A XMM-Newton observation during the 2000 outburst of SAX J1808.4-3658
arXiv:astro-ph/0207102 · doi:10.1086/373984
Abstract
I present a XMM-Newton observation of the accretion driven millisecond X-ray pulsar SAX J1808.4-3658 during its 2000 outburst. The source was conclusively detected, albeit at a level of only ~2 x 10^{32} erg/s. The source spectrum could be fitted with a power-law model (with a photon index of ~2.2), a neutron star atmosphere model (with a temperature of ~0.2 keV), or with a combination of a thermal (either a black-body or an atmosphere model) and a power-law component. During a XMM-Newton observation taken approximately one year later, the source was in quiescence and its luminosity was a factor of ~4 lower. It is possible that the source spectrum during the 2000 outburst was softer than its quiescent 2001 spectrum, however, the statistics of the data do not allow to make a firm conclusion. The results obtained are discussed in the context of the 2000 outburst of SAX J1808.4-3658 and the quiescent properties of the source.
Accepted for publication in ApJ, 15 January 2003
References in corpus (4)
- Discovery of a Second Millisecond Accreting Pulsar: XTE J1751-305
- An XMM-Newton study of the 401 Hz accreting pulsar SAX J1808.4-3658 in quiescence
- Chandra Study of a Complete Sample of Millisecond Pulsars in 47Tuc and NGC6397
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- Accreting Millisecond X-Ray Pulsars
- Indirect evidence for an active radio pulsar in the quiescent state of the transient ms pulsar SAX J1808.4-3658
- 1 Hz flaring in SAX J1808.4--3658: flow instabilities near the propeller stage
- Accelerated Orbital Expansion And Secular Spin Down of the Accreting Millisecond Pulsar SAX J1808.4-3658
- The Reflares and Outburst Evolution in the Accreting Millisecond Pulsar SAX J1808.4-3658: a Disk Truncated Near Co-rotation?
- SAX J1808.4-3658: high resolution spectroscopy and decrease of pulsed fraction at low energies
- Indications of non-conservative mass-transfer in AMXPs
- An observational review of accretion-driven millisecond X-ray pulsars