天龙座NGC 6338最亮星系X射线空洞的系统研究
Systematic study of X-ray Cavities in the brightest galaxy of the Draco Constellation NGC 6338
摘要：
我们目前的钱德拉档案数据的最亮的星系天龙座NGC 6338的系统分析的基础上，以调查的X射线腔的属性。在中央约6千秒差距，至少有两个，可能是三个，X射线空腔是明显的。所有这些空洞都大致呈椭球形，表面亮度降低了百分之几十。除了这些空洞外，还观察到一组X射线亮丝，它们在15 kpc的范围内与Hα丝在空间上重合。Hα发射线灯丝垂直于X射线腔.对灯丝和空腔中的热气体的光谱分析表明，X射线灯丝比空腔中包含的气体更冷。该系统中观察到的Hα发射线细丝的发射线比和延伸的、不对称的性质需要比恒星形成和/或年轻大质量恒星产生的电离源更硬的电离源。从1.4 GHz VLA FIRST测量数据分析得到的无线电发射图未能显示这些X射线空腔与无线电喷流的任何关联，然而，空腔被无线电发射填充。腔的总功率为17 \times 1042 erg s-1，射电光度与腔功率之比约为10-4，这意味着大部分喷流功率是机械的。
英文摘要：
We present results based on the systematic analysis of currently available Chandra archive data on the brightest galaxy in the Draco constellation NGC 6338, in order to investigate the properties of the X-ray cavities. In the central ~6 kpc, at least a two and possibly three, X-ray cavities are evident. All these cavities are roughly of ellipsoidal shapes and show a decrement in the surface brightness of several tens of percent. In addition to these cavities, a set of X-ray bright filaments are also noticed which are spatially coincident with the Hα filaments over an extent of 15 kpc. The Hα emission line filaments are perpendicular to the X- ray cavities. Spectroscopic analysis of the hot gas in the filaments and cavities reveal that the X-ray filaments are cooler than the gas contained in the cavities. The emission line ratios and the extended, asymmetric nature of the Hα emission line filaments seen in this system require a harder ionizing source than that produced by star formation and/or young, massive stars. Radio emission maps derived from the analysis of 1.4 GHz VLA FIRST survey data failed to show any association of these X-ray cavities with radio jets, however, the cavities are filled by radio emission. The total power of the cavities is 17\times 1042 erg s-1 and the ratio of the radio luminosity to cavity power is ~ 10-4, implying that most of the jet power is mechanical.
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