论文标题
BL LAC对象Fermi J1544-0649的多波长观察：觉醒后一年
Multi-wavelength observations of the BL Lac object Fermi J1544-0649: one year after its awakening
论文作者
论文摘要
我们报告了从无线电到\ grs的瞬态源\ fermi \的观察结果。 \ fermi \在2017年5月被{\ it fermi-lat}发现。后续{\ it swift-xrt}观察结果显示，截至2018年3月，X-ray Flux的峰值呈现了三集，而X-ray Flux的峰值约为$ 10^3美元，比{\ IT ROSAT ALL-SKY ALLY SUPPER（RASS）高度高度高。 {\ it Magellan 6.5-m望远镜}和{\ it Lick-Shane望远镜}进行的光谱测量都显示出很大的毫无特色的光谱，从而加强了\ citet {Bruni18}首先提出的BL lac解释。当高能中的通量降低到较低水平时，光学和中红外（MIR）发射在2018年较高状态。我们的{\ IT RATAN-600M}测量值为4.8〜GHz和8.2〜GHz在2017年和2018年的监测季节中没有任何显着的无线电通量变化，也不偏离档案{\ it nvss}磁通量。在GEV爆发时期，GEV频段中的频谱非常困难（$γ_γ\ sim $ 1.7），有时也很难（（（（$γ_{\ rm X}} \ Lessim2 $）在X射线中，类似于高含量的（甚至是极端的）Bl lac对象，以实现\ fermi \ fermi \ fermi \ fermi chore，望远镜}。
We report observations of a transient source \fermi\ from radio to \grs. \fermi\ was discovered by the {\it Fermi-LAT} in May 2017. Follow-up {\it Swift-XRT} observations revealed three flaring episodes through March 2018, and the peak X-ray flux is about $10^3$ higher than the {\it ROSAT all-sky survey (RASS)} flux upper limit. Optical spectral measurements taken by the {\it Magellan 6.5-m telescope} and the {\it Lick-Shane telescope} both show a largely featureless spectrum, strengthening the BL Lac interpretation first proposed by \citet{Bruni18}. The optical and mid-infrared (MIR) emission goes to a higher state in 2018, when the flux in high energies goes down to a lower level. Our {\it RATAN-600m} measurements at 4.8~GHz and 8.2~GHz do not indicate any significant radio flux variation over the monitoring seasons in 2017 and 2018, nor deviate from the archival {\it NVSS} flux level. During GeV flaring times, the spectrum is very hard ($Γ_γ\sim$1.7) in the GeV band and at times also very hard (($Γ_{\rm X}\lesssim2$) in the X-rays, similar to a high-synchrotron-peak (or even an extreme) BL Lac object, making \fermi\ a good target for ground-based {\it Cherenkov telescopes}.
