increased to 48 MHz and the sampling rate to 100 Mb/s. The survey used the three successive setups, with respective sensitivities of 3.5, 2.2, and 1.7 mJy. The targeted-search data were obtained with the third setup and reduced with a method based on the Hough transform, yielding a sensitivity of 0.9 mJy. The processing of the data was done in slightly differed time by soft-correlation in all cases. Results. No new short-period millisecond pulsars were discovered in the different searches. To better understand the null result of the blind survey, we estimate the probability of detecting one or more short-period pulsars among a given Galactic population of synthetic pulsars with our setup: 25% for the actual incomplete survey and 79% if we had completed the whole survey with a uniform nominal sensitivity of 1.7 mJy. The alternative of surveying a smaller, presumably more densely populated, region with a higher sensitivity would have a low return and would be impractical at a transit instrument. Conclusions. The null result of our blind survey is compatible with our present understanding of the Galactic population of millisecond pulsars. In particular, there does not seem to be a large population of fast-rotating millisecond pulsars.

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A Very Luminous Binary Millisecond Pulsar

Cited by 97 publications

References 19 publications

The LOFAR Multifrequency Snapshot Sky Survey (MSSS)

The LOFAR Multifrequency Snapshot Sky Survey (MSSS)

Observing pulsars and fast transients with LOFAR

One blind and three targeted searches for (sub)millisecond pulsars

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