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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 (E) over dot = 3.5 x 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) x 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/E similar or equal to 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), drift scan search, space telescope, psr j0218+4232, x-rays, emission, catalog
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:kth:diva-18550DOI: 10.1088/0004-637x/699/2/1171ISI: 000267401500026ScopusID: 2-s2.0-68149172308OAI: diva2:336597

QC 20100525

Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2016-04-21Bibliographically approved

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Axelsson, MagnusRyde, FelixBattelino, MilanConrad, Jan
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