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|a Mori, Kaya
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|a MIT Kavli Institute for Astrophysics and Space Research
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|a Baganoff, Frederick K.
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|a Gotthelf, Eric V.
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|a Zhang, Shuo
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|a An, Hongjun
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|a Barriere, Nicolas M.
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|a Beloborodov, Andrei M.
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|a Boggs, Steven E.
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|a Christensen, Finn E.
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|a Craig, William W.
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|a Dufour, Francois
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|a Grefenstette, Brian W.
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|a Hailey, Charles J.
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|a Harrison, Fiona A.
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|a Hong, Jaesub
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|a Kaspi, Victoria
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|a Kennea, Jamie A.
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|a Madsen, Kristin K.
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|a Markwardt, Craig B.
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|a Nynka, Melania
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|a Stern, Daniel
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|a Tomsick, John A.
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|a Zhang, William W.
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|a Baganoff, Frederick K
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|a NuSTAR DISCOVERY OF A 3.76 s TRANSIENT MAGNETAR NEAR SAGITTARIUS A*
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|b IOP Publishing,
|c 2015-02-03T19:58:46Z.
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|z Get fulltext
|u http://hdl.handle.net/1721.1/93747
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|a We report the discovery of 3.76 s pulsations from a new burst source near Sgr A* observed by the NuSTAR observatory. The strong signal from SGR J1745-29 presents a complex pulse profile modulated with pulsed fraction 27% ± 3% in the 3-10 keV band. Two observations spaced nine days apart yield a spin-down rate of [dot over P] = (6.5 ± 1.4) × 10[superscipt -12]. This implies a magnetic field B = 1.6 × 10[superscript 14] G, spin-down power [dot over E] = 5 × 10[superscript 33] erg s[superscript -1], and characteristic age P/2 [dot over P] = 9 × 10[superscript 3] yr for the rotating dipole model. However, the current [dot over P] may be erratic, especially during outburst. The flux and modulation remained steady during the observations and the 3-79 keV spectrum is well fitted by a combined blackbody plus power-law model with temperature kT [subscript BB] = 0.96 ± 0.02 keV and photon index Γ = 1.5 ± 0.4. The neutral hydrogen column density (N [subscript H] ~ 1.4 × 10[superscript 23] cm[superscript -2]) measured by NuSTAR and Swift suggests that SGR J1745-29 is located at or near the Galactic center. The lack of an X-ray counterpart in the published Chandra survey catalog sets a quiescent 2-8 keV luminosity limit of L[subscript x] [< over ~] 10[superscript 32] erg s[superscript -1]. The bursting, timing, and spectral properties indicate a transient magnetar undergoing an outburst with 2-79 keV luminosity up to 3.5 × 1035 erg s-1 for a distance of 8 kpc. SGR J1745-29 joins a growing subclass of transient magnetars, indicating that many magnetars in quiescence remain undetected in the X-ray band or have been detected as high-B radio pulsars. The peculiar location of SGR J1745-29 has important implications for the formation and dynamics of neutron stars in the Galactic center region.
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|a United States. National Aeronautics and Space Administration (Contract NNG08FD60C)
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|a en_US
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|a Article
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|t The Astrophysical Journal. Letters
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