The `soft' excess in low-luminosity X-ray pulsars

Details The `soft' excess in low-luminosity X-ray pulsars The `soft' excess in low-luminosity X-ray pulsars

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1248..173l&link_type=abstract

X-RAY ASTRONOMY 2009; PRESENT STATUS, MULTI-WAVELENGTH APPROACH AND FUTURE PERSPECTIVES: Proceedings of the International Confer

Astronomy and Astrophysics

Astronomy

X-Ray Binary Stars, X-Ray Pulsars, Neutron Stars, Brightness, X-Ray Binaries, Pulsars, Neutron Stars, Luminosities, Magnitudes, Effective Temperatures, Colors, And Spectral Classification

Scientific paper

We report on the XMM-Newton observations of three persistent, long-period and low-luminosity Be/NS binary pulsars. In all of them the spectral analysis show a clear blackbody excess over the main power-law component, which, unlike the other more luminous pulsars, is characterized by a high temperature (kTBB>1 keV) and a small radius (RBB<500 m). The derived blackbody radius is consistent with the expected size of the neutron-star polar cap, suggesting that the soft excess might originate on the NS surface.

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