SAX J1808.4−3658

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SAX J1808.4−3658
Observation data
ICRS
)
Constellation Sagittarius
Right ascension 17h 45m 39.73s[1]
Declination −29° 00′ 29.7″[1]
Apparent magnitude (V) 16.51
Spectral typeNeutron star
V4580
Sgr, PSR J1808−3658, SWIFT J1808.5−3655, INTREF 881, XTE J1808−369
Database references
SIMBADdata

The first accreting millisecond pulsar discovered in 1998 by the Italian-Dutch

low-mass X-ray binaries
.

A red band light curve for V4580 Sagittarii, adapted from Elebert et al. (2009)[3]

These accreting millisecond X-ray pulsars are thought to be the evolutionary progenitors of recycled radio millisecond pulsars. A total of thirteen accreting millisecond X-ray pulsars have been discovered as of January 2011. Three of them are Intermittent millisecond X-ray pulsars (HETE J1900.1-2455, Aql X-1 and SAX J1748.9-2021), i.e. they emit pulsations sporadically during the outburst.

On 21 August 2019 (UTC; 20 August in the US), Neutron Star Interior Composition Explorer (NICER) spotted the brightest X-ray burst so far observed.[4] It came from SAX J1808.4−3658.

References

  1. ^ a b "SAX J1808.4-3658". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 15 January 2017.
  2. S2CID 4428048
    .
  3. doi:10.1111/j.1365-2966.2009.14562.x
    .
  4. ^ NICER Telescope Spots Brightest X-Ray Burst Ever Observed


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