SCP06F6：红移z~0.14的富碳河外瞬变？
SCP06F6: A carbon-rich extragalactic transient at redshift z~0.14?
摘要：
我们发现，不寻常的瞬态SCP 06 F6的光谱是一致的，从一个凉爽的，光学厚和富碳的大气排放，如果瞬态位于红移z~0.14。瞬变的河外性质排除了新星，壳闪光和V838 Mon类事件作为观测到的增亮的原因。与SCP 06 F6的距离表明其最大星等为M_I ~- 18，属超新星区。虽然SCP 06 F6的光变曲线在亮度峰值附近的形态类似于缓慢演化的I型In超新星SN 1994 Y和SN 2006 gy，但它的光谱外观与以前观测到的所有超新星都不同。我们进一步报告了在瞬态下降阶段进行的机会XMM-牛顿观测目标中与SCP 06 F6同时发生的X射线源的检测。L_X ~-（5+-1）= 42 erg/s的X射线光度比迄今观测到的超新星高两个数量级。如果与超新星事件有关，SCP 06 F6可能会定义一个新的类别。另一种可能性较小的情况是富碳恒星的潮汐破裂。
英文摘要：
We show that the spectrum of the unusual transient SCP06F6 is consistent with emission from a cool, optically thick and carbon-rich atmosphere if the transient is located at a redshift of z~0.14. The implied extragalactic nature of the transient rules out novae, shell flashes, and V838 Mon-like events as cause of the observed brightening. The distance to SCP06F6 implies a peak magnitude of M_I ~- 18, in the regime of supernovae. While the morphology of the light curve of SCP06F6 around the peak in brightness resembles the slowly evolving Type IIn supernovae SN1994Y and SN2006gy its spectroscopic appearence differs from all previous observed supernovae. We further report the detection of an X-ray source co-incident with SCP06F6 in a target of opportunity XMM-Newton observation made during the declining phase of the transient. The X-ray luminosity of L_X ~- (5+-1)e42 erg/s is two orders of magnitude higher than observed to date from supernovae. If related to a supernova event, SCP06F6 may define a new class. An alternative, though less likely, scenario is the tidal disruption of a carbon-rich star.
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