PSR J2021+3651: A young radio pulsar coincident with an unidentified egret γ-ray source

Mallory S.E. Roberts; Jason W.T. Hessels; Scott M. Ransom; Victoria M. Kaspi; Paulo C.C. Freire; Fronefield Crawford; Duncan R. Lorimer

doi:10.1086/344082

PSR J2021+3651: A young radio pulsar coincident with an unidentified egret γ-ray source

Mallory S.E. Roberts, Jason W.T. Hessels, Scott M. Ransom, Victoria M. Kaspi, Paulo C.C. Freire, Fronefield Crawford, Duncan R. Lorimer

Physics

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Abstract

We report on a deep search for radio pulsations toward five unidentified ASCA X-ray sources coincident with EGRET γ-ray sources. This search has led to the discovery of a young and energetic pulsar using data obtained with the new Wideband Arecibo Pulsar Processor. PSR J2021+3651 is likely associated with the X-ray source AX J2021.1+3651, which in turn is likely associated with the COS B high-energy γ-ray source 2CG 075+00, also known as GeV J2020+3658 or 3EG J2021+3716. PSR J2021+3651 has a rotation period of P ∼ 104 ms and P ̇ ∼ 9.6 × 10^-14, implying a characteristic age of τ _c ∼ 17 kyr and a spin-down luminosity of Ė ∼ 3.4 × 10³⁶ ergs s^-1. The dispersion measure DM ∼ 371 pc cm^-3 is by far the highest of any observed pulsar in the Galactic longitude range 55° < l < 80°. This DM suggests a distance d ≳ 10 kpc and a high γ-ray efficiency of ∼15%, but the true distance may be closer if there is a significant contribution to the DM from excess gas in the Cygnus region. The implied luminosity of the associated X-ray source suggests the X-ray emission is dominated by a pulsar wind nebula unresolved by ASCA.

Original language	English (US)
Pages (from-to)	L19-L22
Journal	Astrophysical Journal
Volume	577
Issue number	1 II
DOIs	https://doi.org/10.1086/344082
State	Published - Sep 20 2002

Keywords

Gamma rays: observations
Pulsars: general
Stars: neutron

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/344082

Cite this

@article{efdc9c033afe460c9751f4849390025b,

title = "PSR J2021+3651: A young radio pulsar coincident with an unidentified egret γ-ray source",

abstract = "We report on a deep search for radio pulsations toward five unidentified ASCA X-ray sources coincident with EGRET γ-ray sources. This search has led to the discovery of a young and energetic pulsar using data obtained with the new Wideband Arecibo Pulsar Processor. PSR J2021+3651 is likely associated with the X-ray source AX J2021.1+3651, which in turn is likely associated with the COS B high-energy γ-ray source 2CG 075+00, also known as GeV J2020+3658 or 3EG J2021+3716. PSR J2021+3651 has a rotation period of P ∼ 104 ms and P{\. } ∼ 9.6 × 10-14, implying a characteristic age of τ c ∼ 17 kyr and a spin-down luminosity of Ė ∼ 3.4 × 1036 ergs s-1. The dispersion measure DM ∼ 371 pc cm-3 is by far the highest of any observed pulsar in the Galactic longitude range 55° < l < 80°. This DM suggests a distance d ≳ 10 kpc and a high γ-ray efficiency of ∼15%, but the true distance may be closer if there is a significant contribution to the DM from excess gas in the Cygnus region. The implied luminosity of the associated X-ray source suggests the X-ray emission is dominated by a pulsar wind nebula unresolved by ASCA.",

keywords = "Gamma rays: observations, Pulsars: general, Stars: neutron",

author = "Roberts, {Mallory S.E.} and Hessels, {Jason W.T.} and Ransom, {Scott M.} and Kaspi, {Victoria M.} and Freire, {Paulo C.C.} and Fronefield Crawford and Lorimer, {Duncan R.}",

note = "Funding Information: We thank Jim Cordes for useful discussions. We acknowledge support from NSERC, CFI, an NSF CAREER Award, and a Sloan Fellowship. M. S. E. R. is a Quebec Merit fellow. S. M. R. is a Tomlinson fellow. J. W. T. H. is an NSERC PGS A fellow. V. M. K. is a Canada Research Chair. The Arecibo Observatory is part of the National Astronomy and Ionosphere Center, which is operated by Cornell University under a co-operative agreement with the National Science Foundation. The Parkes radio telescope is part of the Australia Telescope, which is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO.",

year = "2002",

month = sep,

day = "20",

doi = "10.1086/344082",

language = "English (US)",

volume = "577",

pages = "L19--L22",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "1 II",

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TY - JOUR

T1 - PSR J2021+3651

T2 - A young radio pulsar coincident with an unidentified egret γ-ray source

AU - Roberts, Mallory S.E.

