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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Outburst of LSV +44 17 observed by MAXI and RXTE, and discovery of a dip structure in the pulse profile
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Outburst of LSV +44 17 observed by MAXI and RXTE, and discovery of a dip structure in the pulse profile

机译：MAXI和RXTE观测到LSV +44 17的爆发，并在脉冲剖面中发现了倾角结构

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摘要

We report on the first observation of an X-ray outburst of a Be/X-ray binary pulsar, LSV+44 17/RXJ0440.9+4431, and the discovery of an absorption dip structure in the pulse profile. An outburst of this source was discovered by MAXI GSC in 2010 April. It was the first detection of transient activity of LSV+44 17 since the source was identified as a Be/X-ray binary in 1997. From the data of a follow-up RXTE observation near the peak of the outburst, we found a narrow dip structure in its pulse profile, which was clearer in the lower-energy bands. The pulse-phase-averaged energy spectra in the 3-100 keV band could be fitted with a continuum model containing a power-law function with an exponential cutoff and a blackbody component, which are modified at low energy by an absorption component. A weak iron Kα emission line was also detected in the spectra. From the pulse-phase-resolved spectroscopy we found that the absorption column density at the dip phase was much higher than those in the other phases. The dip was not seen in subsequent RXTE observations at lower flux levels. These results suggest that the dip in the pulse profile originates from the eclipse of the radiation from the neutron star by the accretion column.
机译：我们报告了对Be / X射线二进制脉冲星LSV + 44 17 / RXJ0440.9 + 4431的X射线爆发的首次观察，并发现了脉冲剖面中的吸收倾角结构。 MAXI GSC于2010年4月发现了这种来源的爆发。自从1997年该源被确认​​为Be / X射线双星以来，这是对LSV + 44 17瞬时活动的首次检测。从爆发峰值附近的后续RXTE观测数据中，我们发现在脉冲轮廓中具有低位结构，在低能带中更清晰。 3-100 keV波段中的脉冲相位平均能谱可以与包含幂律函数的连续模型拟合，该幂律函数具有指数截止值和黑体分量，它们在低能量下会被吸收分量修改。在光谱中还检测到弱的Kα铁发射线。从脉冲相分辨光谱法，我们发现在浸入相的吸收柱密度比其他相的吸收柱密度高得多。在随后的RXTE观测中，在较低的通量水平下未发现该下降。这些结果表明，脉冲轮廓的下降源自吸积柱对中子星辐射的偏蚀。

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