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The Astrophysical Journal 744 (2012) 33
Pulsed Gamma Rays from the Original Millisecond and Black Widow Pulsars: a case for Caustic Radio Emission?
L. Guillemot, T. J. Johnson, C. Venter, M. Kerr, B. Pancrazi1, M. Livingstone, G. H. Janssen, P. Jaroenjittichai, M. Kramer, I. Cognard2, 3, B. W. Stappers, A. K. Harding, F. Camilo, C. M. Espinoza, P. C. C. Freire, F. Gargano, J. E. Grove, S. Johnston, P. F. Michelson, A. Noutsos, D. Parent, S. M. Ransom, P. S. Ray, R. Shannon, D. A. Smith4, G. Theureau2, 3, S. E. Thorsett, N. Webb

We report the detection of pulsed gamma-ray emission from the fast millisecond pulsars (MSPs) B1937+21 (also known as J1939+2134) and B1957+20 (J1959+2048) using 18 months of survey data recorded by the \emph{Fermi} Large Area Telescope (LAT) and timing solutions based on radio observations conducted at the Westerbork and Nançay radio telescopes. In addition, we analyzed archival \emph{RXTE} and \emph{XMM-Newton} X-ray data for the two MSPs, confirming the X-ray emission properties of PSR B1937+21 and finding evidence ($\sim 4\sigma$) for pulsed emission from PSR B1957+20 for the first time. In both cases the gamma-ray emission profile is characterized by two peaks separated by half a rotation and are in close alignment with components observed in radio and X-rays. These two pulsars join PSRs J0034-0534 and J2214+3000 to form an emerging class of gamma-ray MSPs with phase-aligned peaks in different energy bands. The modeling of the radio and gamma-ray emission profiles suggests co-located emission regions in the outer magnetosphere.
1 :  IRAP - Institut de recherche en astrophysique et planétologie
2 :  LPCE - Laboratoire de physique et chimie de l'environnement
3 :  USN - Unité Scientifique de la Station de Nançay
4 :  CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan
Physique/Astrophysique/Phénomènes cosmiques de haute energie

Planète et Univers/Astrophysique/Phénomènes cosmiques de haute energie
gamma rays: general - pulsars: general - pulsars: individual (PSR B1937+21 – PSR B1957+20) - radiation mechanisms: non-thermal