Observations of one young and three middle-aged? -Ray pulsars with the Gran Telescopio Canarias

R. P. Mignani, V. Testa, N. Rea, M. Marelli, D. Salvetti, D. F. Torres, E. De Oña Wilhelmi

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    Abstract

    © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. We used the 10.4 m Gran Telescopio Canarias to search for the optical counterparts to four isolated γ -ray pulsars, all detected in the X-rays by either XMM-Newton or Chandra but not yet in the optical. Three of them are middle-aged pulsars - PSR J1846+0919 (0.36Myr), PSR J2055+2539 (1.2 Myr), PSR J2043+2740 (1.2 Myr) - and one, PSR J1907+0602, is a young pulsar (19.5 kyr). For both PSR J1907+0602 and PSR J2055+2539 we found one object close to the pulsar position. However, in both cases such an object cannot be a viable candidate counterpart to the pulsar. For PSR J1907+0602, because it would imply an anomalously red spectrum for the pulsar and for PSR J2055+2539 because the pulsar would be unrealistically bright (r' = 20.34 ± 0.04) for the assumed distance and interstellar extinction. For PSR J1846+0919, we found no object sufficiently close to the expected position to claim a possible association, whereas for PSR J2043+2740 we confirm our previous findings that the object nearest to the pulsar position is an unrelated field star. We used our brightness limits (g' ≈ 27), the first obtained with a large-aperture telescope for both PSR J1846+0919 and PSR J2055+2539, to constrain the optical emission properties of these pulsars and investigate the presence of spectral turnovers at low energies in their multiwavelength spectra.
    Original languageEnglish
    Pages (from-to)332-341
    JournalMonthly Notices of the Royal Astronomical Society
    Volume478
    Issue number1
    DOIs
    Publication statusPublished - 21 Jul 2018

    Keywords

    • PSR J1907+0602
    • PSR J2043+2740
    • PSR J2055+2539
    • Pulsars: Individual: PSR J1846+0919
    • Stars: Neutron

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