Simultaneous radio and X-ray observations of PSR B0611+22

Rajwade, Kaustubh; Seymour, A.; Lorimer, D. R.; Karastergiou, A.; Serylak, M.; McLaughlin, M. A.; Grießmeier, J.-M.

doi:10.1093/mnras/stw1858

Cited by 20 publications

(20 citation statements)

References 54 publications

(73 reference statements)

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“…While a single LOFAR station such as FR606 only has a limited effective area, it allows us to take advantage of very flexible scheduling, especially for long observations or high cadence monitoring. The capability of this setup for pulsar science has already been demonstrated (Rajwade et al 2016;Mereghetti et al 2016Mereghetti et al , 2018Grießmeier et al 2018;Bondonneau et al 2018;Tiburzi et al 2019;Michilli et al 2018a,b;Hermsen et al 2018;Donner et al 2019).…”

Section: Observationsmentioning

confidence: 93%

A census of the pulsar population observed with the international LOFAR station FR606 at low frequencies (25–80 MHz)

Bondonneau

Grießmeier

Theureau

et al. 2020

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Context. To date, only 69 pulsars have been identified with a detected pulsed radio emission below 100 MHz. A LOFARcore LBA census and a dedicated campaign with the Nançay LOFAR station in stand-alone mode were carried out in the years 2014−2017 in order to extend the known population in this frequency range. Aims. In this paper, we aim to extend the sample of known radio pulsars at low frequencies and to produce a catalogue in the frequency range of 25-80 MHz. This will allow future studies to probe the local Galactic pulsar population, in addition to helping explain their emission mechanism, better characterising the low-frequency turnover in their spectra, and obtaining new information about the interstellar medium through the study of dispersion, scattering, and scintillation. Methods. We observed 102 pulsars that are known to emit radio pulses below 200 MHz and with declination above −30 • . We used the the Low Band Antennas (LBA) of the LOw Frequency ARray (LOFAR) international station FR606 at the Nançay Radio Observatory in stand-alone mode, recording data between 25-80 MHz. Results. Out of our sample of 102 pulsars, we detected 64. We confirmed the existence of ten pulsars detected below 100 MHz by the LOFAR LBA census for the first time (Bilous et al. 2019) and we added two more pulsars that had never before been detected in this frequency range. We provided average pulse profiles, DM values, and mean flux densities (or upper limits in the case of non-detections). The comparison with previously published results allows us to identify a hitherto unknown spectral turnover for five pulsars, confirming the expectation that spectral turnovers are a widespread phenomenon.

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Section: Observationsmentioning

confidence: 93%

A census of the pulsar population observed with the international LOFAR station FR606 at low frequencies (25–80 MHz)

Bondonneau

Grießmeier

Theureau

et al. 2020

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“…Recently, several new quasiperiodic bursting phenomena, akin to mode changes, have been identified in radio pulsar emission-e.g., PSR J1752+2359 (Lewandowski et al 2004); J1938+2213 (Lorimer et al 2013); B0611+22 (Seymour et al 2014). For PSR B0611+22 Rajwade et al (2016) explored whether there might be simultaneous X-ray emission changes during its radio mode changes. However, they did not detect X-ray emission from this pulsar, and hence the mode changes could not be associated with magnetospheric "states" as have been observed for the radio and X-ray mode changing pulsar B0943+10 (Hermsen et al 2013;Mereghetti et al 2016).…”

Section: Comparison With Other Pulsar Modulation Phenomenamentioning

confidence: 99%

Periodic longitude-stationary non-drift emission in core-single radio pulsar B1946+35

