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SWIFT J1818.0−1607

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SWIFT J1818.0−1607
BERJAYA
Chandra X-ray Observatory image of Swift J1818.0–1607 (pink) composited with an infrared photograph of its location in the sky
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Sagittarius[1]
Right ascension 18h 18m 00.23s[2]
Declination −16° 07′ 53.0″[2]
Characteristics
Spectral type Magnetar
Astrometry
Distance4800–8100 pc[3]
Details
Rotation1.363489(3) s (X-ray)[3]: 4 
1.3635273(4) s (radio)[3]: 4 
Age500 years[4]
or 240[3] years
Other designations
SWIFT J1818−1607, PSR J1818−1607
Database references
SIMBADdata

SWIFT J1818.0−1607 is a young magnetar and soft gamma repeater, with an estimated age between 240 and 500 years. For context, other magnetars have a characteristic age of less than 200,000 years.[4] This means that this neutron star could be one of the youngest neutron stars and magnetars detected so far. It is located at a distance of 4800-8100 parsecs from Earth in the Constellation of Sagittarius.[5] It has a mass of about two solar masses packed into a region of space more than a trillion times smaller making it extremely dense.[6]Observations revealed that SWIFT J1828.0−1607 had a spin period of 1.36 seconds.[7]

SWIFT J1828.0−1607 has a very dynamic magnetosphere which is inferred from its variability in its shape and polarization properties. It may also provide a crucial link between High-magnetic field radio pulsars and magnetars.[8]

Discovery

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It was discovered by NASA's Neil Gehrels Swift Observatory when it exhibited an X-ray burst on 12 March 2020.[7][5] Further observations detected pulsed radio emissions making SWIFT J1828.0−1607 only the fifth radio-loud magnetar discovered.[8]

References

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  1. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
  2. 1 2 "SWIFT J1818.0-1607 -- Neutron Star". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 7 March 2023.
  3. 1 2 3 4 Esposito, P.; Rea, N.; Borghese, A.; Coti Zelati, F.; Viganò, D.; Israel, G. L.; et al. (June 2020). "A Very Young Radio-loud Magnetar". The Astrophysical Journal Letters. 896 (2): 8. arXiv:2004.04083. Bibcode:2020ApJ...896L..30E. doi:10.3847/2041-8213/ab9742. S2CID 215415773. L30.
  4. 1 2 Champion, David; Cognard, Ismael; Cruces, Marilyn; Desvignes, Gregory; Jankowski, Fabian; Karuppusamy, Ramesh; et al. (November 2020). "High-cadence observations and variable spin behaviour of magnetar Swift J1818.0-1607 after its outburst". Monthly Notices of the Royal Astronomical Society. 498 (4): 6044–6056. arXiv:2009.03568. Bibcode:2020MNRAS.498.6044C. doi:10.1093/mnras/staa2764.
  5. 1 2 Enoto, Teruaki; Sakamoto, Takanori; Younes, George; Hu, Chin-Ping; Ho, Wynn C. G.; Gendreau, Keith; et al. (13 March 2020). "NICER detection of 1.36 sec periodicity from a new magnetar, Swift J1818.0-1607". The Astronomer's Telegram. 13551 (13551): 1. Bibcode:2020ATel13551....1E. Retrieved 7 March 2023.
  6. ↑ "A Cosmic Baby Is Discovered, and It's Brilliant - NASA". 17 June 2020. Retrieved 1 July 2025.
  7. 1 2 Evans, P. A.; Gropp, J. D.; Kennea, J. A.; Klingler, N. J.; Laha, S.; Lien, A. Y.; et al. (12 March 2020). "Swift-BAT trigger 960986: Swift detection of a new SGR Swift J1818.0-1607". GRB Coordinates Network Circular. 27373 (27373). NASA: 1. Bibcode:2020GCN.27373....1E. Retrieved 7 March 2023.
  8. 1 2 Fisher, R; Butterworth, E M; Rajwade, K M; Stappers, B W; Desvignes, G; Karuppusamy, R; Kramer, M; Liu, K; Lyne, A G; Mickaliger, M B; Shaw, B; Weltevrede, P (21 February 2024). "Radio pulse profile evolution of magnetar Swift J1818.0−1607". Monthly Notices of the Royal Astronomical Society. 528 (2): 3833–3843. doi:10.1093/mnras/stae271. ISSN 0035-8711.
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