Flares, wind and nebulae: the 2015 December mini-outburst of V404 Cygni

Flares, wind and nebulae: the 2015 December mini-outburst of V404 Cygni
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耀斑、风和星云:2015 年 12 月天鹅座 V404 的小型爆发

DOI:
10.1093/mnrasl/slw222
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发表时间:
2016
期刊:
Letters
影响因子:
--
通讯作者:
Mu Noz-Darias T
Mu Noz-Darias T
中科院分区:
--
文献类型:
--
作者:
Mu Noz-Darias T

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在沉寂了26年多之后,黑洞瞬变V404天鹅座在2015年6月进入发光爆发,同年12月下旬探测到额外的活动。在这里,我们介绍了12月微小爆发的光学光谱跟踪,以及跨越一个多月的X射线、光学和无线电监测。在斯威夫特触发后的10天内,在∼的三个光谱范围内检测到强度逐渐增加的强耀斑。我们的光谱揭示了快速外流风的存在,正如探测到终端速度为∼2500 Km S−1的P-Cyg廓线所暗示的那样。我们还观察到了类似星云的光谱--其Hα当量宽度为∼500?所有这些特征都与2015年6月主要爆发时的特征相似。因此,与射电急流同时出现的快速光学风很可能出现在每一次V404天鹅座爆发中。最后,我们报告了在2016年1月下旬探测到一次强烈射电耀斑的情况,当时由于太阳的限制,X射线和光学监测已经停止。
After more than 26 years in quiescence, the black hole transient V404 Cyg went into a luminous outburst in June 2015, and additional activity was detected in late December of the same year. Here, we present an optical spectroscopic follow-up of the December mini-outburst, together with X-ray, optical and radio monitoring that spanned more than a month. Strong flares with gradually increasing intensity are detected in the three spectral ranges during the ∼10 days following the Swift trigger. Our optical spectra reveal the presence of a fast outflowing wind, as implied by the detection of a P-Cyg profile (Hei–5876 Å) with a terminal velocity of ∼ 2500 km s−1. Nebular-like spectra – with an Hα equivalent width of ∼500 Å – are also observed. All these features are similar to those seen during the main June 2015 outburst. Thus, the fast optical wind simultaneous with the radio jet is most likely present in every V404 Cyg outburst. Finally, we report on the detection of a strong radio flare in late January 2016, when X-ray and optical monitoring had stopped due to Sun constraints.
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