Optical Studies of PSR J0633+1746 and PSR B0656+14 with Subaru

Details Optical Studies of PSR J0633+1746 and PSR B0656+14 with Subaru Optical Studies of PSR J0633+1746 and PSR B0656+14 with Subaru

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003pasb.conf...77k&link_type=abstract

"Pulsars, AXPs and SGRs observed with BeppoSAX and Other Observatories, Proceedings of the International Workshop held in Marsal

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Scientific paper

We present the results of the broadband photometry of two nearby middle-aged pulsars PSR J0633+1746 (Geminga) and PSR B0656+14 based on observations with the Subaru telescope. The Rc-magnitude of Geminga (25.53+/-0.11) is consistent with the results of other studies of its optical emission. The Ic magnitude 25.1+/-0.14, derived reliably for the first time, is more than a magnitude brighter than the upper limit given by Mignani et al. (1998). The comparison of the broadband spectra of this middle-aged isolated neutron star with the results of its observations in the X-rays and extremal ultraviolet suggests non-thermal origin of the Geminga emission at least at long wavelengths of the visible range. Perfect seeing during observations allowed to avoid contamination of the PSR B0656+14 optical counterpart by nearby extended object and to estimate accurately the counterpart magnitudes, which are found to be B=25.27+/-0.07, Rc = 24.65+/-0.08 and Ic = 24.52+/-0.13. The spectral flux of the pulsar decreases with increasing frequency in the near-IR range and increases with frequency in the near-UV range. The nonmonotonous broadband spectra of the optical emission of both Geminga and PSR B0656+14 are likely similar to each other but differ significantly from a flat and featureless spectrum of the young Crab pulsar, which is well described by a single power law with a spectral index alphanu ~0.2 in a wide range from IR to UV. This may reveal a spectral evolution of the optical emission with pulsar age.

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