Insight-HXMT Observations of 4U 1636-536: Corona Cooling Revealed with Single Short Type-I X-Ray Burst

被引：54

作者：

Chen, Y. P. ^{[1
]}

Zhang, S. ^{[1
]}

Qu, J. L. ^{[1
]}

Zhang, S. N. ^{[1
,2
]}

Ji, L. ^{[3
]}

Kong, L. D. ^{[1
]}

Cao, X. L. ^{[1
]}

Chang, Z. ^{[1
]}

Chen, G. ^{[1
]}

Chen, L. ^{[4
]}

Chen, T. X. ^{[1
]}

Chen, Y. ^{[1
]}

Chen, Y. B. ^{[5
]}

Cui, W. ^{[1
,5
]}

Cui, W. W. ^{[1
]}

Deng, J. K. ^{[5
]}

Dong, Y. W. ^{[1
]}

Du, Y. Y. ^{[1
]}

Fu, M. X. ^{[5
]}

Gao, G. H. ^{[1
,2
]}

Gao, H. ^{[1
,2
]}

Gao, M. ^{[1
]}

Ge, M. Y. ^{[1
]}

Gu, Y. D. ^{[1
]}

Guan, J. ^{[1
]}

Guo, C. C. ^{[1
,2
]}

Han, D. W. ^{[1
]}

Hu, W. ^{[1
]}

Huang, Y. ^{[1
]}

Huo, J. ^{[1
]}

Jia, S. M. ^{[1
]}

Jiang, L. H. ^{[1
]}

Jiang, W. C. ^{[1
]}

Jin, J. ^{[1
]}

Jin, Y. J. ^{[5
]}

Li, B. ^{[1
]}

Li, C. K. ^{[1
]}

Li, G. ^{[1
]}

Li, M. S. ^{[1
]}

Li, T. P. ^{[1
,2
,5
]}

Li, W. ^{[1
]}

Li, X. ^{[1
]}

Li, X. B. ^{[1
]}

Li, X. F. ^{[1
]}

Li, Y. G. ^{[1
]}

Li, Z. J. ^{[1
,2
]}

Li, Z. W. ^{[1
]}

Liang, X. H. ^{[1
]}

Liao, J. Y. ^{[1
]}

Liu, C. Z. ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, 19B Yuquan Rd, Beijing 100049, Peoples R China

[2] Univ Chinese Acad Sci, Chinese Acad Sci, Beijing 100049, Peoples R China

[3] Eberhard Karls Univ Tubingen, Kepler Ctr Astro & Particle Phys, Inst Astron & Astrophys, Sand 1, D-72076 Tubingen, Germany

[4] Beijing Normal Univ, Dept Astron, Beijing 100088, Peoples R China

[5] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2018年 / 864卷 / 02期

基金：

国家重点研发计划; 中国国家自然科学基金;

关键词：

stars: coronae; stars: neutron; X-rays: binaries; X-rays: bursts; X-rays: individual (4U 1636-536);

D O I：

10.3847/2041-8213/aadc0e

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Corona cooling was detected previously from stacking a series of short type I bursts that occurred during the low/hard state of an atoll outburst. Type I bursts are hence regarded as sharp probes used to better our understanding of the basic properties of the corona. The first Chinese X-ray satellite, Insight-HXMT, has a large detection area at hard X-rays that provides a unique opportunity to move further in this research field. We report the first detection of corona cooling by Insight-HXMT from a single short type I burst appearing during the flare of 4U 1636-536. This type I X-ray burst has a duration of similar to 13 s and hard X-ray shortage is detected with a significance of 6.2 sigma in 40-70 keV. A cross-correlation analysis between the light curves of the soft and hard X-ray band shows that the corona shortage lags the burst emission by 1.6 +/- 1.2 s. These results are consistent with those derived previously from stacking a large amount of bursts detected by RXTE/PCA within a series of flares of 4U 1636-536. Moreover, the broad bandwidth of Insight-HXMT also allows, for the first time, one to infer the burst influence upon the continuum spectrum via performing the spectral fitting of the burst, which points to the finding that hard X-ray shortage appears at around 40 keV in the continuum spectrum. These results suggest that the evolution of the corona, along with the outburst/flare of NS XRB, may be traced via analyzing a series of embedded type I bursts using Insight-HXMT.

引用

页数：5

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