SAX J1808.4−3658: Difference between revisions
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These accreting millisecond [[X-ray pulsar]]s are thought to be the evolutionary progenitors of recycled radio [[millisecond pulsar]]s. 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. |
These accreting millisecond [[X-ray pulsar]]s are thought to be the evolutionary progenitors of recycled radio [[millisecond pulsar]]s. 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. |
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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.<ref>[https://www.space.com/nicer-telescope-brightest-x-ray-burst.html NICER Telescope Spots Brightest X-Ray Burst Ever Observed]</ref> It came from SAX J1808.4−3658. |
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==References== |
==References== |
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Revision as of 22:10, 16 November 2019
 | This article needs additional citations for verification. (January 2017) |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 17h 45m 39.73s[1] |
| Declination | −29° 00′ 29.7″[1] |
| Apparent magnitude (V) | 16.51 |
| Spectral type | Neutron star |
| Other designations | |
V4580 Sgr, PSR J1808−3658, SWIFT J1808.5−3655, INTREF 881, XTE J1808−369 | |
| Database references | |
| SIMBAD | data |
A transient X-ray source first discovered in 1996 by the Italian-Dutch BeppoSAX satellite, SAX J1808.4−3658 revealed X-ray pulsations at the 401 Hz neutron star spin frequency when it was observed during a subsequent outburst in 1998 by NASA's RXTE satellite.[2] The neutron star is orbited by a brown dwarf binary companion with a likely mass of 0.05 solar masses, every 2.01 hours. X-ray burst oscillations and quasi-periodic oscillations in addition to coherent X-ray pulsations have been seen from SAX J1808.4-3658, making it a Rosetta stone for interpretation of the timing behavior of low-mass X-ray binaries.
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.[3] It came from SAX J1808.4−3658.
References
- ^ a b "SAX J1808.4-3658". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 15 January 2017.
- ^ Wijnands, Rudy; van der Klis, Michiel (1998). "A millisecond pulsar in an X-ray binary system". Nature. 394 (6691): 344–346. Bibcode:1998Natur.394..344W. doi:10.1038/28557.
- ^ NICER Telescope Spots Brightest X-Ray Burst Ever Observed
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