Magnetar twists: Fermi/Gamma-Ray Burst Monitor detection of SGR J1550-5418

Y. Kaneko; E. Gogus; C. Kouveliotou; J. Granot; E. Ramirez-Ruiz; A.J. van der Horst; A.L. Watts; M.H. Finger; N. Gehrels; A. Pe'er; M. van der Klis; A. von Kienlin; S. Wachter; C.A. Wilson-Hodge; P.M. Woods

doi:10.1088/0004-637X/710/2/1335

Magnetar twists: Fermi/Gamma-Ray Burst Monitor detection of SGR J1550-5418

Y. Kaneko, E. Gogus, C. Kouveliotou, J. Granot, E. Ramirez-Ruiz, A.J. van der Horst, A.L. Watts, M.H. Finger, N. Gehrels, A. Pe'er, M. van der Klis, A. von Kienlin, S. Wachter, C.A. Wilson-Hodge, P.M. Woods

Centre for Astrophysics Research (CAR)

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Abstract

SGR J1550-5418 (previously known as AXP 1E 1547.0-5408 or PSR J1550-5418) went into three active bursting episodes in 2008 October and in 2009 January and March, emitting hundreds of typical soft gamma repeater bursts in soft gamma rays. The second episode was especially intense, and our untriggered burst search on Fermi/Gamma-ray Burst Monitor (GBM) data (8-1000 keV) revealed ~450 bursts emitted over 24 hr during the peak of this activity. Using the GBM data, we identified a ~150 s long enhanced persistent emission during 2009 January 22 that exhibited intriguing timing and spectral properties: (1) clear pulsations up to ~110 keV at the spin period of the neutron star (P ~ 2.07 s, the fastest of all magnetars); (2) an additional (to a power-law) blackbody component required for the enhanced emission spectra with kT ~ 17 keV; and (3) pulsed fraction that is strongly energy dependent and highest in the 50-74 keV energy band. A total isotropic-equivalent energy emitted during this enhanced emission is estimated to be 2.9 × 1040(D/5 kpc)2 erg. The estimated area of the blackbody emitting region of 0.046(D/5 kpc)2 km2 (roughly a few ×10–5 of the neutron star area) is the smallest "hot spot" ever measured for a magnetar and most likely corresponds to the size of magnetically confined plasma near the neutron star surface.

Original language	English
Pages (from-to)	1335-1342
Journal	The Astrophysical Journal
Volume	710
Issue number	2
DOIs	https://doi.org/10.1088/0004-637X/710/2/1335
Publication status	Published - 2010

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Kaneko, Y., Gogus, E., Kouveliotou, C., Granot, J., Ramirez-Ruiz, E., van der Horst, A. J., Watts, A. L., Finger, M. H., Gehrels, N., Pe'er, A., van der Klis, M., von Kienlin, A., Wachter, S., Wilson-Hodge, C. A., & Woods, P. M. (2010). Magnetar twists: Fermi/Gamma-Ray Burst Monitor detection of SGR J1550-5418. The Astrophysical Journal, 710(2), 1335-1342. https://doi.org/10.1088/0004-637X/710/2/1335

@article{fff48d6f3b664072acdb422bfe9f188f,

title = "Magnetar twists: Fermi/Gamma-Ray Burst Monitor detection of SGR J1550-5418",

abstract = "SGR J1550-5418 (previously known as AXP 1E 1547.0-5408 or PSR J1550-5418) went into three active bursting episodes in 2008 October and in 2009 January and March, emitting hundreds of typical soft gamma repeater bursts in soft gamma rays. The second episode was especially intense, and our untriggered burst search on Fermi/Gamma-ray Burst Monitor (GBM) data (8-1000 keV) revealed ~450 bursts emitted over 24 hr during the peak of this activity. Using the GBM data, we identified a ~150 s long enhanced persistent emission during 2009 January 22 that exhibited intriguing timing and spectral properties: (1) clear pulsations up to ~110 keV at the spin period of the neutron star (P ~ 2.07 s, the fastest of all magnetars); (2) an additional (to a power-law) blackbody component required for the enhanced emission spectra with kT ~ 17 keV; and (3) pulsed fraction that is strongly energy dependent and highest in the 50-74 keV energy band. A total isotropic-equivalent energy emitted during this enhanced emission is estimated to be 2.9 × 1040(D/5 kpc)2 erg. The estimated area of the blackbody emitting region of 0.046(D/5 kpc)2 km2 (roughly a few ×10–5 of the neutron star area) is the smallest {"}hot spot{"} ever measured for a magnetar and most likely corresponds to the size of magnetically confined plasma near the neutron star surface.",

author = "Y. Kaneko and E. Gogus and C. Kouveliotou and J. Granot and E. Ramirez-Ruiz and {van der Horst}, A.J. and A.L. Watts and M.H. Finger and N. Gehrels and A. Pe'er and {van der Klis}, M. and {von Kienlin}, A. and S. Wachter and C.A. Wilson-Hodge and P.M. Woods",

