R. P. Mignani, A. Shearer, A. de Luca, P. Moran, S. Collins, M. Marelli
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.
View original:
http://arxiv.org/abs/1110.5273
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