Broadband Observations of the New X-Ray Burster SAX J1747.0–2853 during the 1998 March Outburst
Broadband Observations of the New X-Ray Burster SAX J1747.0–2853 during the 1998 March Outburst
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1998 年 3 月爆发期间新 X 射线爆发 SAX J1747.0–2853 的宽带观测
DOI：
10.1086/318173
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
Netherlands.
中科院分区：
文献类型：
--
作者：
L. Natalucci;A. Bazzano;M. Cocchi;P. Ubertini;J. Heise;E. Kuulkers;J.J.M. in 't Zand Istituto di Astrofisica SpazialeCNR;Roma;Italy.;Space Research Organization Netherlands;Utrecht;Netherlands.
本文报道了我们用BeppoSAX宽视场照相机在1998年3月10日的爆发中探测到的2-28 keV能量范围内的X射线源SAXJ1747.0 -2853的发现和跟踪观测。源位于银河核外约0.5 °处。1998年春季共探测到14次I型X射线爆发，从而确定该天体可能是一个低质量X射线双星，其中包含一颗弱磁化中子星星。光球半径膨胀的证据至少存在于一个观测到的爆发中，导致源距离的估计约为9千秒差距。我们于3月23日使用BeppoSAX窄场仪器进行了一次机会观察的随访目标，总耗时为7.2 × 104 s。在2-10 keV能量范围内，源的持续光度为2.6 × 1036 ergs-1。宽带光谱数据（1-200 keV）与探测到的高达~150 keV的显著硬X射线光谱一致，在低能量（NH = 1023 cm-2）下高度吸收，并且在~7 keV处具有吸收边的明确证据。还观察到一个软的热分量，这可以描述为在~0.6 keV的单温黑体发射。
We report on our discovery and follow-up observations of the X-ray source SAX J1747.0-2853 detected in outburst on 1998 March 10 with the BeppoSAX Wide-Field Cameras in the energy range 2-28 keV. The source is located about 0.°5 off the Galactic nucleus. A total of 14 type I X-ray bursts were detected in spring of 1998, thus identifying the object as a likely low-mass X-ray binary harboring a weakly magnetized neutron star. Evidence for photospheric radius expansion is present in at least one of the observed bursts, leading to an estimate of the source distance of ~9 kpc. We performed a follow-up target of opportunity observation with the BeppoSAX narrow-field instruments on March 23 for a total elapsed time of 7.2 × 104 s. The source persistent luminosity was 2.6 × 1036 ergs s-1 in the 2-10 keV energy range. The broadband spectral data (1-200 keV) are consistent with a remarkable hard X-ray spectrum detected up to ~150 keV, highly absorbed at low energies (NH ≃ 1023 cm-2) and with clear evidence for an absorption edge at ~7 keV. A soft thermal component is also observed, which can be described by single-temperature blackbody emission at ~0.6 keV.