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Title:
A Survey of 56 Midlatitude EGRET Error Boxes for Radio Pulsars
Authors:
Crawford, Fronefield; Roberts, Mallory S. E.; Hessels, Jason W. T.; Ransom, Scott M.; Livingstone, Margaret; Tam, Cindy R.; Kaspi, Victoria M.
Affiliation:
AA(Department of Physics and Astronomy, Franklin and Marshall College, Lancaster, PA 17604; .; Department of Physics, Haverford College, Haverford, PA 19041.), AB(Department of Physics, McGill University, Montreal, QC H3A 2T8, Canada.; Eureka Scientific, Inc., 2452 Delmer Street, Suite 100, Oakland, CA 94602.), AC(Department of Physics, McGill University, Montreal, QC H3A 2T8, Canada.), AD(Department of Physics, McGill University, Montreal, QC H3A 2T8, Canada.; National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903.), AE(Department of Physics, McGill University, Montreal, QC H3A 2T8, Canada.), AF(Department of Physics, McGill University, Montreal, QC H3A 2T8, Canada.), AG(Department of Physics, McGill University, Montreal, QC H3A 2T8, Canada.)
Publication:
The Astrophysical Journal, Volume 652, Issue 2, pp. 1499-1507. (ApJ Homepage)
Publication Date:
12/2006
Origin:
UCP
ApJ Keywords:
Gamma Rays: Observations, Stars: Pulsars: General
DOI:
10.1086/508403
Bibliographic Code:
2006ApJ...652.1499C

Abstract

We have conducted a radio pulsar survey of 56 unidentified γ-ray sources from the third EGRET catalog that are at intermediate Galactic latitudes (5deg<|b|<73deg). For each source, four interleaved 35 minute pointings were made with the 13 beam, 1400 MHz multibeam receiver on the Parkes 64 m radio telescope. This covered the 95% error box of each source at a limiting sensitivity of ~0.2 mJy to pulsed radio emission for periods P>~10 ms and dispersion measures <~50 pc cm-3. Roughly half of the unidentified γ-ray sources at |b|>5deg with no proposed active galactic nucleus counterpart were covered in this survey. We detected nine isolated pulsars and four recycled binary pulsars, with three from each class being new discoveries. Timing observations suggest that only one of the pulsars has a spin-down luminosity that is even marginally consistent with the inferred luminosity of its coincident EGRET source. Our results suggest that population models, which include the Gould Belt as a component, overestimate the number of isolated pulsars among the midlatitude Galactic γ-ray sources, and that it is unlikely that Gould Belt pulsars make up the majority of these sources. However, the possibility of steep pulsar radio spectra and the confusion of terrestrial radio interference with long-period pulsars (P>~200 ms) having very low dispersion measures (<~10 pc cm-3, expected for sources at a distance of less than about 1 kpc) prevent us from strongly ruling out this hypothesis. Our results also do not support the hypothesis that millisecond pulsars make up the majority of these sources. Nonpulsar source classes should therefore be further investigated as possible counterparts to the unidentified EGRET sources at intermediate Galactic latitudes.
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