2013ApJ...770L..23M


Query : 2013ApJ...770L..23M

2013ApJ...770L..23M - Astrophys. J., 770, L23 (2013/June-3)

NuSTAR discovery of a 3.76 s transient magnetar near Sagittarius A*.

MORI K., GOTTHELF E.V., ZHANG S., AN H., BAGANOFF F.K., BARRIERE N.M., BELOBORODOV A.M., BOGGS S.E., CHRISTENSEN F.E., CRAIG W.W., DUFOUR F., GREFENSTETTE B.W., HAILEY C.J., HARRISON F.A., HONG J., KASPI V.M., KENNEA J.A., MADSEN K.K., MARKWARDT C.B., NYNKA M., STERN D., TOMSICK J.A. and ZHANG W.W.

Abstract (from CDS):

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}P =(6.5±1.4)x10–12. This implies a magnetic field B = 1.6x1014 G, spin-down power {dot}E =5x1033 erg/s, and characteristic age P/2{dot}P =9x103 yr for the rotating dipole model. However, the current {dot}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 kTBB= 0.96 ±0.02 keV and photon index Γ = 1.5±0.4. The neutral hydrogen column density (NH∼ 1.4x1023/cm2) 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 Lx ≲ 1032 erg/s. The bursting, timing, and spectral properties indicate a transient magnetar undergoing an outburst with 2-79 keV luminosity up to 3.5x1035 erg/s 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.

Abstract Copyright:

Journal keyword(s): Galaxy: center - pulsars: general - pulsars: individual: SGR J1745-29 - stars: neutron

Simbad objects: 7

goto Full paper

goto View the references in ADS

Number of rows : 7
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 PSR J1550-5418 Psr 15 50 54.18 -54 18 23.9           ~ 356 1
2 PSR J1622-4950 Psr 16 22 44.80 -49 50 54.4           ~ 114 0
3 NAME Galactic Center gam 17 45 39.60213 -29 00 22.0000           ~ 12317 0
4 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3686 3
5 PSR J1745-2900 Psr 17 45 40.1640 -29 00 29.818           ~ 251 0
6 AX J1809.8-1943 Psr 18 09 51.07 -19 43 51.8           ~ 390 0
7 1WGA J1822.2-1604 X 18 22 18.32 -16 04 27.2           ~ 115 0

To bookmark this query, right click on this link: simbad:objects in 2013ApJ...770L..23M and select 'bookmark this link' or equivalent in the popup menu


2021.08.03-12:12:32

© Université de Strasbourg/CNRS

    • Contact