耀变体CGRaBS ~ J0211 +1051的光学偏振测量（来自MIRO）
Optical polarimetry of the blazar CGRaBS~ J0211+1051 from MIRO
摘要：
我们报告了在BL Lac天体CGRaBS J 0211 +1051上的第一次详细光学线性偏振测量中检测到高偏振，该天体于2011年1月23日在$γ$射线中爆发，正如费米所报告的那样。这些观测是在2011年1月30日至2月3日期间使用安装在阿布山红天文台（MIRO）1.2米望远镜上的光偏振计进行的。2011年1月30日，检测到CGRaBS J 0211 +1051具有$\sim21.05\pm 0.41%$偏振度（DP），稳定位置角（PA）为43 $^\circ$。在1月31日和2月1日期间，虽然偏振显示出一些变化，但位置角在夜间保持稳定。在2月2日和3日期间发生了几次偏振闪光，导致DP在短时间尺度（$\sim$ 17至45分钟）的变化超过4%。在2月2日和3日的夜晚，注意到线性偏振随频率的轻微增加。在五个观测夜晚中，该源在偏振度（变化约2%至9%）和位置角（变化2至22 $^\circ$）方面表现出显着的夜间变化。源显示的夜间活动似乎与相对论性喷流中的湍流有关。PA的突然变化伴随着DP的上升可能是射流中新注入电子的指示。高偏振度和可变偏振度的探测将该源归类为低能尖峰耀变体。
英文摘要：
We report the detection of high polarization in the first detailed optical linear polarization measurements on the BL Lac object CGRaBS J0211+1051, which flared in $γ$-rays on 2011 January 23 as reported by Fermi. The observations were made during 2011 January 30 - February 3 using photo-polarimeter mounted at the 1.2m telescope of Mt Abu InfraRed Observatory(MIRO). The CGRaBS J0211+1051 was detected to have $\sim21.05\pm 0.41%$ degree of polarization (DP) with steady position angle (PA) at 43$^\circ$ on 2011 January 30. During Jan 31 and Feb 1, while polarization shows some variation, position angle remains steady for the night. Several olarization flashes occurred during February 2 and 3 resulting in changes in the DP by more than 4% at short time scales ($\sim$ 17 to 45 mins). A mild increase in the linear polarization with frequency is noticed during the nights of February 2 & 3. The source exhibited significant inter-night variations in the degree of polarization (changed by about 2 to 9%) and position angle (changed by 2 to 22$^\circ$) during the five nights of observations. The intra-night activity shown by the source appears to be related to turbulence in the relativistic jet. Sudden change in the PA accompanied by a rise in the DP could be indicative of the fresh injection of electrons in the jet. The detection of high and variable degree of polarization categorizes the source as low energy peaked blazar.
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