INTEGRAL and Swift/XRT observations of IGR J18179−1621
INTEGRAL and Swift/XRT observations of IGR J18179−1621
复制标题
IGR J18179−1621 的积分和 Swift/XRT 观测
DOI：
10.1111/j.1745-3933.2012.01313.x
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
J. M. Wang
中科院分区：
文献类型：
--
作者：
J. Li;S. Zhang;D. Torres;A. Papitto;Y. Chen;J. M. Wang
IGR J18179-1621 is a hard X-ray binary transient discovered recently by INTEGRAL. Here we report on detailed timing and spectral analysis of IGR J18179-1621 in X-rays based on available INTEGRAL and Swift data. From the INTEGRAL analysis, IGR J18179-1621 is detected with a significance of 21.6s in the 1840 keV band by ISGRI and 15.3s in the 325 keV band by JEM-X, between 2012 February 29 and 2012 March 1. We analyse two quasi-simultaneous Swift ToO observations. A clear 11.82-s pulsation is detected above the white noise at a confidence level larger than 99.99 per cent. The pulse fraction is estimated as 22 +/- 8 per cent at 0.210 keV. No sign of pulsation is detected by INTEGRAL/ISGRI in the 1840 keV band. With Swift and INTEGRAL spectra combined in soft and hard X-rays, IGR J18179-1621 could be fitted by an absorbed power law with a high-energy cut-off plus a Gaussian absorption line centred at 21.5 keV. An additional absorption intrinsic to the source is found, while the absorption line is evidence for a most probable origin from cyclotron resonant scattering and suggests a magnetic field in the emitting region of 2.4 x 1012 G.
影响因子：
4.9
作者：
Gehrels, N;Chincarini, G;Zhang, WW
通讯作者：
Zhang, WW