Radio Searches of Fermi LAT Sources and Blind Search Pulsars: The Fermi Pulsar Search Consortium

Ray, Paul S.; Theureau, G.; Shannon, R. M.; Abdo, A. A.; Gupta, Yashwant; Roberts, M. S. E.; Freire, P. C. C.; Keith, Michael; Stappers, B. W.; Parkinson, P. M. Saz; Guillemot, L.; Ziegler, M.; Bhattacharya, D.; Cognard, I.; McLaughlin,; Weltevrede, P.; Parent, D.; Harding, A. K.; Michelson, P. F.; Romani, Roger W.; Thompson, D. J.; Roy, Jayanta; Kerr, M.; Johnston, S.; Ransom, Scott M.; Bhattacharyya, Bhaswati; Camilo, F.; Smith, David A.; Krämer, M.; Hessels, J. W. T.; Ferrara, E. C.; Wood, K. S.

doi:10.48550/arxiv.1205.3089

Cited by 82 publications

(102 citation statements)

References 30 publications

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“…An unexpected finding from the all-sky GeV γ-ray survey of the Fermi Large Area Telescope (LAT) is that MSPs channel a substantial fraction of their spindown energy into γ-rays, making them nearly ubiquitous γ-ray emitters (Abdo et al 2013). Radio, X-ray, and optical follow-up of Fermi -LAT sources have revealed a large population of short orbital period "spider" MSP binaries with hydrogen-rich, low mass (redback; ∼ 0.1-0.5M ), or ultra light (black widow; 0.05M ) secondaries being ablated by the MSP (Ray et al 2012;Roberts 2013). These binaries had mostly been hidden from all-sky radio surveys by extensive eclipses, and can be challenging to detect as pulsars even with deep pointed observations.…”

mentioning

confidence: 99%

Multiwavelength evidence for a new flare-mode transitional millisecond pulsar

Strader,

Swihart,

Urquhart

et al. 2021

Preprint

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We report the discovery of a new low-mass X-ray binary near the center of the unassociated Fermi GeV γ-ray source 4FGL J0540.0-7552. The source shows the persistent presence of an optical accretion disk and exhibits extreme X-ray and optical variability. It also has an X-ray spectrum well-fit by a hard power law with Γ = 1.8 and a high ratio of X-ray to γ-ray flux. Together, these properties are consistent with the classification of the binary as a transitional millisecond pulsar (tMSP) in the sub-luminous disk state. Uniquely among the candidate tMSPs, 4FGL J0540.0-7552 shows consistent optical, X-ray, and γ-ray evidence for having undergone a state change, becoming substantially brighter in the optical and X-rays and fainter in GeV γ-rays sometime in mid-2013. In its current sub-luminous disk state, and like one other candidate tMSP in the Galactic field, 4FGL J0540.0-7552 appears to always be in an X-ray "flare mode", indicating that this could be common phenomenology for tMSPs.

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mentioning

confidence: 99%

Multiwavelength evidence for a new flare-mode transitional millisecond pulsar

Strader,

Swihart,

Urquhart

et al. 2021

Preprint

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“…The number of redback MSPs and strong candidates has grown dramatically in recent years, in large part due to targeted radio, optical, and X-ray searches of unassociated Fermi Large Area Telescope γ-ray sources (e.g., Ray et al 2012;Strader et al 2014). In Table 4 we have compiled the spin, orbital and X-ray properties (where available) of the current sample of published redbacks in globular clusters and the field of the Galaxy.…”

Section: Discussionmentioning

confidence: 99%

A Deep Chandra X-ray Observatory Study of the Millisecond Pulsar Population in the Globular Cluster Terzan 5

Bogdanov,

Bahramian,

Heinke

et al. 2020

Preprint

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We present an analysis of 745.6 ks of archival Chandra X-ray Observatory Advanced CCD Imaging Spectrometer data accumulated between 2000 and 2016 of the millisecond pulsar (MSP) population in the rich Galactic globular cluster Terzan 5. Eight of the 37 MSPs with precise positions are found to have plausible X-ray source matches. Despite the deep exposure, the remaining MSPs are either marginally detected or have no obvious X-ray counterparts, which can be attributed to the typically soft thermal spectra of rotation-powered MSPs, which are strongly attenuated by the high intervening absorbing column (∼ 10 22 cm −2 ) towards the cluster, and in some instances severe source crowding/blending. For the "redback" MSP binaries, PSRs J1748−2446P and J1748−2446ad, and the "black widow" binary PSRs J1748−2446O, we find clear evidence for large-amplitude X-ray variability at the orbital period consistent with an intrabinary shock origin. The third redback MSP in the cluster, PSR J1748−2446A, shows large amplitude variations in flux on time scales of years, possibility due to state transitions or intense flaring episodes from the secondary star.

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“…Poynting flux that is estimated by the magnetic dipole emission (for review, [54][55][56]). In considering the observability, we assume that the radiation efficiency is approximately equal to that of pulsars suggested by observations [57][58][59][60][61][62]. First, we consider the luminosity of a BNS just before its merger.…”

Section: Possible Precursor Radiation and Its Observabilitymentioning

confidence: 99%

Analytic properties of electromagnetic field of binary compact stars and electromagnetic precursors to gravitational waves

Wada¹,

Shibata²,

Ioka³

2020

Preprint

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We analytically study the properties of the electromagnetic field in vacuum around close binary compact stars containing at least one neutron star. We show that the orbital motion of the neutron star induces high multipole modes of the electromagnetic field just before the merger. These modes are superimposed to form a spiral arm configuration and its edge is found to be a likely site for magnetic reconnection. These modes also enhance the total Poynting flux from neutron star binaries by a factor of 2-4. We also indicate that the electric field induced by the orbital motion lead to a magnetosphere around binaries and estimate its plasma density, which has a different parameter dependence than Goldreich-Julian density. With these properties, we discuss possible electromagnetic counterparts to gravitational wave events, and identify radio precursors, such as fast radio bursts, as the most promising observational targets.

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Radio Searches of Fermi LAT Sources and Blind Search Pulsars: The Fermi Pulsar Search Consortium

Cited by 82 publications

References 30 publications

Multiwavelength evidence for a new flare-mode transitional millisecond pulsar

Multiwavelength evidence for a new flare-mode transitional millisecond pulsar

A Deep Chandra X-ray Observatory Study of the Millisecond Pulsar Population in the Globular Cluster Terzan 5

Analytic properties of electromagnetic field of binary compact stars and electromagnetic precursors to gravitational waves

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