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25 April 2024

» arxiv » 1305.1945

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NuSTAR discovery of a 3.76-second transient magnetar near Sagittarius A*
Kaya Mori ; Eric V. Gotthelf ; Shuo Zhang ; Hongjun An ; Frederick K. Baganoff ; Nicolas M. Barriere ; Andrei Beloborodov ; Steven E. Boggs ; Finn E. Christensen ; William W. Craig ; Francois Dufour ; Brian W. Grefenstette ; Charles J. Hailey ; Fiona Anne Harrison ; Jaesub Hong ; Victoria M. Kaspi ; Jamie A. Kennea ; Kristin K. Madsen ; Craig B. Markwardt ; Melania Nynka ; Daniel Stern ; John Tomsick ; William Zhang ;
Date:	8 May 2013
Abstract:	We report the discovery of 3.76-s pulsations from the new burst source in the direction of Sgr A* using data obtained with the NuSTAR Observatory. We detect a strong signal from SGR J1745-2900 presenting a complex pulse profile modulated with pulsed fraction 27+/-3 % in the 3-10 keV band. Two observations spaced 9 days apart allow us to determine a preliminary spin-down rate of Pdot = (6.8+/-1.5)x10^{-12}. This implies a magnetic field B = 1.6x10^14 G, spin-down power Edot = 5.0x10^33 erg/s, and characteristic age P/2Pdot = 8.8x10^3 yr, for the rotating dipole model. However, we note that the current Pdot 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_BB = 0.96+/-0.02 keV and photon index = 1.5+/-0.4, respectively. The neutral hydrogen column density (nH ~ 1.4x10^23 cm^{-2}) measured by NuSTAR and Swift suggests that SGR J1745-2900 is located at or near the Galactic Center. The lack of an X-ray counterpart to SGR J1745-2900 in the published Chandra survey catalog sets a quiescent 2-8 keV luminosity limit of Lx ~< 10^32 erg/s. The bursting, timing, and spectral properties of SGR J1745-2900 indicate the source is a transient magnetar undergoing an outburst with 2-79 keV luminosity up to 3.5x10^35 erg/s for a distance of 8 kpc.
Source:	arXiv, 1305.1945
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