SGR J1745−2900 explained

SGR J1745−2900, or PSR J1745−2900, is the first-discovered magnetar orbiting the black hole Sagittarius A*, in the center of the Milky Way.^{[1] [2]} The magnetar was discovered in 2013 using the Effelsberg 100-m Radio Telescope, the Nancay Decimetric Radio Telescope, and the Jodrell Bank Lovell Telescope. The magnetar has a period of 3.76 s and a magnetic flux density of ~ 10¹⁰ T (10¹⁴ G). The magnetar is 0.33 ly from the central black hole.

The object offers an unparalleled tool for probing the ionized interstellar medium (ISM) toward the Galactic Center (GC),^[3] and a possible way to test quantum gravity effects.^[4]

Notes and References

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2. Mori. Kaya. Gotthelf. Eric V.. Zhang. Shuo. An. Hongjun. Baganoff. Frederick K.. Barrière. Nicolas M.. Beloborodov. Andrei M.. Boggs. Steven E.. Christensen. Finn E.. Craig. William W.. Dufour. Francois. Grefenstette. Brian W.. Hailey. Charles J.. Harrison. Fiona A.. Hong. Jaesub. Kaspi. Victoria M.. Kennea. Jamie A.. Madsen. Kristin K.. Markwardt. Craig B.. Nynka. Melania. Stern. Daniel. Tomsick. John A.. Zhang. William W.. 1. DISCOVERY OF A 3.76 s TRANSIENT MAGNETAR NEAR SAGITTARIUS A*. The Astrophysical Journal. 20 June 2013. 770. 2. L23. 10.1088/2041-8205/770/2/L23. 1305.1945 . 2013ApJ...770L..23M . 6803966 .
3. Eatough. R. P.. Falcke. H.. Karuppusamy. R.. Lee. K. J.. Champion. D. J.. Keane. E. F.. Desvignes. G.. Schnitzeler. D. H. F. M.. Spitler. L. G.. Kramer. M.. Klein. B.. Bassa. C.. Bower. G. C.. Brunthaler. A.. Cognard. I.. Deller. A. T.. Demorest. P. B.. Freire. P. C. C.. Kraus. A.. Lyne. A. G.. Noutsos. A.. Stappers. B.. Wex. N.. 1. A strong magnetic field around the supermassive black hole at the centre of the Galaxy. Nature. 14 August 2013. 501. 7467. 391–394. 10.1038/nature12499. 1308.3147 . 2013Natur.501..391E. 23945588. 4448706 .
4. Pen. U.-L.. Broderick. A. E.. Possible astrophysical observables of quantum gravity effects near black holes. Monthly Notices of the Royal Astronomical Society. 29 October 2014. 445. 4. 3370–3373. 10.1093/mnras/stu1919. 1312.4017 . 2014MNRAS.445.3370P .