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arXiv 0910.5484astro-ph.HEastro-ph.SR
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周期性新星RS蛇夫座扩展X射线发射的钱德拉探测

Chandra detection of extended X-ray emission from the recurrent nova RS Ophiuchi

G. J. M. Luna, R. Montez, J. L. Sokoloski, K. Mukai, J. H. Kastner

摘要:

对2006年共生的周期性新星蛇夫座RS(RS Oph)爆发的射电、红外和光学观测表明,爆炸产生了非球形的喷出物。其中一些喷出的物质以两极喷流的形式出现在中央源的东部和西部。在这里,我们描述的X射线观测与钱德拉X射线天文台一年半后,爆发的开始,揭示了狭窄的,扩展的结构与位置角约300度(北偏东)。尽管X射线图像中延伸特征的方向与CCD探测器的读出方向一致,但广泛的测试表明该特征不是伪影。假设这不是仪器效应,扩展的X射线结构显示热等离子体从中心双星延伸超过1,900 AU(距离为1.6 kpc)。X射线发射在西北方向被拉长-与已发布的无线电图像中的扩展红外发射和一些次要特征一致。它与射电喷流的方向和主要的双极光学结构不太一致。扩展X射线结构中的大多数光子具有小于0.8 keV的能量。如果扩展的X射线特征是在新星爆发时产生的,那么它在2007年8月的1”.2长度意味着它以超过2质量/天的平均速率扩展,这相当于天空平面中的流速超过6,000 km/s(d/1.6 kpc)。这个膨胀率与最早测量到的射电喷流的膨胀率相似。

英文摘要:

Radio, infrared, and optical observations of the 2006 eruption of the symbiotic recurrent nova RS Ophiuchi (RS Oph) showed that the explosion produced non-spherical ejecta. Some of this ejected material was in the form of bipolar jets to the east and west of the central source. Here we describe Xray observations taken with the Chandra X-ray Observatory one and a half years after the beginning of the outburst that reveal narrow, extended structure with a position angle of approximately 300 degrees (east of north). Although the orientation of the extended feature in the X-ray image is consistent with the readout direction of the CCD detector, extensive testing suggests that the feature is not an artifact. Assuming it is not an instrumental effect, the extended X-ray structure shows hot plasma stretching more than 1,900 AU from the central binary (taking a distance of 1.6 kpc). The X-ray emission is elongated in the northwest direction - in line with the extended infrared emission and some minor features in the published radio image. It is less consistent with the orientation of the radio jets and the main bipolar optical structure. Most of the photons in the extended X-ray structure have energies of less than 0.8 keV. If the extended X-ray feature was produced when the nova explosion occurred, then its 1".2 length as of 2007 August implies that it expanded at an average rate of more than 2 mas/d, which corresponds to a flow speed of greater than 6,000 km/s (d/1.6 kpc) in the plane of the sky. This expansion rate is similar to the earliest measured expansion rates for the radio jets.

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