# Fermi Large Area Telescope observations of PSR J1836+5925

Abstract : The discovery of the gamma-ray pulsar PSR J1836+5925, powering the formerly unidentified EGRET source 3EG J1835+5918, was one of the early accomplishments of the Fermi Large Area Telescope (LAT). Sitting 25 degrees off the Galactic plane, PSR J1836+5925 is a 173 ms pulsar with a characteristic age of 1.8 million years, a spindown luminosity of 1.1$\times10^{34}$ erg s$^{-1}$, and a large off-peak emission component, making it quite unusual among the known gamma-ray pulsar population. We present an analysis of one year of LAT data, including an updated timing solution, detailed spectral results and a long-term light curve showing no indication of variability. No evidence for a surrounding pulsar wind nebula is seen and the spectral characteristics of the off-peak emission indicate it is likely magnetospheric. Analysis of recent XMM observations of the X-ray counterpart yields a detailed characterization of its spectrum, which, like Geminga, is consistent with that of a neutron star showing evidence for both magnetospheric and thermal emission.
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http://hal.in2p3.fr/in2p3-00475654
Contributor : Virginie Mas <>
Submitted on : Thursday, April 22, 2010 - 3:18:05 PM
Last modification on : Friday, December 18, 2020 - 12:54:08 PM

### Citation

A. A. Abdo, Markus Ackermann, Marco Ajello, W. B. Atwood, Luca Baldini, et al.. Fermi Large Area Telescope observations of PSR J1836+5925. The Astrophysical Journal, American Astronomical Society, 2010, 712, pp.1209-1218. ⟨10.1088/0004-637X/712/2/1209⟩. ⟨in2p3-00475654⟩

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