Pulsed Gamma Rays from the Original Millisecond and Black Widow Pulsars: a case for Caustic Radio Emission?

Abstract

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.

Accepted for publication in the Astrophysical Journal

References in corpus (10)

• TEMPO2, a new pulsar timing package. I: Overview
• Detection of 16 Gamma-Ray Pulsars Through Blind Frequency Searches Using the Fermi LAT
• Precise Gamma-Ray Timing and Radio Observations of 17 Fermi Gamma-Ray Pulsars
• Three Millisecond Pulsars in FERMI LAT Unassociated Bright Sources
• Pulsar Timing for the Fermi Gamma-ray Space Telescope
• Discovery of new gamma-ray pulsars with AGILE
• Altitude-dependent polarization in radio pulsars
• Pulsed Gamma-rays from the millisecond pulsar J0030+0451 with the Fermi Large Area Telescope
• The complex polarization angles of radio pulsars: orthogonal jumps and interstellar scattering
• The annular gap model for gamma-ray emission from young and millisecond pulsars

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