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arXiv 0707.4155astro-ph
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黑洞候选者XTE J1817-330的XMM-牛顿和INTEGRAL观测

XMM-Newton and INTEGRAL observations of the black hole candidate XTE J1817-330

Gloria Sala, Jochen Greiner, Marco Ajello, Eugenio Bottacini, Franck Haberl

摘要:

银河系黑洞候选者XTE J1817-330于2006年1月在爆发中被RXTE发现。我们在这里介绍的XMM-牛顿目标的机会观测(TOO),在2006年3月13日(最大值后44天),并在2006年2月15日至18日(最大值后18天)进行的INTEGRAL观测的结果。XMM-Newton机载EPIC-pn相机用于快速读出突发模式,以避免光子堆积,而RGS用于光谱高计数率模式。我们拟合的XMM-牛顿和积分光谱与两个组件的模型组成的热吸积盘和康普顿热日冕。软X射线谱主要由吸积盘组成,最高温度从INTEGRAL观测时的0.96+/-0.04 keV下降到3月13日的0.70+/-m0.01 keV。INTEGRAL和XMM-Newton上的光学望远镜显示了V:11.3-11.4,U:15.0-15.1和UVW 1:14.7-14.8等的源。软X射线光谱,连同光学和紫外数据,显示出低的氢柱密度朝向源,和几个吸收线,最有可能的星际起源,在RGS光谱中检测到:OI K-α,OI K-β,OII,OIII和OVII,跟踪ISM的冷和热组件。软X射线光谱表明存在一个黑洞,估计质量上限为6.0(+4.0/-2.5)Msun。

英文摘要:

The galactic black hole candidate XTE J1817-330 was discovered in outburst by RXTE in January 2006. We present here the results of an XMM-Newton Target of opportunity observation (TOO), performed on 13 March 2006 (44 days after the maximum), and an INTEGRAL observation performed on 15-18 February 2006 (18 days after the maximum). The EPIC-pn camera on-board XMM-Newton was used in the fast read-out Burst mode to avoid photon pile-up, while the RGSs were used in Spectroscopy high count-rate mode. We fit both the XMM-Newton and the INTEGRAL spectra with a two-component model consisting of a thermal accretion disk and a comptonizing hot corona. The soft X-ray spectrum is dominated by an accretion disk component, with a maximum temperature decreasing from 0.96+/-0.04 keV at the time of the INTEGRAL observation to 0.70+/-m0.01 keV on 13 March. The Optical Monitors on board INTEGRAL and XMM-Newton showed the source with magnitudes V: 11.3-11.4, U:15.0-15.1 and UVW1:14.7-14.8. The soft X-ray spectrum, together with the optical and UV data, show a low hydrogen column density towards the source, and several absorption lines, most likely of interstellar origin, are detected in the RGS spectrum: OI K-alpha, OI K-beta, OII, OIII and OVII, which trace both cold and hot components of the ISM. The soft X-ray spectrum indicates the presence of a black hole, with an estimate for the upper limit of the mass of 6.0(+4.0/-2.5) Msun.

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