Could the unidentified EGRET sources in the Gould Belt be of pulsar origin? | Zendy

Bing Zhang | Zendy

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Could the unidentified EGRET sources in the Gould Belt be of pulsar origin?

Author(s) -

Bing Zhang

Publication year - 2001

Publication title -

aip conference proceedings

Language(s) - English

Resource type - Conference proceedings

SCImago Journal Rank - 0.177

H-Index - 75

eISSN - 1551-7616

pISSN - 0094-243X

DOI - 10.1063/1.1370872

Subject(s) - egret , pulsar , physics , astrophysics , astronomy , population , line of sight , beam (structure) , gamma ray , polar , optics , demography , sociology

We explore the possibility, within the polar cap model, that at least some of the recently identified new population of EGRET sources in the Gould Belt sources are γ-ray pulsars, viewed at large angles to the magnetic axis, such that the line-of-sight misses both the bright gamma-ray double cone and the radio beam. We estimate that the detectability of such off-beam gamma-ray sources is about a factor of 4–5 times higher than that of the on-beam sources. The off-beam γ-ray pulsars also have a faint, soft nature, which is consistent with the observed properties of the Gould Belt sources. We conclude that at least some of the middle latitude sources might be such off-beam gamma-ray pulsars if they are indeed in the Gould Belt.

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