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arXiv 0811.0983astro-ph
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AX J1845的INTEGRAL和XMM-牛顿观测值.0-0433

INTEGRAL and XMM-Newton observations of AX J1845.0-0433

J. A. Zurita Heras, R. Walter

摘要:

AX J1845.0-0433是ASCA发现的一颗瞬变高质量X射线双星。该源显示了最近用INTEGRAL观测到的明亮而短暂的耀斑。瞬态行为和明亮的和短的耀斑进行了研究,以了解吸积机制和源的性质。利用公共INTEGRAL资料和定点XMM-牛顿观测资料,详细研究了耀斑和静止相。AX J1845.0-0433是一颗持久的X射线双星,有一颗O9.5I超巨星伴星,发射0.2-100 keV的低光度,约为1 e35 erg/s,很少有耀斑达到1 e36 erg/s的光度。最准确的X光位置是右心房(2000)=18h45m01s.4和Dec. = -04deg33 '57“”.7(不确定度2“)。在短至数百秒的时间尺度上观察到50的可变性因子。宽带高能谱是典型的风馈吸积双星,其内禀吸收为NH=(2.6+/-0.2 e22 cm-2),硬连续谱为Gamma=(0.7-0.9)+/-0.1,高能截止为Ecut=16+/-3 keV。在低能量下也观察到一个多余的安装与一个黑体的温度为kT=0.18+/-0.05 keV。光学薄和高度电离的铁(Fe XVIII-XIX)位于超巨星附近,在静止阶段被检测到。X射线连续谱的光谱形状是恒定的。与持续的静态辐射相比,耀斑特征表明质量为M1 e22 g的团簇是在超巨星伴星的星风中形成的。

英文摘要:

AX J1845.0-0433 is a transient high-mass X-ray binary discovered by ASCA. The source displays bright and short flares observed recently with INTEGRAL. The transient behaviour and the bright and short flares are studied in order to understand the accretion mechanisms and the nature of the source. Public INTEGRAL data and a pointed XMM-Newton observation are used to study in details the flaring and quiescent phases. AX J1845.0-0433 is a persistent X-ray binary with a O9.5I supergiant companion emitting at a low 0.2-100 keV luminosity of ~1e35 erg/s with seldom flares reaching luminosities of 1e36 erg/s. The most-accurate X-ray position is R.A. (2000) =18h45m01s.4 and Dec. = -04deg33'57''.7 (uncertainty 2''). Variability factors of 50 are observed on time scale as short as hundreds of seconds. The broad-band high-energy spectrum is typical of wind-fed accreting pulsars with an intrinsic absorption of NH=(2.6+/-0.2)e22 cm-2, a hard continuum of Gamma=(0.7-0.9)+/-0.1 and a high-energy cutoff at Ecut=16+/-3 keV. An excess at low energies is also observed fitted with a black body with a temperature of kT=0.18+/-0.05 keV. Optically-thin and highly-ionised iron (Fe XVIII-XIX) located near the supergiant star is detected during the quiescence phase. The spectral shape of the X-ray continuum is constant. The flare characteristics in contrast to the persistent quiescent emission suggest that clumps of mass M~1e22 g are formed within the stellar wind of the supergiant companion.

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