Swift observations of the Be/X-ray transient system 1A 1118-615

NCU Institutional Repository > 理學院 > 天文研究所 > 期刊論文 > Item 987654321/50783

jsp.display-item.identifier=請使用永久網址來引用或連結此文件: http://ir.lib.ncu.edu.tw/handle/987654321/50783

题名:	Swift observations of the Be/X-ray transient system 1A 1118-615
作者:	Lin,LCC;Takata,J;Kong,AKH;Hwang,CY
贡献者:	天文研究所
关键词:	X-RAY;GINGA OBSERVATIONS;OPTICAL CANDIDATE;HE 3-640;PULSARS;EMISSION;OUTBURST;BINARIES;PERIOD;PERSEI
日期:	2010
上传时间:	2012-03-27 18:10:05 (UTC+8)
出版者:	國立中央大學
摘要:	We report results of Swift observations for the high-mass Be/X-ray binary system 1A 1118-615, during an outburst stage in 2009 January and at a flaring stage in 2009 March. Using the epoch-folding method, we successfully detected a pulsed period of 407.69(2) s in the outburst of January and of 407.26(1) s after the flare detection in March. We find that the spectral detection for the source during outburst can be described by a blackbody model with a high temperature (kT similar to 1-3 keV) and a small radius (R similar to km), indicating that the emission results from the polar cap of the neutron star. On the other hand, the spectra obtained after the outburst can further be described by adding an additional component with a lower temperature (kT similar to 0.1-0.2keV) and a larger emission radius (R similar to 10-500 km), which indicates the emission from around the inner region of an accretion disc. We find that the thermal emission from the hotspot of the accreting neutron star dominates the radiation in outburst; the existence of both this X-ray contribution and the additional soft component suggests that the polar cap and the accretion disc emission might co-exist after the outburst. Because the two-blackbody signature at the flaring stage is a unique feature of 1A 1118-615, our spectral results may provide a new insight to interpret the X-ray emission for the accreting neutron star. The time separation between the three main outbursts of this system is similar to 17 yr and it might be related to the orbital period. We derive and discuss the associated physical properties by assuming the elongated orbit for this specific Be/X-ray transient.
關聯:	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
显示于类别:	[天文研究所] 期刊論文

文件中的档案:

档案	描述	大小	格式	浏览次数
index.html		0Kb	HTML	441	检视/开启

在NCUIR中所有的数据项都受到原著作权保护.

社群 sharing

数据加载中.....