Astronomy:SWIFT J1818.0−1607

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Short description: Young magnetar in the Sagittarius Constellation
SWIFT J1818.0−1607
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Chandra X-ray Observatory image of Swift J1818.0–1607 (pink) composited with an infrared photograph of its location in the sky
Observation data
Equinox J2000.0]] (ICRS)
Constellation Sagittarius
Right ascension  18h 18m 00.23s[1]
Declination −16° 07′ 53.0″[1]
Characteristics
Spectral type Magnetar
Astrometry
Distance4800–8100 pc
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

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

  1. ↑ 1.0 1.1 "SWIFT J1818.0-1607 -- Neutron Star". SIMBAD. Centre de données astronomiques de Strasbourg. https://simbad.u-strasbg.fr/simbad/sim-id?Ident=Swift+J1818.0-1607. Retrieved 7 Mar 2023. 
  2. ↑ 2.0 2.1 2.2 Esposito, P.Expression error: Unrecognized word "etal". (June 2020). "A Very Young Radio-loud Magnetar". The Astrophysical Journal Letters 896 (2): 8. doi:10.3847/2041-8213/ab9742. L30. Bibcode: 2020ApJ...896L..30E. 
  3. ↑ 3.0 3.1 Champion, DavidExpression error: Unrecognized word "etal". (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. doi:10.1093/mnras/staa2764. Bibcode: 2020MNRAS.498.6044C. 
  4. ↑ 4.0 4.1 Enoto, TeruakiExpression error: Unrecognized word "etal". (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. https://www.astronomerstelegram.org/?read=13551. Retrieved 7 March 2023. 
  5. ↑ "A Cosmic Baby Is Discovered, and It's Brilliant - NASA" (in en-US). 2020-06-17. https://www.nasa.gov/centers-and-facilities/jpl/a-cosmic-baby-is-discovered-and-its-brilliant/. 
  6. ↑ 6.0 6.1 Evans, P. A.Expression error: Unrecognized word "etal". (12 March 2020). "Swift-BAT trigger 960986: Swift detection of a new SGR Swift J1818.0-1607". GRB Coordinates Network Circular (NASA) 27373 (27373): 1. Bibcode: 2020GCN.27373....1E. https://gcn.gsfc.nasa.gov/gcn3/27373.gcn3. Retrieved 7 March 2023. 
  7. ↑ 7.0 7.1 Fisher, R; Butterworth, E M; Rajwade, K M; Stappers, B W; Desvignes, G; Karuppusamy, R; Kramer, M; Liu, K et al. (2024-02-21). "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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