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VLT observations of Fermi pulsars

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arxiv 1110.5273 v1 pith:U4QBI63M submitted 2011-10-24 astro-ph.HE

VLT observations of Fermi pulsars

R. P. Mignani (UCL-MSSL , Institute of Astronomy , University of Zielona Gora) , A. Shearer (NUI , Galway) , A. de Luca (IUSS , IASF-INAF , INFN)
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P. Moran S. Collins (NUI M. Marelli (IASF-INAF University of Insubria)
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keywords pulsarsfermiopticalobservationsrespectivelyspin-downbeencandidates
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Many energetic gamma-ray pulsars discovered by Fermi are promising candidates for optical follow-ups. We present the results of the first deep optical observations of the two Vela-like Fermi pulsars PSR J1357-6429 and PSR J1048-5832 performed with the VLT. However, they have not been detected down to V~27 and V~27.6, respectively (3 sigma). These upper limits suggest an efficiency in converting spin-down power into optical luminosity < 7x10d-7 and <6x10d-6, respectively, lower than the Crab pulsar and, possibly, more compatible with the spin-down age of these two pulsars.

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