X-ray Monitoring of the Magnetar CXOU J171405.7-381031 in SNR CTB 37B

Abstract

We present the results of our 8 year X-ray monitoring campaign on CXOU J171405.7-381031, the magnetar associated with the faint supernova remnant (SNR) CTB 37B. It is among the youngest by inferred spin-down age, and most energetic in spin-down power of magnetars, and may contribute, at least partially, to the GeV and TeV emission coincident with the SNR. We use a series of Chandra, XMM-Newton, and NuSTAR observations to characterize the timing and spectral properties of the magnetar. The spin-down rate of the pulsar almost doubled in <1 year and then decreased slowly to a more stable value. Its X-ray flux varied by approx, 50%, possibly correlated with the spin down rate. The 1-79 keV spectrum is well-characterized by an absorbed blackbody plus power-law model with an average temperature of kT=0.62+/-0.04 keV and photon index Gamma=0.92+/-0.16, or by a Comptonized blackbody with kT=0.55+/-0.04 keV and an additional hard power law with Gamma=0.70+/-0.20, In contrast with most magnetars, the pulsed signal is found to decrease with energy up to 6 keV, which is apparently caused by mixing with the hard spectral component that is pulse-phase shifted by approx. 0.43 cycles from the soft X-rays. We also analyze the spectrum of the nearby, diffuse nonthermal source XMMU J171410.8-381442, whose relation to the SNR is uncertain.

10 pages, 10 figures, 2 Tables; Latex, aastex63 style. To appear in the Astrophysical Journal

References in corpus (14)

• The Prelude to and Aftermath of the Giant Flare of 2004 December 27: Persistent and Pulsed X-ray Properties of SGR 1806-20 from 1993 to 2005
• Outburst of the 2 s Anomalous X-ray Pulsar 1E 1547.0-5408
• Timing and Flux Evolution of the Galactic Center Magnetar SGR J1745-2900
• Detailed high-energy characteristics of AXP 1RXS J170849-400910 - Probing the magnetosphere using INTEGRAL, RXTE and XMM-Newton
• Deep NuSTAR and Swift Monitoring Observations of the Magnetar 1E 1841-045
• Repeated, Delayed Torque Variations Following X-ray Flux Enhancements in the Magnetar 1E1048.1$-$5937
• A broadband X-ray study of the Geminga pulsar with NuSTAR and XMM-Newton
• NuSTAR Observations of the Magnetar 1E 2259+586
• The Sleeping Monster: NuSTAR observations of SGR 1806-20, 11 years after the Giant Flare
• NuSTAR observations of X-ray bursts from the magnetar 1E 1048.1-5937
• The 2018 X-ray and Radio Outburst of Magnetar XTE J1810-197
• Probing the gamma-ray emission from HESS J1834-087 using H.E.S.S. and Fermi LAT observations
• X-ray and radio studies of SNR CTB 37B hosting the magnetar CXOU J171405.7-381031
• XMM-Newton Spectrum of the magnetar CXOU J171405.7-381031

Cited by in corpus (3)

• Where are the magnetar binary companions? Candidates from a comparison with binary population synthesis predictions
• Long-term XMM-Newton view of magnetar CXOU J010043.1$-$721134: Comprehensive spectral and temporal results
• Discovery of a magnetar candidate X-ray pulsar in the Large Magellanic Cloud