Mitra

Rankin

2017

Monthly Notices of the Royal Astronomical Society

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Radio pulsar PSR B1946+35 is a classical example of a core/cone triple pulsar where the observer's line-of-sight cuts the emission beam centrally. In this paper we perform a detailed single-pulse polarimetric analysis of B1946+35 using sensitive Arecibo archival and new observations at 1.4 and 4.6 GHz to re-establish the pulsar's classification wherein a pair of inner conal "outriders" surround a central core component. The new 1.4 GHz observation consisted of a long single pulse sequence of 6678 pulses, and its fluctuation spectral analysis revealed that the pulsar shows a time-varying amplitude modulation, where for a thousand periods or so the spectra have a broad low frequency "red" excess and then at intervals they suddenly exhibit highly periodic longitude-stationary modulation of both the core and conal components for several hundred periods. The fluctuations of the leading conal and the core components are in phase, while those in the trailing conal component in counterphase. These fluctuation properties are consistant with shorter pulse sequence analyses reported in an earlier study by Weltevrede et al. (2006Weltevrede et al. ( , 2007 as well as in our shorter pulse sequence data sets. We argue that this dual modulation of core and conal emission cannot be understood by a model where subpulse modulation is associated with the plasma E×B drift phenomenon. Rather the effect appears to represent a kind of periodic emissionpattern change over timescales of ∼18 s (or 25 pulsar periods), which has not been reported previously for any other pulsar.

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“…While a single LOFAR station as used here only has a limited effective area or telescope gain, it allows for very flexible scheduling, especially for long observations. The capability of this setup for pulsar science has already been demonstrated (Rajwade et al 2016;Mereghetti et al 2016;Bondonneau et al 2017Bondonneau et al , 2020Michilli et al 2018;Hermsen et al 2018;Donner et al 2019;Porayko et al 2019;Tiburzi et al 2019).…”

Section: Observationsmentioning

confidence: 93%

Follow-up of 27 radio-quiet gamma-ray pulsars at 110–190 MHz using the international LOFAR station FR606

Grießmeier

Smith

Theureau

et al. 2021

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Context. The Fermi Large Area Telescope has detected over 260 gamma-ray pulsars. About one quarter of these are labeled as radio-quiet, that is they either have radio flux densities < 30 μJy at 1400 MHz, or they are not detected at all in the radio domain. In the population of nonrecycled gamma-ray pulsars, the fraction of radio-quiet pulsars is higher, about one half. Aims. Most radio observations of gamma-ray pulsars have been performed at frequencies between 300 MHz and 2 GHz. However, pulsar radio fluxes increase rapidly with decreasing frequency, and their radio beams often broaden at low frequencies. As a consequence, some of these pulsars might be detectable at low radio frequencies even when no radio flux is detected above 300 MHz. Our aim is to test this hypothesis with low-frequency radio observations. Methods. We have observed 27 Fermi-discovered gamma-ray pulsars with the international LOw Frequency ARray (LOFAR) station FR606 in single-station mode. We used the LOFAR high band antenna band (110−190 MHz), with an average observing time of 13 h per target. Part of the data had to be discarded due to radio frequency interference. On average, we kept 9 h of observation per target after the removal of affected datasets, resulting in a sensitivity for pulse-averaged flux on the order of 1−10 mJy. Results. We do not detect radio pulsations from any of the 27 sources, and we establish stringent upper limits on their low-frequency radio fluxes. These nondetections are compatible with the upper limits derived from radio observations at other frequencies. We also determine the pulsars’ geometry from the gamma-ray profiles to see for which pulsars the low-frequency radio beam is expected to cross Earth. Conclusions. This set of observations provides the most constraining upper limits on the flux density at 150 MHz for 27 radio-quiet gamma-ray pulsars. In spite of the beam-widening expected at low radio frequencies, most of our nondetections can be explained by an unfavorable viewing geometry; for the remaining observations, especially those of pulsars detected at higher frequencies, the nondetection is compatible with insufficient sensitivity.

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Simultaneous radio and X-ray observations of PSR B0611+22

Cited by 20 publications

References 54 publications

A census of the pulsar population observed with the international LOFAR station FR606 at low frequencies (25–80 MHz)

A census of the pulsar population observed with the international LOFAR station FR606 at low frequencies (25–80 MHz)

Periodic longitude-stationary non-drift emission in core-single radio pulsar B1946+35

Follow-up of 27 radio-quiet gamma-ray pulsars at 110–190 MHz using the international LOFAR station FR606

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