利用颜色-颜色-强度图分离X射线二进制分类中X射线颜色选择的比较
Comparing X-ray color selection in separating X-ray binary classes using Color-Color-Intensity diagrams
摘要：
X射线双星表现出广泛的性质，但很少有公认的方法来确定致密物体的性质。颜色-颜色-强度图被认为是区分含有黑洞的系统和含有中子星的系统的一种方法。然而，该技术已经通过仅来自一台仪器（RXTE/ASM）的数据进行了验证，该仪器具有使用仅在预定能量带中可用的数据定义的单组X射线颜色。我们用更灵敏的仪器测试了一系列X射线颜色，以确定该方法的可靠性。我们使用来自MAXI气体狭缝相机的数据，该相机允许用户指定能量带。我们测试X射线的颜色，以前已经在文献中定义，以及我们在本文中明确定义的。一组有代表性的系统用于构建每组颜色的颜色-颜色-强度图，以确定哪些最适合分离不同的类别。对于研究单个源，某些波段比其他波段更有效。对于一个特定的能量范围内，分离的软态在黑洞二进制是可能的，只有软和硬的颜色包括信息从最低的能量带。我们确认，颜色-颜色-强度图可以区分系统中包含黑洞或中子星的所有X射线颜色测试，这表明在吸积过程中的普遍性，这些不同的类。我们提出了可能的物理过程驱动不同类别的X射线二进制文件的不同位置的颜色颜色强度图。
英文摘要：
X-ray binaries exhibit a wide range of properties but there are few accepted methods to determine the nature of the compact object. Color-Color-Intensity diagrams have been suggested as a means of distinguishing between systems containing black holes from those containing neutron stars. However, this technique has been verified with data from only one instrument (RXTE/ASM) with a single set of X-ray colors defined using data available only in pre-determined energy bands. We test a selection of X-ray colors with a more sensitive instrument to determine the reliability of this method. We use data from the MAXI Gas Slit Camera, which allows users to specify energy-bands. We test X-ray colors that have been previously defined in the literature as well as ones that we define specifically in this paper. A representative set of systems are used to construct Color-Color-Intensity diagrams in each set of colors to determine which are best for separating different classes. For studying individual sources certain bands are more effective than others. For a specified energy range, the separation of soft states in black hole binaries was possible only where both soft and hard colors included information from the lowest energy band. We confirm that Color-Color-Intensity diagrams can distinguish between systems containing black holes or neutron stars in all X-ray colors tested; this suggests an universality in the accretion processes governing these different classes. We suggest possible physical processes driving different classes of X-ray binaries to different locations in Color-Color-Intensity diagrams.
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