Swift J1818.0–1607

Swift J1818.0–1607

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
Right ascension 18h 18m 00.23s[1]
Declination –16° 07′ 53.0″[1]
Characteristics
Spectral type Magnetar
Astrometry
Distance4800–8100 pc[2]
Details
Rotation1.363489(3) s (X-ray)[2]: 4 
1.3635273(4) s (radio)[2]: 4 
Age500 years[3]
or 240[2] 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.[3] 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.[4] 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.[5]Observations revealed that Swift J1828.0-1607 had a spin period of 1.36 seconds.[6]

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.[7]

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.[6][4] Further observations detected pulsed radio emissions making Swift J1828.0-1607 only the fifth radio-loud magnetar discovered.[7]

References

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  1. ^ a b "SWIFT J1818.0-1607 -- Neutron Star". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 7 March 2023.
  2. ^ a b c d 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.
  3. ^ a b 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.
  4. ^ a b 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.
  5. ^ "A Cosmic Baby Is Discovered, and It's Brilliant - NASA". 17 June 2020. Retrieved 1 July 2025.
  6. ^ a b 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.
  7. ^ a b 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.{{cite journal}}: CS1 maint: unflagged free DOI (link)
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