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北美退伍军人节(Veterans Day),12 日无更新
arXiv 2003.07579astro-ph.HE
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亮环礁源GX 9+9的反射分量

Reflection component in the Bright Atoll Source GX 9+9

R. Iaria, S. M. Mazzola, T. Di Salvo, A. Marino, A. F. Gambino, A. Sanna, A. Riggio, L. Burderi

摘要:

GX 9+9(4U 1728-16)是一颗低质量X射线双星(LMXB),其中有一颗中子星。虽然它与GX 9+1、GX 3+1和GX 13+1一起属于明亮的环礁源的子类,但它的宽带光谱研究很少,并且在光谱中显然没有显示出反射特征。为了很好地约束连续谱并验证是否存在相对论性模糊反射分量,我们使用覆盖0.3-40 keV能带的{ \it BeppoSAX}和\textit{XMM-Newton}谱分析了GX 9+9的宽带谱。我们拟合的光谱采用的模型组成的一个磁盘黑体加上康普顿组件的种子光子有一个黑体光谱(东方模型)。统计等效模型由康普顿化分量组成,康普顿化分量的种子光子具有圆盘黑体分布,加上模拟可能与边界层相关的饱和康普顿化的黑体(西方模型)。其他试验没有返回良好的拟合。在软态下观测到GX 9+9的光谱,假定到源的距离为5千秒差距,其光度为$2.3 \times 10^{37}$ erg s $^{-1}$。在东方模型中,康普顿化组分的种子光子温度和电子温度分别为$1.14^{+0.10}_{-0.07}$ keV和$2.80^{+0.09}_{-0.04}$ keV,康普顿化日冕的光学厚度为$8.9\pm0.4$ .内吸积盘的色温为$0.86^{+0.08}_{-0.02}$ keV和$0.82 \pm 0.02$ keV的{ \it BeppoSAX}和\textit{XMM-Newton}光谱,分别。相反,在西方模型的情况下,我们发现种子光子的温度是$0.87 \pm 0.07$ keV和$1.01 \pm 0.08$ keV的{ \it BeppoSAX}和\textit{XMM-Newton}光谱,分别。(摘要摘要)

英文摘要:

GX 9+9 (4U 1728-16) is a low mass X-ray binary (LMXB) source harboring a neutron star. Although it belongs to the subclass of the bright Atoll sources together with GX 9+1, GX 3+1, and GX 13+1, its broadband spectrum is poorly studied and apparently does not show reflection features in the spectrum. To constrain the continuum well and verify whether a relativistic smeared reflection component is present, we analyze the broadband spectrum of GX 9+9 using {\it BeppoSAX} and \textit{XMM-Newton} spectra covering the 0.3-40 keV energy band. We fit the spectrum adopting a model composed of a disk-blackbody plus a Comptonized component whose seed photons have a blackbody spectrum (Eastern Model). A statistically equivalent model is composed of a Comptonized component whose seed photons have a disk-blackbody distribution plus a blackbody that mimics a saturated Comptonization likely associated with a boundary layer (Western model). Other trials did not return a good fit. The spectrum of GX 9+9 was observed in a soft state and its luminosity is $2.3 \times 10^{37}$ erg s$^{-1}$ assuming a distance to the source of 5 kpc. In the Eastern Model scenario, we find the seed-photon temperature and electron temperature of the Comptonized component to be $1.14^{+0.10}_{-0.07}$ keV and $2.80^{+0.09}_{-0.04}$ keV, respectively, while the optical depth of the Comptonizing corona is $8.9\pm0.4$. The color temperature of the inner accretion disk is $0.86^{+0.08}_{-0.02}$ keV and $0.82 \pm 0.02$ keV for the {\it BeppoSAX} and \textit{XMM-Newton} spectrum, respectively. In the Western Model scenario, instead, we find that the seed-photon temperature is $0.87 \pm 0.07$ keV and $1.01 \pm 0.08$ keV for the {\it BeppoSAX} and \textit{XMM-Newton} spectrum, respectively. (Abridged abstract)

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