DISCOVERY OF HIGH-ENERGY GAMMA-RAY PULSATIONS FROM PSR J2021+3651 WITH AGILE

被引：37

作者：

Halpern, J. P. ^{[1
]}

Camilo, F. ^{[1
]}

Giuliani, A. ^{[2
]}

Gotthelf, E. V. ^{[1
]}

McLaughlin, M. A. ^{[3
]}

Mukherjee, R. ^{[4
]}

Pellizzoni, A. ^{[2
]}

Ransom, S. M. ^{[5
]}

Roberts, M. S. E. ^{[6
]}

Tavani, M. ^{[7
,8
]}

机构：

[1] Columbia Univ, Columbia Astrophys Lab, New York, NY 10027 USA

[2] INAF IASF Milano, I-20133 Milan, Italy

[3] W Virginia Univ, Dept Phys, Morgantown, WV 26501 USA

[4] Columbia Univ, Berea Coll, Dept Phys & Astron, New York, NY 10027 USA

[5] Natl Radio Astron Observ, Charlottesville, VA 22903 USA

[6] Eureka Sci Inc, Oakland, CA 94602 USA

[7] INAF IASF Roma, I-00133 Rome, Italy

[8] Univ Roma Tor Vergata, Dipartimento Fis, I-00133 Rome, Italy

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2008年 / 688卷 / 01期

关键词：

gamma rays: observations; pulsars: individual (PSR J2021+3651);

D O I：

10.1086/594117

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 gamma-ray source 2CG 075 + 00 p 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 gamma-ray photons. Here, we report the discovery of gamma-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 gamma-ray pulse consists of two sharp peaks separated by 0.47 +/- 0.01 cycles. The single radio pulse leads the first gamma-ray peak by 0.165 +/- 0.010 cycles. These properties are similar to those of other gamma-ray pulsars, and the phase relationship of the peaks can be interpreted in the context of the outer-gap accelerator model for gamma-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.

引用

页码：L33 / L36

页数：4

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