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of the
Universities Space Research Association (USRA) at NASA's Marshall Space Flight Center decided to test the hypothesis that soft gamma repeaters were magnetars. According to the hypothesis, the bursts would cause the object to slow down its rotation. In 1998, she made careful comparisons of the
288:
of −66°. The date of discovery sometimes appears in a format such as 1979/1986 to refer to the year the object was discovered, in addition to the year soft gamma repeaters were recognized as a separate class of objects rather than "normal" gamma-ray bursts.
117:, which are usually ionized by the Sun's radiation by day and recombine to neutral atoms by night, were ionized at nighttime at levels not much lower than the normal daytime level. The Rossi X-Ray Timing Explorer (
128:, received its strongest signal from this burst at this time, even though it was directed at a different part of the sky, and should normally have been shielded from the radiation.
113:
observed on August 27, 1998. Despite the large distance to this SGR, estimated at 20,000 light years, the burst had large effects on the Earth's atmosphere. The atoms in the
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94:. The period had increased by 0.008 seconds since 1993, and she calculated that this would be explained by a magnetar with a
525:
106:). This was enough to convince the international astronomical community that soft gamma repeaters are indeed magnetars.
67:
saw the burst at slightly different times, its direction could be determined, and it was shown to originate from near a
173:
The most powerful soft gamma repeater burst yet recorded was observed coming from this object on
December 27, 2004.
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were less energetic in the soft gamma-ray and hard X-ray range, and repeated bursts came from the same region.
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Zhang, Bing; Xu, R.X.; Qiao, G.J. (2000). "Nature and
Nurture: a Model for Soft Gamma-Ray Repeaters".
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Astronomical object which emits bursts of gamma or x-rays at irregular intervals
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On the persistent X-ray emission from the soft gamma-ray repeaters. Usov. 1996
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Rotates once every 2.07 seconds, holds the record for the fastest-spinning
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Over time it became clear that this was not a normal gamma-ray burst. The
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The numbers give the position in the sky, for example, SGR 0525-66 has a
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inside the Milky Way, and the first ever to be linked to a known source.
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Scientists note 20th anniversary of March 5, 1979 gamma-ray burst event
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510:"'Magnetars', Soft Gamma Repeaters & Very Strong Magnetic Fields"
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372:
Magnetars', Soft Gamma
Repeaters & Very Strong Magnetic Fields
63:
was noted. As a number of receivers at different locations in the
39:
at irregular intervals. It is conjectured that they are a type of
712:
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Timeline of white dwarfs, neutron stars, and supernovae
109:
An unusually spectacular soft gamma repeater burst was
405:""Magnetar" discovery solves 19-year-old mystery"
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568:
427:
232:15,000 lyr away; X-ray outburst detected by
305:
575:
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449:"Star Emits Intense Celestial Fireworks"
186:20,000 lyr away; powerful, affected the
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512:. University of Texas. Archived from
270:30,000 lyr away; First ever detected
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467:"Giant eruption reveals 'dead' star"
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136:Known soft gamma repeaters include:
352:
249:A soft gamma repeater orbiting the
90:periodicity of soft gamma repeater
31:object which emits large bursts of
13:
507:
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14:
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790:Tolman–Oppenheimer–Volkoff limit
582:
973:Fermi Gamma-ray Space Telescope
435:"McGill SGR/AXP Online Catalog"
537:Heintzmann, H. (Mar 5, 1999).
441:
403:Dooling, Dave (May 20, 1998).
366:Duncan, Robert C. (May 1998).
299:
131:
1:
999:X-ray pulsar-based navigation
978:Compton Gamma Ray Observatory
522:"Cosmic Flasher Reveals All!"
376:University of Texas at Austin
292:
59:On March 5, 1979 a powerful
7:
968:Rossi X-ray Timing Explorer
811:Gamma-ray burst progenitors
539:"Happy birthday, Magnetars"
10:
1089:
765:Quasi-periodic oscillation
236:satellite 22 August 2008.
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991:
983:Chandra X-ray Observatory
958:
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308:The Astrophysical Journal
750:Neutron-star oscillation
639:Rotating radio transient
1004:Tempo software program
545:on February 27, 2012.
