V. Komarova | Searcharxiv

arXiv2006

Optical spectroscopy of the radio pulsar PSR B0656+14

We have obtained the spectrum of a middle-aged PSR B0656+14 in the 4300-9000 AA range with the ESO/VLT/FORS2. Preliminary results show that at 4600-7000 AA the spectrum is almost featureless and flat with a spectral index $α_nu ~ -0.2 that undergoes a change to a positive value at longer wavelengths. Combining with available multiwavelength data suggests two wide, red and blue, flux depressions whose frequency ratio is about 2 and which could be the 1st and 2nd harmonics of electron/positron cyclotron absorption formed at magnetic fields ~10^8G in upper magnetosphere of the pulsar.

astro-ph↗

arXiv2005

Radiation efficiencies of the pulsars detected in the optical range

Using available multiwavelength data for the pulsars of different ages detected in the optical range, we analyze the efficiencies of the conversion of the pulsar spindown power \dot{E} into the observed non-thermal luminosity L in different spectral domains. We find that these pulsars show significantly non-monotonic dependencies of the optical and X-ray efficiencies (η= L/\dot{E}) versus pulsar age with a pronounced minimum at the beginning of the middle-age epoch and comparably higher efficiencies of younger and older pulsars. In addition, we find a strong correlation between the optical and 2--10 keV X-ray luminosities of these pulsars that implies the same origin of their nonthermal emission in both spectral domains.

astro-ph↗