SWIFT STUDY OF THE FIRST SOFT {gamma}-RAY REPEATER LIKE BURST FROM AXP 1E 1841-045 IN SNR Kes 73
Journal Article
·
· Astrophysical Journal Letters
- Department of Physics and Astronomy, University of Manitoba, Winnipeg, MB R3T 2N2 (Canada)
- Canada Research Chair. (Canada)
We report the study of the short (32 ms) and first soft {gamma}-ray repeater like burst observed from the anomalous X-ray pulsar (AXP) 1E 1841-045 associated with the supernova remnant Kes 73, discovered on 2010 May 6 by the Burst Alert Telescope on board the Swift {gamma}-ray observatory. The 15-100 keV time-averaged burst spectrum is modeled by a single power law (PL) with a photon index {Gamma} = 3.2{sup +1.8}{sub -1.0} and has a fluence of 1.1{sup +0.4}{sub -0.6} x 10{sup -8} erg cm{sup -2}, a luminosity of 2.9{sup +1.1}{sub -1.6} x 10{sup 39} erg s{sup -1}, and an energy of 7.2{sup +0.4}{sub -0.6} x 10{sup 36} erg. The prompt after-burst 0.5-10 keV quiescent spectrum obtained with the Swift X-ray Telescope (XRT) is best fit by an absorbed PL model with {Gamma} = 2.6 {+-} 0.2 and an unabsorbed flux of 9.1{sup +1.2}{sub -1.4} x 10{sup -11} erg cm{sup -2} s{sup -1}. To investigate the pre-burst 0.5-10 keV persistent emission, we analyzed the archival XMM-Newton observations, and the spectra are well fitted by a two-component blackbody plus PL model with a temperature kT = 0.45 {+-} 0.03 keV, {Gamma} = 1.9 {+-} 0.2, and an unabsorbed flux of 4.3{sup +0.9}{sub -1.2} x 10{sup -11} erg cm{sup -2} s{sup -1}. Comparing the Swift-XRT spectrum with the XMM-Newton spectrum, spectral softening post-burst is evident with a 2.1 times increase in the unabsorbed flux. We discuss the burst activity and the persistent emission properties of AXP 1E 1841-045 in comparison with other magnetars and in the context of the magnetar model.
- OSTI ID:
- 21454884
- Journal Information:
- Astrophysical Journal Letters, Journal Name: Astrophysical Journal Letters Journal Issue: 2 Vol. 725; ISSN 2041-8205
- Country of Publication:
- United States
- Language:
- English
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