Radio-Loud and Radio-Quiet Gamma-Ray Pulsars from the Galaxy and the Gould Belt

Gonthier, P.; Guilder, R. Van; Grenier, I. A.; Perrot, C.; Harding, A. K.

doi:10.1007/s10509-005-7577-y

Cited by 10 publications

(6 citation statements)

References 15 publications

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“…This test, however, may turn out to be less conclusive for young pulsars which have high-altitude radio conal beams closer to the high-energy beams [29,26]. The current studies of radio-quiet and radio-loud statistics using the polar cap and the slot gap models are compatible with the detection by EGRET of 8 radio pulsars, the existence of Geminga, the presence of a score of unidentified EGRET sources along the Galactic plane and of a handful of sources in the Gould Belt [14,15]. The outer gap can also contribute a large fraction of the unidentified sources at low latitudes [44].…”

Section: Clues From Observationsmentioning

confidence: 60%

Pulsar twinkling and relativity

Grenier¹,

Harding²

2006

AIP Conference Proceedings

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Abstract. The number of pulsars with detected emission at X-ray and γ-ray energies has been steadily growing, showing that beams of high-energy particles are commonly accelerated in pulsar magnetospheres, even though the location and number of acceleration sites remain unsettled. Acceleration near the magnetic poles, close to the polar cap surface or to higher altitudes in the slot gap along the last open field lines, involves an electric field component due to inertial-frame dragging. Acceleration can also take place in the outer magnetosphere where charge depletion due to global currents causes a large electric field along the magnetic field lines. All models require a detailed knowledge of the open magnetosphere geometry and its relativistic distortions. Observational trends with age, spin-down power and magnetic field as well as population synthesis studies in the Galactic disc and the nearby Gould Belt provide useful, however not yet conclusive, constraints on the competing models.

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Section: Clues From Observationsmentioning

confidence: 60%

Pulsar twinkling and relativity

Grenier¹,

Harding²

2006

AIP Conference Proceedings

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“…However, none of these are associated with Gould belt pulsars. Conversely, the sources could be radio-quiet pulsars like Geminga (Gonthier et al 2005) or off-beam γ-ray pulsars Harding & Zhang (2001).…”

Section: Discussionmentioning

confidence: 99%

A survey for pulsars in EGRET error boxes

Champion¹,

McLaughlin²,

Lorimer³

2005

Monthly Notices of the Royal Astronomical Society

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As part of an effort to associate the unidentified EGRET gamma-ray sources with pulsars, error boxes for 19 sources were searched using Arecibo at 327-MHz. The sources were chosen to be out-of-plane and possibly associated with the Gould belt, a nearby starburst region with an enhanced production rate of core-collapse supernovae. The search revealed one new 597-ms pulsar, J2243+1518, within the error box of the EGRET source 3EG J2243+1509. The spin-down energy loss rate of the new pulsar is not nearly sufficient to power the gamma-ray source and so the pulsar is very unlikely to be associated. Simulations we have carried out show that any pulsars at Gould belt distances should have been detected by the survey. This suggests that either the EGRET sources associated with the Gould belt are not pulsars, or that the minimum of the pulsar luminosity function is lower than the ~1.5 mJy kpc^2 inferred from the population of normal pulsars.Comment: 5 pages, 1 figure. Accepted for publication in MNRA

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“…Very detailed physical pulsar population synthesis studies by Gonthier et al (2002) and Gonthier et al (2004) using their polar-cap model were aimed at establishing the relation between radio and γ-ray properties and predicting detections for future missions like GLAST. Harding & Zhang (2001); Gonthier et al (2003); Harding et al (2004); Gonthier et al (2005) Cheng et al (2004) considered the possibility that gamma-ray sources in the Gould's Belt are nearby pulsars. Zhang & Cheng (1998) proposed that pulsars can account for the diffuse GeV excess.…”

Section: Previous Studiesmentioning

confidence: 99%

Source population synthesis and the Galactic diffuse gamma-ray emission

Strong

2007

Astrophys Space Sci

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Population synthesis is used to study the contribution from unresolved sources to the Galactic ridge emission measured by EGRET. Synthesized source counts are compared with the 3rd EGRET catalogue at low and high latitudes. For pulsar-like populations, 5-10% of the emission > 100 MeV comes from sources below the EGRET threshold. A steeper luminosity function can increase this to 20% without violating EGRET source statistics. Less luminous populations can produce much higher values without being detected. Since the unresolved source spectrum is different from the interstellar spectrum, it could provide an explanation of the observed MeV and GeV excesses above the predictions, and we give an explicit example of how this could work.

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Radio-Loud and Radio-Quiet Gamma-Ray Pulsars from the Galaxy and the Gould Belt

Cited by 10 publications

References 15 publications

Pulsar twinkling and relativity

Pulsar twinkling and relativity

A survey for pulsars in EGRET error boxes

Source population synthesis and the Galactic diffuse gamma-ray emission

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