Fluctuation properties and polar emission mapping of pulsar B0834+06 at decametre wavelengths

Asgekar, A.; Deshpande, A. A.

doi:10.1111/j.1365-2966.2005.08732.x

Cited by 23 publications

(27 citation statements)

References 26 publications

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“…In the carousel model it is expected that all pulsars should have some sort of circulation time. For PSR B0943+10 (Deshpande & Rankin 1999;Deshpande & Rankin 2001;Asgekar & Deshpande 2001) and possibly PSR B0834+06 (Asgekar & Deshpande 2005) a tertiary subpulse modulation feature has been detected from the fluctuation properties and viewing geometry. This periodicity has been interpreted as related to the carousel modulation period (i.e.…”

Section: Introductionmentioning

confidence: 94%

The subpulse modulation properties of pulsars at 21 cm

Weltevrede¹,

Edwards

Stappers

2005

A&A

217

453

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We present the results of a systematic, unbiased search for subpulse modulation of 187 pulsars performed with the Westerbork Synthesis Radio Telescope (WSRT) in the Netherlands at an observing wavelength of 21 cm. Using new observations and archival WSRT data we have increased the list of pulsars that show the drifting subpulse phenomenon by 42, indicating that at least one in three pulsars exhibits this phenomenon. The real fraction of pulsars that show the drifting phenomenon is likely to be larger than 55%. The majority of the analysed pulsars show subpulse modulation (170), of which the majority were not previously known to show subpulse modulation and 30 show clear systematic drifting. The large number of new drifters we have found allows us, for the first time, to do meaningful statistics on the drifting phenomenon. We find that the drifting phenomenon is correlated with the pulsar age such that drifting is more likely to occur in older pulsars. Pulsars that drift more coherently seem to be older and have a lower modulation index. There is no significant correlation found between P 3 and other pulsar parameters (such as the pulsar age), as has been reported in the past. There is no significant preference of drift direction and the drift direction is not found to be correlated with pulsar parameters. None of the four complexity parameters predicted by different emission models are shown to be inconsistent with the set of modulation indices of our sample of pulsars. Therefore none of the models can be ruled out based on our observations. We also present results on some interesting new individual sources like a pulsar that shows similar subpulse modulation in both the main-and interpulse and six pulsars with opposite drift senses in different components.

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Section: Introductionmentioning

confidence: 94%

The subpulse modulation properties of pulsars at 21 cm

Weltevrede¹,

Edwards

Stappers

2005

A&A

217

453

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show abstract

“…In some bright pulsars, the sub-pulse drifting has been shown to be in phase from 300 to 1400 MHz (Joshi 2013). Several pulsars have been studied in detail, with some studies providing strong support to the above carousel model (Vivekanand & Joshi 1999;Deshpande & Rankin 1999;Deshpande & Rankin 2001;Asgekar & Deshpande 2005) while the others indicating towards inconsistencies in the model (Edwards, Stappers, & van Leeuwen 2003;Maan & Deshpande 2014). Some other models also have been proposed (Clemens & Rosen 2004;Clemens & Rosen 2008;Jones 2013;Jones 2014) to explain the sub-pulse modulation in pulsars.…”

Section: Radio Pulsarsmentioning

confidence: 99%

Neutron Star Physics in the Square Kilometre Array Era: An Indian Perspective

Konar¹,

Bagchi²,

Bandyopadhyay³

et al. 2016

J Astrophys Astron

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It is an exceptionally opportune time for Astrophysics when a number of next-generation mega-instruments are poised to observe the universe across the entire electromagnetic spectrum with unprecedented data quality. The Square Kilometre Array (SKA) is undoubtedly one of the major components of this scenario. In particular, the SKA is expected to discover tens of thousands of new neutron stars giving a major fillip to a wide range of scientific investigations. India has a sizeable community of scientists working on different aspects of neutron star physics with immediate access to both the uGMRT (an SKA pathfinder) and the recently launched X-ray observatory Astrosat. The current interests of the community largely centre around studies of -a) the generation of neutron stars and the SNe connection, b) the neutron star population and evolutionary pathways, c) the evolution of neutron stars in binaries and the magnetic fields, d) the neutron star equation of state, e) the radio pulsar emission mechanism, and, f) the radio pulsars as probes of gravitational physics. Most of these studies are the main goals of the SKA first phase, which is likely to be operational in the next four years. This article summarises the science goals of the Indian neutron star community in the SKA era, with significant focus on coordinated efforts among the SKA and other existing/upcoming instruments.

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“…In recent years some excellent studies have continued at frequencies between 20−110 MHz mainly using the Pushchino, Gauribidanur and UTR-2 telescopes (e.g. Malov & Malofeev 2010;Asgekar & Deshpande 2005;Popov et al 2006b;Ulyanov et al 2006). These studies have begun to map, e.g., the low-frequency spectra, pulse morphologies, and pulse energy distributions of pulsars, but have in some cases been limited by the available bandwidths and/or polarisation and tracking capabilities of these telescopes (see Sect.…”

Section: Introductionmentioning

confidence: 99%

Observing pulsars and fast transients with LOFAR

Stappers

Hessels

Alexov

et al. 2011

A&A

Self Cite

213

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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Fluctuation properties and polar emission mapping of pulsar B0834+06 at decametre wavelengths

Cited by 23 publications

References 26 publications

The subpulse modulation properties of pulsars at 21 cm

The subpulse modulation properties of pulsars at 21 cm

Neutron Star Physics in the Square Kilometre Array Era: An Indian Perspective

Observing pulsars and fast transients with LOFAR

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