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• W3105246376 startingPage "17" @default.
• W3105246376 abstract "PSR J2021+3651 is a 17 kyr old rotation powered pulsar detected in the radio, X-rays, and γ-rays. It powers a torus-like pulsar wind nebula with jets, dubbed the Dragonfly, which is very similar to that of the Vela pulsar. The Dragonfly is likely associated with the extended TeV source VER J2019+368 and extended radio emission. We conducted first deep optical observations with the Gran Telescopio Canarias in the Sloan r' band to search for optical counterparts of the pulsar and its nebula. No counterparts were detected down to r' ≳ 27.2 and ≳24.8 for the point-like pulsar and the compact X-ray nebula, respectively. We also reanalyzed Chandra archival X-ray data taking into account an interstellar extinction–distance relation, constructed by us for the Dragonfly line of sight using the red-clump stars as standard candles. This allowed us to constrain the distance to the pulsar, kpc at 90% confidence. It is much smaller than the dispersion measure distance of ∼12 kpc but compatible with a γ-ray pseudo-distance of 1 kpc. Based on that and the optical upper limits, we conclude that PSR J2021+3651, similar to the Vela pulsar, is a very inefficient nonthermal emitter in the optical and X-rays, while its γ-ray efficiency is consistent with an average efficiency for γ-pulsars of similar age. Our optical flux upper limit for the pulsar is consistent with the long-wavelength extrapolation of its X-ray spectrum while the nebula flux upper limit does not constrain the respective extrapolation." @default.
• W3105246376 created "2020-11-23" @default.
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• W3105246376 date "2015-03-16" @default.
• W3105246376 modified "2023-10-15" @default.
• W3105246376 title "OPTICAL OBSERVATIONS OF PSR J2021+3651 IN THE DRAGONFLY NEBULA WITH THE GTC" @default.
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• W3105246376 doi "https://doi.org/10.1088/0004-637x/802/1/17" @default.
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