Nustar discovery of a 3.76 S transient magnetar near sagittarius A

Kaya Mori, Eric V. Gotthelf, Shuo Zhang, Hongjun An, Frederick K. Baganoff, Nicolas M. Barrière, Andrei M. Beloborodov, Steven E. Boggs, Finn E. Christensen, William W. Craig, Francois Dufour, Brian W. Grefenstette, Charles J. Hailey, Fiona A. Harrison, Jaesub Hong, Victoria M. Kaspi, Jamie A. Kennea, Kristin K. Madsen, Craig B. Markwardt, Melania Nynka & 3 others Daniel Stern, John A. Tomsick, William W. Zhang

Research output: Contribution to journalArticle

113 Citations (Scopus)

Abstract

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 =(6.5 ± 1.4) × 10-12. This implies a magnetic field B = 1.6 × 1014 G, spin-down power =5 × 1033 erg s-1, and characteristic age P/2 =9 × 103 yr for the rotating dipole model. However, the current 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 Γ = 1.5 ± 0.4. The neutral hydrogen column density (N H ∼ 1.4 × 1023 cm -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 Lx ≲ 1032 erg s-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.

Original languageEnglish (US)
Article numberL23
JournalAstrophysical Journal Letters
Volume770
Issue number2
DOIs
StatePublished - Jun 20 2013

Fingerprint

magnetars
erg
outburst
luminosity
erratic
pulsars
neutron stars
catalogs
bursts
observatories
power law
x rays
observatory
time measurement
hydrogen
radio
dipoles
magnetic field
modulation
photons

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Mori, K., Gotthelf, E. V., Zhang, S., An, H., Baganoff, F. K., Barrière, N. M., ... Zhang, W. W. (2013). Nustar discovery of a 3.76 S transient magnetar near sagittarius A. Astrophysical Journal Letters, 770(2), [L23]. https://doi.org/10.1088/2041-8205/770/2/L23
Mori, Kaya ; Gotthelf, Eric V. ; Zhang, Shuo ; An, Hongjun ; Baganoff, Frederick K. ; Barrière, Nicolas M. ; Beloborodov, Andrei M. ; Boggs, Steven E. ; Christensen, Finn E. ; Craig, William W. ; Dufour, Francois ; Grefenstette, Brian W. ; Hailey, Charles J. ; Harrison, Fiona A. ; Hong, Jaesub ; Kaspi, Victoria M. ; Kennea, Jamie A. ; Madsen, Kristin K. ; Markwardt, Craig B. ; Nynka, Melania ; Stern, Daniel ; Tomsick, John A. ; Zhang, William W. / Nustar discovery of a 3.76 S transient magnetar near sagittarius A. In: Astrophysical Journal Letters. 2013 ; Vol. 770, No. 2.
@article{691a0b93123d43a592cb552cde599900,
title = "Nustar discovery of a 3.76 S transient magnetar near sagittarius A",
abstract = "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 =(6.5 ± 1.4) × 10-12. This implies a magnetic field B = 1.6 × 1014 G, spin-down power =5 × 1033 erg s-1, and characteristic age P/2 =9 × 103 yr for the rotating dipole model. However, the current 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 Γ = 1.5 ± 0.4. The neutral hydrogen column density (N H ∼ 1.4 × 1023 cm -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 Lx ≲ 1032 erg s-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.",
author = "Kaya Mori and Gotthelf, {Eric V.} and Shuo Zhang and Hongjun An and Baganoff, {Frederick K.} and Barri{\`e}re, {Nicolas M.} and Beloborodov, {Andrei M.} and Boggs, {Steven E.} and Christensen, {Finn E.} and Craig, {William W.} and Francois Dufour and Grefenstette, {Brian W.} and Hailey, {Charles J.} and Harrison, {Fiona A.} and Jaesub Hong and Kaspi, {Victoria M.} and Kennea, {Jamie A.} and Madsen, {Kristin K.} and Markwardt, {Craig B.} and Melania Nynka and Daniel Stern and Tomsick, {John A.} and Zhang, {William W.}",
year = "2013",
month = "6",
day = "20",
doi = "10.1088/2041-8205/770/2/L23",
language = "English (US)",
volume = "770",
journal = "Astrophysical Journal Letters",
issn = "2041-8205",
publisher = "IOP Publishing Ltd.",
number = "2",