AU - Hessels, Jason W.T.

AU - Ransom, Scott M.

AU - Kaspi, Victoria M.

AU - Freire, Paulo C.C.

AU - Crawford, Fronefield

AU - Lorimer, Duncan R.

N1 - Funding Information: We thank Jim Cordes for useful discussions. We acknowledge support from NSERC, CFI, an NSF CAREER Award, and a Sloan Fellowship. M. S. E. R. is a Quebec Merit fellow. S. M. R. is a Tomlinson fellow. J. W. T. H. is an NSERC PGS A fellow. V. M. K. is a Canada Research Chair. The Arecibo Observatory is part of the National Astronomy and Ionosphere Center, which is operated by Cornell University under a co-operative agreement with the National Science Foundation. The Parkes radio telescope is part of the Australia Telescope, which is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO.

PY - 2002/9/20

Y1 - 2002/9/20

N2 - We report on a deep search for radio pulsations toward five unidentified ASCA X-ray sources coincident with EGRET γ-ray sources. This search has led to the discovery of a young and energetic pulsar using data obtained with the new Wideband Arecibo Pulsar Processor. PSR J2021+3651 is likely associated with the X-ray source AX J2021.1+3651, which in turn is likely associated with the COS B high-energy γ-ray source 2CG 075+00, also known as GeV J2020+3658 or 3EG J2021+3716. PSR J2021+3651 has a rotation period of P ∼ 104 ms and P ̇ ∼ 9.6 × 10-14, implying a characteristic age of τ c ∼ 17 kyr and a spin-down luminosity of Ė ∼ 3.4 × 1036 ergs s-1. The dispersion measure DM ∼ 371 pc cm-3 is by far the highest of any observed pulsar in the Galactic longitude range 55° < l < 80°. This DM suggests a distance d ≳ 10 kpc and a high γ-ray efficiency of ∼15%, but the true distance may be closer if there is a significant contribution to the DM from excess gas in the Cygnus region. The implied luminosity of the associated X-ray source suggests the X-ray emission is dominated by a pulsar wind nebula unresolved by ASCA.

AB - We report on a deep search for radio pulsations toward five unidentified ASCA X-ray sources coincident with EGRET γ-ray sources. This search has led to the discovery of a young and energetic pulsar using data obtained with the new Wideband Arecibo Pulsar Processor. PSR J2021+3651 is likely associated with the X-ray source AX J2021.1+3651, which in turn is likely associated with the COS B high-energy γ-ray source 2CG 075+00, also known as GeV J2020+3658 or 3EG J2021+3716. PSR J2021+3651 has a rotation period of P ∼ 104 ms and P ̇ ∼ 9.6 × 10-14, implying a characteristic age of τ c ∼ 17 kyr and a spin-down luminosity of Ė ∼ 3.4 × 1036 ergs s-1. The dispersion measure DM ∼ 371 pc cm-3 is by far the highest of any observed pulsar in the Galactic longitude range 55° < l < 80°. This DM suggests a distance d ≳ 10 kpc and a high γ-ray efficiency of ∼15%, but the true distance may be closer if there is a significant contribution to the DM from excess gas in the Cygnus region. The implied luminosity of the associated X-ray source suggests the X-ray emission is dominated by a pulsar wind nebula unresolved by ASCA.

KW - Gamma rays: observations

KW - Pulsars: general

KW - Stars: neutron

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U2 - 10.1086/344082

DO - 10.1086/344082

M3 - Article

AN - SCOPUS:0041970890

SN - 0004-637X

VL - 577

SP - L19-L22

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1 II

ER -

PSR J2021+3651: A young radio pulsar coincident with an unidentified egret γ-ray source

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