Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.266..635m&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 266, p. 635
Astronomy and Astrophysics
Astronomy
22
Rosat Mission, Pulsars, X Ray Stars, X Ray Astronomy, Spectrum Analysis, Thermal Radiation, Nonthermal Radiation, Nebulae, X Ray Spectra
Scientific paper
We report on observations of the radio pulsar PSR 0950 + 08 obtained using the Position Sensitive Proportional Counter and Wide Field Camera on board ROSAT. The background-corrected count rate is determined to be 0.0069 +/- 0.0012 count/s in the 0.08-2.4 keV energy range. The derived spectrum could be fitted to both blackbody and power-law models modified by interstellar absorption. The best-fitting surface temperature of 2.6 x 10 exp 6 K and the age of PSR 0950 + 08 imply that some form of heating process is occurring if the emission is thermal. The small implied size of the emission region points towards some form of polar-cap heating, although of the models available only the 'slot-gap' model proposed by Arons can perhaps account for the observed luminosity. The most likely explanation for the emission is that PSR 0950 + 08 is surrounded by a synchrotron nebula, which is unresolved and has a spectral index of about 1. For either model the X-ray luminosity (0.08-2.4 keV) is about 10 exp 29 erg/s.
Manning Raymund A.
Willmore A. P.
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