1996/01/31 by Dany Page, Yu. A. Shibanov, V. E. Zavlin
Physics and Astronomy · #astro-ph
published as `Roentgenstrahlung from the Universe', MPE Report 263 (1996) 173 · 2 pages Latex with 1 figure and 1 heading in postscript. Style file: xray-wuerzburg-95.sty
arxiv created 1996/01/31 · arxiv updated 2009/12/01
We use models of magnetized hydrogen atmospheres to fit the soft X-ray thermal spectrum of the Vela pulsar obtained by ROSAT. The distance and hydrogen column density required by our fits are in good agreement with other independents estimates and can be considered as an argument for the presence of hydrogen at the surface of this pulsar. The low temperature obtained, T = 7.85 +/- 0.25 105 K, is below the predictions of the `standard' model of neutron star cooling and strengthens previous claims for the necessity of the occurrence of fast neutrino cooling in this neutron star.