note = "Original article can be found at: http://www.iop.org/EJ/journal/apj Copyright American Astronomical Society [Full text of this article is not available in the UHRA]",

year = "2010",

doi = "10.1088/0004-637X/710/2/1335",

language = "English",

volume = "710",

pages = "1335--1342",

journal = "The Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP Publishing Ltd.",

number = "2",

}

Kaneko, Y, Gogus, E, Kouveliotou, C, Granot, J, Ramirez-Ruiz, E, van der Horst, AJ, Watts, AL, Finger, MH, Gehrels, N, Pe'er, A, van der Klis, M, von Kienlin, A, Wachter, S, Wilson-Hodge, CA & Woods, PM 2010, 'Magnetar twists: Fermi/Gamma-Ray Burst Monitor detection of SGR J1550-5418', The Astrophysical Journal, vol. 710, no. 2, pp. 1335-1342. https://doi.org/10.1088/0004-637X/710/2/1335

TY - JOUR

T1 - Magnetar twists: Fermi/Gamma-Ray Burst Monitor detection of SGR J1550-5418

AU - Kaneko, Y.

AU - Gogus, E.

AU - Kouveliotou, C.

AU - Granot, J.

AU - Ramirez-Ruiz, E.

AU - van der Horst, A.J.

AU - Watts, A.L.

AU - Finger, M.H.

AU - Gehrels, N.

AU - Pe'er, A.

AU - van der Klis, M.

AU - von Kienlin, A.

AU - Wachter, S.

AU - Wilson-Hodge, C.A.

AU - Woods, P.M.

N1 - Original article can be found at: http://www.iop.org/EJ/journal/apj Copyright American Astronomical Society [Full text of this article is not available in the UHRA]

PY - 2010

Y1 - 2010

N2 - SGR J1550-5418 (previously known as AXP 1E 1547.0-5408 or PSR J1550-5418) went into three active bursting episodes in 2008 October and in 2009 January and March, emitting hundreds of typical soft gamma repeater bursts in soft gamma rays. The second episode was especially intense, and our untriggered burst search on Fermi/Gamma-ray Burst Monitor (GBM) data (8-1000 keV) revealed ~450 bursts emitted over 24 hr during the peak of this activity. Using the GBM data, we identified a ~150 s long enhanced persistent emission during 2009 January 22 that exhibited intriguing timing and spectral properties: (1) clear pulsations up to ~110 keV at the spin period of the neutron star (P ~ 2.07 s, the fastest of all magnetars); (2) an additional (to a power-law) blackbody component required for the enhanced emission spectra with kT ~ 17 keV; and (3) pulsed fraction that is strongly energy dependent and highest in the 50-74 keV energy band. A total isotropic-equivalent energy emitted during this enhanced emission is estimated to be 2.9 × 1040(D/5 kpc)2 erg. The estimated area of the blackbody emitting region of 0.046(D/5 kpc)2 km2 (roughly a few ×10–5 of the neutron star area) is the smallest "hot spot" ever measured for a magnetar and most likely corresponds to the size of magnetically confined plasma near the neutron star surface.

AB - SGR J1550-5418 (previously known as AXP 1E 1547.0-5408 or PSR J1550-5418) went into three active bursting episodes in 2008 October and in 2009 January and March, emitting hundreds of typical soft gamma repeater bursts in soft gamma rays. The second episode was especially intense, and our untriggered burst search on Fermi/Gamma-ray Burst Monitor (GBM) data (8-1000 keV) revealed ~450 bursts emitted over 24 hr during the peak of this activity. Using the GBM data, we identified a ~150 s long enhanced persistent emission during 2009 January 22 that exhibited intriguing timing and spectral properties: (1) clear pulsations up to ~110 keV at the spin period of the neutron star (P ~ 2.07 s, the fastest of all magnetars); (2) an additional (to a power-law) blackbody component required for the enhanced emission spectra with kT ~ 17 keV; and (3) pulsed fraction that is strongly energy dependent and highest in the 50-74 keV energy band. A total isotropic-equivalent energy emitted during this enhanced emission is estimated to be 2.9 × 1040(D/5 kpc)2 erg. The estimated area of the blackbody emitting region of 0.046(D/5 kpc)2 km2 (roughly a few ×10–5 of the neutron star area) is the smallest "hot spot" ever measured for a magnetar and most likely corresponds to the size of magnetically confined plasma near the neutron star surface.

U2 - 10.1088/0004-637X/710/2/1335

DO - 10.1088/0004-637X/710/2/1335

M3 - Article

SN - 0004-637X

VL - 710

SP - 1335

EP - 1342

JO - The Astrophysical Journal

JF - The Astrophysical Journal

IS - 2

ER -

Magnetar twists: Fermi/Gamma-Ray Burst Monitor detection of SGR J1550-5418

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