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The quiescent X-ray emission of three transient X-ray pulsars

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arxiv astro-ph/0207422 v1 pith:PGT6XGC5 submitted 2002-07-19 astro-ph

The quiescent X-ray emission of three transient X-ray pulsars

classification astro-ph
keywords x-rayemissionquiescentthreetransientsaccretiondifferentneutron
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We report on BeppoSAX and Chandra observations of three Hard X-Ray Transients in quiescence containing fast spinning (P<5 s) neutron stars: A 0538-66, 4U 0115+63 and V 0332+53. These observations allowed us to study these transients at the faintest flux levels thus far. Spectra are remarkably different from the ones obtained at luminosities a factor >10 higher, testifying that the quiescent emission mechanism is different. Pulsations were not detected in any of the sources, indicating that accretion of matter down to the neutron star surface has ceased. We conclude that the quiescent emission of the three X-ray transients likely originates from accretion onto the magnetospheric boundary in the propeller regime and/or from deep crustal heating resulting from pycnonuclear reactions during the outbursts.

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  1. Magnetospheric flows in X-ray pulsars II: Heating, cooling and ionization degree at sub-critical accretion

    astro-ph.HE 2026-07 conditional novelty 6.0

    Sub-critical magnetospheric accretion flows in X-ray pulsars cool to tens of eV near the surface and become partially ionized, contrary to the standard fully-ionized assumption.