NuSTAR OBSERVATIONS OF X-RAY BURSTS FROM THE MAGNETAR 1E 1048.1-5937

被引：31

作者：

An, Hongjun ^{[1
]}

Kaspi, Victoria M. ^{[1
]}

Beloborodov, Andrei M. ^{[2
]}

Kouveliotou, Chryssa ^{[3
]}

Archibald, Robert F. ^{[1
]}

Boggs, Steven E. ^{[4
]}

Christensen, Finn E. ^{[5
]}

Craig, William W. ^{[4
,6
]}

Gotthelf, Eric V. ^{[2
]}

Grefenstette, Brian W. ^{[7
]}

Hailey, Charles J. ^{[2
]}

Harrison, Fiona A. ^{[7
]}

Madsen, Kristin K. ^{[7
]}

Mori, Kaya ^{[2
]}

Stern, Daniel ^{[8
]}

Zhang, William W. ^{[9
]}

机构：

[1] McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada

[2] Columbia Univ, Columbia Astrophys Lab, New York, NY 10027 USA

[3] NASA, George C Marshall Space Flight Ctr, Space Sci Off, Huntsville, AL 35812 USA

[4] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA

[5] Tech Univ Denmark, Natl Space Inst, DTU Space, DK-2800 Lyngby, Denmark

[6] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

[7] CALTECH, Cahill Ctr Astron & Astrophys, Pasadena, CA 91125 USA

[8] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA

[9] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

来源：

ASTROPHYSICAL JOURNAL | 2014年 / 790卷 / 01期

基金：

美国国家航空航天局; 加拿大自然科学与工程研究理事会;

关键词：

pulsars: individual (1E 1048.1-5937); stars: magnetars; stars: neutron; X-rays: bursts; SOFT GAMMA-REPEATERS; NEUTRON-STARS; SGR; 1627-41; PULSAR; 1E-1048.1-5937; VARIABILITY; SGR-1900+14; QUIESCENCE; EMISSION; OUTBURST;

D O I：

10.1088/0004-637X/790/1/60

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the detection of eight bright X-ray bursts from the 6.5 s magnetar 1E 1048.1-5937, during a 2013 July observation campaign with the Nuclear Spectroscopic Telescope Array. We study the morphological and spectral properties of these bursts and their evolution with time. The bursts resulted in count rate increases by orders of magnitude, sometimes limited by the detector dead time, and showed blackbody spectra with kT 6-8 keV in the T90 duration of 1-4 s, similar to earlier bursts detected from the source. We find that the spectra during the tail of the bursts can be modeled with an absorbed blackbody with temperature decreasing with flux. The burst flux decays followed a power law of index 0.8-0.9. In the burst tail spectra, we detect a 13 keV emission feature, similar to those reported in previous bursts from this source as well as from other magnetars observed with the Rossi X-ray Timing Explorer. We explore possible origins of the spectral feature such as proton cyclotron emission, which implies a magnetic field strength of B 2x10(15) G in the emission region. However, the consistency of the energy of the feature in different objects requires further explanation.

引用

页数：9

共 37 条

[1] SPECTRAL AND TIMING PROPERTIES OF THE MAGNETAR CXOU J164710.2-455216 [J].