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Pulsed Gamma Rays from the Millisecond Pulsar J0030+0451 with the Fermi Large Area Telescope
Stockholm University, Faculty of Science, Department of Astronomy.
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
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2009 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 699, no 2, 1171-1177 p.Article in journal (Refereed) Published
Abstract [en]

We report the discovery of gamma-ray pulsations from the nearby isolated millisecond pulsar (MSP) PSR J0030+0451 with the Large Area Telescope on the Fermi Gamma-ray Space Telescope (formerly GLAST). This discovery makes PSR J0030+0451 the second MSP to be detected in gamma rays after PSR J0218+4232, observed by the EGRET instrument on the Compton Gamma-Ray Observatory. The spin-down power \dot{E} = 3.5 \times 10^{33} erg s–1 is an order of magnitude lower than the empirical lower bound of previously known gamma-ray pulsars. The emission profile is characterized by two narrow peaks, 0.07 ± 0.01 and 0.08 ± 0.02 wide, respectively, separated by 0.44 ± 0.02 in phase. The first gamma-ray peak falls 0.15 ± 0.01 after the main radio peak. The pulse shape is similar to that of the "normal" gamma-ray pulsars. An exponentially cutoff power-law fit of the emission spectrum leads to an integral photon flux above 100 MeV of (6.76 ± 1.05 ± 1.35) × 10–8 cm–2 s–1 with cutoff energy (1.7 ± 0.4 ± 0.5) GeV. Based on its parallax distance of (300 ± 90) pc, we obtain a gamma-ray efficiency L_\gamma / \dot{E} \simeq 15% for the conversion of spin-down energy rate into gamma-ray radiation, assuming isotropic emission.

Place, publisher, year, edition, pages
2009. Vol. 699, no 2, 1171-1177 p.
Keyword [en]
gamma rays: observations, pulsars: general, pulsars: individual: PSR J0030+0451
National Category
Astronomy, Astrophysics and Cosmology Astronomy, Astrophysics and Cosmology
Research subject
URN: urn:nbn:se:su:diva-28884DOI: 10.1088/0004-637X/699/2/1171ISI: 000267401500026OAI: diva2:227532
Available from: 2009-07-15 Created: 2009-07-15 Last updated: 2011-02-15Bibliographically approved

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