Discovery of high-energy Gamma-Ray pulsations from PSR J2021+3651 with AGILE

J. P. Halpern, F. Camilo, A. Giuliani, E. V. Gotthelf, M. A. Mclaughlin, R. Mukherjee, A. Pellizzoni, S. M. Ransom, Mallory Roberts, M. Tavani

Research output: Contribution to journalArticle

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.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume688
Issue number1 PART 2
DOIs
StatePublished - Jan 1 2008

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rays
gamma rays
radio
energy
pulsars
pulses
observatory
Gamma Ray Observatory
cycles
fold
accelerators
telescopes
photons

Keywords

  • Gamma rays
  • Observations-pulsars

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Halpern, J. P., Camilo, F., Giuliani, A., Gotthelf, E. V., Mclaughlin, M. A., Mukherjee, R., ... Tavani, M. (2008). Discovery of high-energy Gamma-Ray pulsations from PSR J2021+3651 with AGILE. Astrophysical Journal, 688(1 PART 2). https://doi.org/10.1086/594117

Discovery of high-energy Gamma-Ray pulsations from PSR J2021+3651 with AGILE. / Halpern, J. P.; Camilo, F.; Giuliani, A.; Gotthelf, E. V.; Mclaughlin, M. A.; Mukherjee, R.; Pellizzoni, A.; Ransom, S. M.; Roberts, Mallory; Tavani, M.

In: Astrophysical Journal, Vol. 688, No. 1 PART 2, 01.01.2008.

Research output: Contribution to journalArticle

Halpern, JP, Camilo, F, Giuliani, A, Gotthelf, EV, Mclaughlin, MA, Mukherjee, R, Pellizzoni, A, Ransom, SM, Roberts, M & Tavani, M 2008, 'Discovery of high-energy Gamma-Ray pulsations from PSR J2021+3651 with AGILE', Astrophysical Journal, vol. 688, no. 1 PART 2. https://doi.org/10.1086/594117
Halpern JP, Camilo F, Giuliani A, Gotthelf EV, Mclaughlin MA, Mukherjee R et al. Discovery of high-energy Gamma-Ray pulsations from PSR J2021+3651 with AGILE. Astrophysical Journal. 2008 Jan 1;688(1 PART 2). https://doi.org/10.1086/594117
Halpern, J. P. ; Camilo, F. ; Giuliani, A. ; Gotthelf, E. V. ; Mclaughlin, M. A. ; Mukherjee, R. ; Pellizzoni, A. ; Ransom, S. M. ; Roberts, Mallory ; Tavani, M. / Discovery of high-energy Gamma-Ray pulsations from PSR J2021+3651 with AGILE. In: Astrophysical Journal. 2008 ; Vol. 688, No. 1 PART 2.
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