}

Mori, K, Gotthelf, EV, Zhang, S, An, H, Baganoff, FK, Barrière, NM, Beloborodov, AM, Boggs, SE, Christensen, FE, Craig, WW, Dufour, F, Grefenstette, BW, Hailey, CJ, Harrison, FA, Hong, J, Kaspi, VM, Kennea, JA, Madsen, KK, Markwardt, CB, Nynka, M, Stern, D, Tomsick, JA & Zhang, WW 2013, 'Nustar discovery of a 3.76 S transient magnetar near sagittarius A', Astrophysical Journal Letters, vol. 770, no. 2, L23. https://doi.org/10.1088/2041-8205/770/2/L23

Nustar discovery of a 3.76 S transient magnetar near sagittarius A. / Mori, Kaya; Gotthelf, Eric V.; Zhang, Shuo; An, Hongjun; Baganoff, Frederick K.; Barrière, Nicolas M.; Beloborodov, Andrei M.; Boggs, Steven E.; Christensen, Finn E.; Craig, William W.; Dufour, Francois; Grefenstette, Brian W.; Hailey, Charles J.; Harrison, Fiona A.; Hong, Jaesub; Kaspi, Victoria M.; Kennea, Jamie A.; Madsen, Kristin K.; Markwardt, Craig B.; Nynka, Melania; Stern, Daniel; Tomsick, John A.; Zhang, William W.

In: Astrophysical Journal Letters, Vol. 770, No. 2, L23, 20.06.2013.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Nustar discovery of a 3.76 S transient magnetar near sagittarius A

AU - Mori, Kaya

AU - Gotthelf, Eric V.

AU - Zhang, Shuo

AU - An, Hongjun

AU - Baganoff, Frederick K.

AU - Barrière, Nicolas M.

AU - Beloborodov, Andrei M.

AU - Boggs, Steven E.

AU - Christensen, Finn E.

AU - Craig, William W.

AU - Dufour, Francois

AU - Grefenstette, Brian W.

AU - Hailey, Charles J.

AU - Harrison, Fiona A.

AU - Hong, Jaesub

AU - Kaspi, Victoria M.

AU - Kennea, Jamie A.

AU - Madsen, Kristin K.

AU - Markwardt, Craig B.

AU - Nynka, Melania

AU - Stern, Daniel

AU - Tomsick, John A.

AU - Zhang, William W.

PY - 2013/6/20

Y1 - 2013/6/20

N2 - 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 =(6.5 ± 1.4) × 10-12. This implies a magnetic field B = 1.6 × 1014 G, spin-down power =5 × 1033 erg s-1, and characteristic age P/2 =9 × 103 yr for the rotating dipole model. However, the current 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 Γ = 1.5 ± 0.4. The neutral hydrogen column density (N H ∼ 1.4 × 1023 cm -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 Lx ≲ 1032 erg s-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.

AB - 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 =(6.5 ± 1.4) × 10-12. This implies a magnetic field B = 1.6 × 1014 G, spin-down power =5 × 1033 erg s-1, and characteristic age P/2 =9 × 103 yr for the rotating dipole model. However, the current 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 Γ = 1.5 ± 0.4. The neutral hydrogen column density (N H ∼ 1.4 × 1023 cm -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 Lx ≲ 1032 erg s-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.

UR - http://www.scopus.com/inward/record.url?scp=84879116419&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84879116419&partnerID=8YFLogxK

U2 - 10.1088/2041-8205/770/2/L23

DO - 10.1088/2041-8205/770/2/L23

M3 - Article

VL - 770

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

SN - 2041-8205

IS - 2

M1 - L23

ER -

Mori K, Gotthelf EV, Zhang S, An H, Baganoff FK, Barrière NM et al. Nustar discovery of a 3.76 S transient magnetar near sagittarius A. Astrophysical Journal Letters. 2013 Jun 20;770(2). L23. https://doi.org/10.1088/2041-8205/770/2/L23