Expanding Bipolar X-Ray Structure After the 2006 Eruption of RS Oph
Expanding Bipolar X-Ray Structure After the 2006 Eruption of RS Oph
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DOI：
10.3847/1538-4357/ac4583
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发表时间：
2021-10
期刊：
影响因子：
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通讯作者：
R. Montez;G. Luna;K. Mukai;J. Sokoloski;J. Kastner
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作者：
R. Montez;G. Luna;K. Mukai;J. Sokoloski;J. Kastner
我们报告的探测和分析的扩展X射线发射的钱德拉X射线天文台源于2006年爆发的经常性新星RS Oph。在2006年爆发开始后的1254天和1927天检测到了扩展发射，并且与天空东西方向的双极流一致，张开角约为70°。两个叶的长度似乎从2009年的1.“3扩大到2011年的2.”0，这表明在天空平面上的预计膨胀率为1.1 ± 0.1质量日-1，膨胀速度为4600 km s-1（D/2.4 kpc）。这一膨胀率与以前对类似方向的物质进行光学和射电观测的估计是一致的。X射线发射没有显示2009年至2011年间任何冷却的证据，这与材料的自由膨胀一致。这一发现表明，某种机制使喷出物远离赤道平面，并且在这些物质穿过红巨星风之后，它自由膨胀到1985年爆发留下的空腔中。我们预计类似的结构将出现在最近的喷发中，并扩展到2006年喷发形成的洞穴中。
We report on the detection and analysis of extended X-ray emission by the Chandra X-ray Observatory stemming from the 2006 eruption of the recurrent nova RS Oph. The extended emission was detected 1254 and 1927 days after the start of the 2006 eruption and is consistent with a bipolar flow oriented in the East–West direction of the sky with opening angles of approximately 70°. The length of both lobes appeared to expand from 1.″3 in 2009 to 2.″0 in 2011, suggesting a projected expansion rate of 1.1 ± 0.1 mas day−1 and an expansion velocity of 4600 km s−1 (D/2.4 kpc) in the plane of the sky. This expansion rate is consistent with previous estimates from optical and radio observations of material in a similar orientation. The X-ray emission does not show any evidence of cooling between 2009 and 2011, consistent with free expansion of the material. This discovery suggests that some mechanism collimates ejecta away from the equatorial plane, and that after that material passes through the red giant wind, it expands freely into the cavity left by the 1985 eruption. We expect similar structures to arise from the latest eruption and to expand into the cavity shaped by the 2006 eruption.