Population statistics study of radio and gamma-ray pulsars in the Galactic plane

Gonthier, P.; Story, Sarah A.; Clow, Brian D.; Harding, A. K.

doi:10.1007/s10509-007-9432-9

Cited by 23 publications

(24 citation statements)

References 19 publications

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“…Estimates of the number of young NSs that can manifest themselves as γ-ray sources show that many of the 56 sources can be related to these compact objects, but a significant fraction of them should not appear as standard radio pulsars Gonthier et al 2007). Depending on the γ-ray emission model, between 30% and 90% of γ-ray pulsars may be Geminga-like objects, according to Harding et al (2007).…”

Section: Discussionmentioning

confidence: 99%

The needle in the haystack: where to look for more isolated cooling neutron stars

Posselt

Попов²,

Haberl

et al. 2008

A&A

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Context. Isolated, cooling neutron stars with thermal X-ray emission remain rarely-detected objects despite many searches investigating the ROSAT data. Aims. We simulate the population of close-by young cooling neutron stars to explain the current observational results. Given the inhomogenity of the neutron star distribution on the sky, it is particularly interesting to identify promising sky regions with respect to ongoing and future searches. Methods. Applying a population synthesis model, the inhomogenity of the progenitor distribution and the inhomogenity of the X-ray absorbing interstellar medium are considered for the first time. The total number of observable neutron stars is derived with respect to ROSAT count rates. In addition, we present sky maps of neutron star locations, and discuss age and distance distributions of the simulated neutron stars. Implications for future searches are discussed. Results. With our advanced model, we can succesfully explain the observed log N − log S distribution of close-by neutron stars. Cooling neutron stars will be most abundant in the directions of rich OB associations. We expect new candidates to be identified behind the Gould Belt, in particular in the Cygnus-Cepheus region. We expect them to be on average younger and hotter than the known population of isolated, cooling neutron stars. In addition, we propose to use data on runaway stars to search for more radio-quiet, cooling neutron stars.

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Section: Discussionmentioning

confidence: 99%

The needle in the haystack: where to look for more isolated cooling neutron stars

Posselt

Попов²,

Haberl

et al. 2008

A&A

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“…This catalog is a milestone in the progress toward the longterm goal of acquiring the most uniform sample of neutron stars possible, so that comparisons with model predictions (e.g., Gonthier et al 2007;Watters & Romani 2011;Pierbattista et al 2012) will allow improved tests of emission models and of their links with their parent population of massive stars or with diffuse Galactic emission. Selection biases can be subtle and the advantage of pulsar searches in the coming years is not so much to increase the absolute numbers, but to be sure to have explored the dark corners of parameter space.…”

Section: The Pulsars Not Seenmentioning

confidence: 99%

THE SECOND FERMI LARGE AREA TELESCOPE CATALOG OF GAMMA-RAY PULSARS

Abdo¹,

Ajello²,

Allafort³

et al. 2013

ApJS

824

1,129

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This catalog summarizes 117 high-confidence 0.1 GeV gamma-ray pulsar detections using three years of data acquired by the Large Area Telescope (LAT) on the Fermi satellite. Half are neutron stars discovered using LAT data through periodicity searches in gamma-ray and radio data around LAT unassociated source positions. The 117 pulsars are evenly divided into three groups: millisecond pulsars, young radio-loud pulsars, and young radio-quiet pulsars. We characterize the pulse profiles and energy spectra and derive luminosities when distance information exists. Spectral analysis of the off-peak phase intervals indicates probable pulsar wind nebula emission for four pulsars, and off-peak magnetospheric emission for several young and millisecond pulsars. We compare the gammaray properties with those in the radio, optical, and X-ray bands. We provide flux limits for pulsars with no observed gamma-ray emission, highlighting a small number of gamma-faint, radio-loud pulsars. The large, varied gamma-ray pulsar sample constrains emission models. Fermi's selection biases complement those of radio surveys, enhancing comparisons with predicted population distributions.

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“…However, most of these studies (Gonthier et al 2002;Cheng and Zhang 1998) have assumed very simplified geometry for the radio and γ -ray emission beams, taking constant solid angles for the radio and γ -ray beams, or assuming random and independent relative orientations for these beams. Gonthier et al (2004Gonthier et al ( , 2007 have more recently explored more complex and realistic emission models for the radio and polar-cap/slot-gap γ -ray beams. Jiang and Zhang (2006) have studied the solid angle dependence of outer gap γ -ray emission beams in their population model, but did not consider the relative orientations of the radio and γ -ray beams.…”

Section: Introductionmentioning

confidence: 99%

“…We then discuss the traditional and revised models for radio emission. The neutron star population synthesis is briefly discussed, since it is presented in more detail by Gonthier et al (2007) in these proceedings. The preliminary results of our study comparing highaltitude slot gap and outer gap models are then presented.…”

Section: Introductionmentioning

confidence: 99%

The Geminga fraction

Harding

Grenier

Gonthier

2007

Astrophys Space Sci

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Radio-quiet γ -ray pulsars like Geminga may account for a number of the unidentified EGRET sources in the Galaxy. The number of Geminga-like pulsars is very sensitive to the geometry of both the γ -ray and radio beams. Recent studies of the shape and polarization of pulse profiles of young radio pulsars have provided evidence that their radio emission originates in wide cone beams at altitudes that are a significant fraction (1-10%) of their light cylinder radius. Such wide radio emission beams will be visible at a much larger range of observer angles than the narrow core components thought to originate at lower altitude. Using 3D geometrical modeling that includes relativistic effects from pulsar rotation, we study the visibility of such radio cone beams as well as that of the γ -ray beams predicted by slot gap and outer gap models. From the results of this study, one can obtain revised predictions for the fraction of Geminga-like, radio quiet pulsars present in the γ -ray pulsar population.

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Population statistics study of radio and gamma-ray pulsars in the Galactic plane

Cited by 23 publications

References 19 publications

The needle in the haystack: where to look for more isolated cooling neutron stars

The needle in the haystack: where to look for more isolated cooling neutron stars

THE SECOND FERMI LARGE AREA TELESCOPE CATALOG OF GAMMA-RAY PULSARS

The Geminga fraction

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