A Survey of 56 Midlatitude EGRET Error Boxes for Radio Pulsars

Crawford, F.; Roberts, M. S. E.; Hessels, J. W. T.; Ransom, S. M.; Livingstone, Margaret A.; Tam, Cindy R.; Kaspi, V. M.

doi:10.1086/508403

Cited by 67 publications

(54 citation statements)

References 47 publications

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“…Figure 31 presents the observed and best-fit light curves of PSR J1614−2230. This is a 3.15 ms pulsar in a binary system with a 8.7 day orbital period discovered by Crawford et al (2006) in radio observations of unassociated EGRET sources. Gamma-ray pulsations from this MSP were first reported by Abdo et al (2009a).…”

Section: Appendix a All Light Curve Fitsmentioning

confidence: 78%

Constraints on the Emission Geometries and Spin Evolution of Gamma-Ray Millisecond Pulsars

Johnson

Venter

Harding

et al. 2014

ApJS

102

157

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Millisecond pulsars (MSPs) are a growing class of gamma-ray emitters. Pulsed gamma-ray signals have been detected from more than 40 MSPs with the Fermi Large Area Telescope (LAT). The wider radio beams and more compact magnetospheres of MSPs enable studies of emission geometries over a broader range of phase space than non-recycled radio-loud gamma-ray pulsars. We have modeled the gamma-ray light curves of 40 LAT-detected MSPs using geometric emission models assuming a vacuum retarded-dipole magnetic field. We modeled the radio profiles using a single-altitude hollow-cone beam, with a core component when indicated by polarimetry; however, for MSPs with gamma-ray and radio light curve peaks occurring at nearly the same rotational phase, we assume that the radio emission is co-located with the gamma rays and caustic in nature. The best-fit parameters and confidence intervals are determined using a maximum likelihood technique. We divide the light curves into three model classes, with gamma-ray peaks trailing (Class I), aligned (Class II), or leading (Class III) the radio peaks. Outer gap and slot gap (two-pole caustic) models best fit roughly equal numbers of Class I and II, while Class III are exclusively fit with pair-starved polar cap models. Distinguishing between the model classes based on typical derived parameters is difficult. We explore the evolution of the magnetic inclination angle with period and spin-down power, finding possible correlations. While the presence of significant off-peak emission can often be used as a discriminator between outer gap and slot gap models, a hybrid model may be needed.

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Section: Appendix a All Light Curve Fitsmentioning

confidence: 78%

Constraints on the Emission Geometries and Spin Evolution of Gamma-Ray Millisecond Pulsars

Johnson

Venter

Harding

et al. 2014

ApJS

102

157

View full text Add to dashboard Cite

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“…A midYGalactic latitude pulsar survey with the Parkes Radio Telescope (Crawford et al 2006) detected three new pulsars in binary systems, none of which easily fit within the standard evolutionary scenarios proposed for the majority of recycled pulsars. One of them, PSR J1744À3922, was independently discovered during the reprocessing of the Parkes Multibeam Pulsar Survey data (Faulkner et al 2004).…”

Section: Introductionmentioning

confidence: 84%

The Unusual Binary Pulsar PSR J1744−3922: Radio Flux Variability, Near‐Infrared Observation, and Evolution

Breton¹,

Roberts²,

Ransom³

et al. 2007

ApJ

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PSR J1744À3922 is a binary pulsar exhibiting highly variable pulsed radio emission. We report on a statistical multifrequency study of the pulsed radio flux variability which suggests that this phenomenon is extrinsic to the pulsar and possibly tied to the companion, although not strongly correlated with orbital phase. The pulsar has an unusual combination of characteristics compared to typical recycled pulsars: a long spin period (172 ms); a relatively high magnetic field strength (1:7 ; 10 10 G); a very circular, compact orbit of 4.6 hr; and a low-mass companion (0.08 M ). These spin and orbital properties are likely inconsistent with standard evolutionary models. We find similarities between the properties of the PSR J1744À3922 system and those of several other known binary pulsar systems, motivating the identification of a new class of binary pulsars. We suggest that this new class could result from: a standard accretion scenario of a magnetar or a high magnetic field pulsar; common envelope evolution with a low-mass star and a neutron star, similar to what is expected for ultracompact X-ray binaries; or accretion induced collapse of a white dwarf. We also report the detection of a possible K 0 ¼ 19:30(15) infrared counterpart at the position of the pulsar, which is relatively bright if the companion is a helium white dwarf at the nominal distance, and discuss its implications for the pulsar's companion and evolutionary history.

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“…Several of the unidentified sources from the 3EG catalog have characteristics that strongly resemble those of known gamma-ray pulsars. A recent survey of EGRET error boxes found several new pulsars, but no clear association could be made with the gamma-ray emission detected by EGRET (Crawford et al 2006). …”

Section: Introductionmentioning

confidence: 95%

A Search for Radio‐Quiet Gamma‐Ray Pulsars in EGRET Data Using a Time‐Differencing Technique

Ziegler

Baughman

Johnson

et al. 2008

ApJ

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Most of the sources in the Galactic plane detected by the EGRET instrument on board the Compton Gamma Ray Observatory remain unidentified. Since the energy spectra of some of them strongly suggest that the gamma-ray emission originates from pulsars, it is interesting to look for pulsations in the data. However, detecting pulsations in gammaray emission by a blind search, that is, without prior knowledge of the pulsar spin parameters, is exceedingly difficult. Previous gamma-ray pulsar blind searches have relied on the execution of very long FFTs, requiring the use of supercomputers. We present a pulsar blind search, based on our time-differencing technique, that can be carried out more economically, in this case, on a standard PC. We present results from the application of this method to a periodicity search on all 271 sources from the third EGRET catalog. No statistically significant new detection was found, for a flux sensitivity of about 10 À6 photons cm À2 s À1 .

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A Survey of 56 Midlatitude EGRET Error Boxes for Radio Pulsars

Cited by 67 publications

References 47 publications

Constraints on the Emission Geometries and Spin Evolution of Gamma-Ray Millisecond Pulsars

Constraints on the Emission Geometries and Spin Evolution of Gamma-Ray Millisecond Pulsars

The Unusual Binary Pulsar PSR J1744−3922: Radio Flux Variability, Near‐Infrared Observation, and Evolution

A Search for Radio‐Quiet Gamma‐Ray Pulsars in EGRET Data Using a Time‐Differencing Technique

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