73:Large Magellanic Cloud
1014:The Magnificent Seven
471:European Space Agency
368:"The March 5th Event"
1063:Soft gamma repeaters
919:Thorne–Żytkow object
1073:Astronomical events
870:Neutron star merger
730:Chandrasekhar limit
697:Hulse–Taylor pulsar
624:Soft gamma repeater
455:. 10 February 2009.
330:2000ApJ...545L.127Z
87:Chryssa Kouveliotou
43:or, alternatively,
21:soft gamma repeater
914:Pulsar wind nebula
892:Stellar black hole
508:Duncan, Robert C.
188:Earth's atmosphere
1050:
1049:
843:Supernova remnant
633:Ultra-long period
532:on July 20, 2011.
415:on March 11, 2009
278:
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98:strength of 8×10
69:supernova remnant
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816:Asteroseismology
718:Fast radio burst
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541:. Archived from
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528:. Archived from
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516:on May 17, 2013.
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411:. Archived from
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321:astro-ph/0010225
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272:fast radio burst
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735:Gamma-ray burst
725:Bondi accretion
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629:Anomalous X-ray
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490:Further reading
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61:gamma-ray burst
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502:External links
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473:. 16 June 2009
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338:10.1086/317889
314:(2): 127–129.
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255:Sagittarius A*
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242:SGR J1745−2900
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208:SGR J1550−5418
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96:magnetic-field
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961:investigation
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909:Pulsar planet
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897:Related links
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885:Related links
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848:Related links
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670:X-ray burster
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263:SGR 1935+2154
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225:SGR 0501+4516
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51:around them.
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45:neutron stars
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30:
26:
22:
821:Compact star
795:Urca process
785:Timing noise
770:Relativistic
665:X-ray binary
660:X-ray pulsar
623:
584:Neutron star
546:
543:the original
530:the original
514:the original
475:. Retrieved
461:
443:
429:
417:. Retrieved
413:the original
379:. Retrieved
371:
311:
307:
301:
279:
135:
108:
84:
77:
65:Solar System
58:
47:with fossil
29:astronomical
24:
20:
18:
880:White dwarf
865:Microquasar
831:Exotic star
760:Pulsar kick
682:Millisecond
598:Radio-quiet
477:28 December
286:declination
196:SGR 1627−41
179:SGR 1900+14
166:SGR 1806−20
154:SGR 0525−66
132:List of SGR
111:SGR 1900+14
92:SGR 1806-20
85:Astronomer
1068:Star types
1057:Categories
1009:Astropulse
924:QCD matter
904:Radio star
875:Quark-nova
826:Quark star
775:Rp-process
706:Properties
293:References
251:black hole
115:ionosphere
33:gamma-rays
959:Satellite
933:Discovery
855:Hypernova
838:Supernova
780:Starquake
453:Space.com
183:1979/1986
170:1979/1986
145:Discovery
126:satellite
1032:Category
860:Kilonova
687:Be/X-ray
619:Magnetar
419:March 2,
381:March 2,
346:14745312
217:magnetar
41:magnetar
27:) is an
1042:Commons
804:Related
755:Optical
713:Blitzar
692:Spin-up
326:Bibcode
80:photons
71:in the
55:History
740:Glitch
655:Binary
603:Pulsar
344:
148:Notes
142:Object
121:), an
102:(8×10
100:teslas
37:X-rays
992:Other
940:LGM-1
591:Types
342:S2CID
316:arXiv
234:Swift
123:X-ray
104:gauss
49:disks
675:List
526:NRAO
479:2009
421:2009
409:NASA
383:2009
267:2014
246:2013
229:2008
212:2008
200:1998
158:1979
119:RXTE
35:and
334:doi
312:545
253:in
25:SGR
1059::
524:.
469:.
451:.
407:.
391:^
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370:.
354:^
340:.
332:.
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257:.
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75:.
19:A
576:e
569:t
562:v
481:.
437:.
423:.
385:.
348:.
336::
328::
318::
23:(
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.