Unpulsed Optical Emission Studies: Geminga, PSR B0656+14 & the Crab

Details Unpulsed Optical Emission Studies: Geminga, PSR B0656+14 & the Crab Unpulsed Optical Emission Studies: Geminga, PSR B0656+14 & the Crab

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe.240g&link_type=abstract

Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:

Astronomy and Astrophysics

Astrophysics

Scientific paper

High speed optical photometry allows differentiation of the pulsed and unpulsed components of emission from isolated rotation-powered neutron stars. The predominately thermal unpulsed flux can critically constrain (Tsurface, R/d) space of the blackbody continuum. For Geminga, using upper limits to this flux in B combined with published model-fits we conclude that Rinfty <= 9.5 km (d ~160 pc). Similarly, we suggest a distance some 4-5 times closer than the DM distance of 760 pc for PSR B0656+14. For the Crab pulsar, there is evidence of significant unpulsed emission consistent spectrally with a magnetospheric origin, in contrast to expected unpulsed gamma-ray emission beyond the light cylinder. Such results demand further observations, with important future implications for equation of state and emission models.

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