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Title:
Discovery of High-Energy Gamma-Ray Pulsations from PSR J2021+3651 with AGILE
Authors:
Halpern, J. P.; Camilo, F.; Giuliani, A.; Gotthelf, E. V.; McLaughlin, M. A.; Mukherjee, R.; Pellizzoni, A.; Ransom, S. M.; Roberts, M. S. E.; Tavani, M.
Affiliation:
AA(Columbia Astrophysics Laboratory, Columbia University, New York, NY 10027.), AB(Columbia Astrophysics Laboratory, Columbia University, New York, NY 10027.), AC(INAF/IASF-Milano, I-20133 Milan, Italy.), AD(Columbia Astrophysics Laboratory, Columbia University, New York, NY 10027.), AE(Department of Physics, West Virginia University, Morgantown, WV 26501.), AF(Department of Physics and Astronomy, Barnard College, Columbia University, New York, NY 10027.), AG(INAF/IASF-Milano, I-20133 Milan, Italy.), AH(National Radio Astronomy Observatory, Charlottesville, VA 22903.), AI(Eureka Scientific, Inc., Oakland, CA 94602.), AJ(INAF/IASF-Roma, I-00133 Rome, Italy.; Dipartimento di Fisica, Università ``Tor Vergata,'' I-00133 Rome, Italy.)
Publication:
The Astrophysical Journal, Volume 688, Issue 1, pp. L33-L36. (ApJL Homepage)
Publication Date:
11/2008
Origin:
UCP
ApJ Keywords:
Gamma Rays: Observations, Stars: Pulsars: Individual: Alphanumeric: PSR J2021+3651
DOI:
10.1086/594117
Bibliographic Code:
2008ApJ...688L..33H

Abstract

Discovered after the end of the Compton Gamma-Ray Observatory mission, the radio pulsar PSR J2021+3651 was long considered a likely counterpart of the high-energy γ-ray source 2CG 075+00 = 3EG J2021+3716 = GeV J2020+3658, but it could not be confirmed due to the lack of a contemporaneous radio pulsar ephemeris to fold the sparse, archival γ-ray photons. Here, we report the discovery of γ-ray pulsations from PSR J2021+3651 in the 100-1500 MeV range using data from the AGILE satellite gathered over 8 months, folded on a densely sampled, contemporaneous radio ephemeris obtained for this purpose at the Green Bank Telescope. The γ-ray pulse consists of two sharp peaks separated by 0.47+/-0.01 cycles. The single radio pulse leads the first γ-ray peak by 0.165+/-0.010 cycles. These properties are similar to those of other γ-ray pulsars, and the phase relationship of the peaks can be interpreted in the context of the outer-gap accelerator model for γ-ray emission. Pulse-phase-resolved images show that there is only one dominant source, AGL J2020.5+3653 = PSR J2021+3651, in the region previously containing confused sources 3EG J2021+3716 and 3EG J2016+3657.
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