Optical observations of PSR J0205+6449 - the next optical pulsar?

P. Moran, R. P. Mignani, S. Collins, A. De Luca, N. Rea, A. Shearer

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    Abstract

    PSR J0205+6449 is a young (~5400 yr), Crab-like pulsar detected in radio and at X-ray and γ-ray energies and has the third largest spin-down flux among known rotation-powered pulsars. It also powers a bright synchrotron nebula detected in the optical and X-rays. At a distance of ~3.2 kpc and with an extinction comparable to the Crab, PSR J0205+6449 is an obvious target for optical observations. We observed PSR J0205+6449 with several optical facilities, including 8m class ground-based telescopes, such as the Gemini and the Gran Telescopio Canarias.We detected a point source, at a significance of 5.5s, of magnitude í ~ 25.5, at the centre of the optical synchrotron nebula, coincident with the very accurate Chandra and radio positions of the pulsar. Thus, we discovered a candidate optical counterpart to PSR J0205+6449. The pulsar candidate counterpart is also detected in the ǵ (~27.4) band and weakly in the ŕ (~26.2) band. Its optical spectrum is fitted by a power law with photon index G O = 1.9 ± 0.5, proving that the optical emission, if of non-thermal origin, is as expected for a young pulsar. The optical photon index is similar to the X-ray one (G X = 1.77 ± 0.03), although the optical fluxes are below the extrapolation of the X-ray power spectrum. This would indicate the presence of a double spectral break between the X-ray and optical energy range, at variance with what is observed for the Crab and Vela pulsars, but similar to the Large Magellanic Cloud pulsar PSR B0540-69. © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.
    Original languageEnglish
    Article numberstt1573
    Pages (from-to)401-412
    JournalMonthly Notices of the Royal Astronomical Society
    Volume436
    Issue number1
    DOIs
    Publication statusPublished - 1 Nov 2013

    Keywords

    • Individual
    • PSR J0205+6449
    • Pulsars

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  • Cite this

    Moran, P., Mignani, R. P., Collins, S., De Luca, A., Rea, N., & Shearer, A. (2013). Optical observations of PSR J0205+6449 - the next optical pulsar? Monthly Notices of the Royal Astronomical Society, 436(1), 401-412. [stt1573]. https://doi.org/10.1093/mnras/stt1573