论文标题
Fermi 1544-0649是未对准的Blazar吗？用VLBI发现喷气机构
Is Fermi 1544-0649 a misaligned blazar? discovering the jet structure with VLBI
论文作者
论文摘要
Fermi J1544-0649是在2017年GEV耀斑期间首先检测到的瞬态GEV源。在耀斑的时间内进行多波长观测，表明了典型的Blazar的变异性和光谱能量分布（SED）。除了耀斑时间，Fermi J1544-0649在GEV乐队中很安静，看起来像一个安静的星系（2Masx J15441967-0649156）十年了。与广泛的吸收系一起，我们进一步探讨了“未对齐的大黄花情景”。我们分析了2018年至2020年的非常长的基线阵列（VLBA）和东亚VLBI网络（EAVN）数据，并发现了Fermi J1544-0649的四个JET组件。我们发现一个观看角左右在3.7°至7.4°。视角的下限表明伽马射线排放效率极低的Blazar，其上限支持“未对准的Blazar场景”。 2018年以后的后续多波长观察显示了Fermi J1544-0649在GEV，X射线和光节中保持安静。还进行了对中微子的多理智搜索，并发现该来源的超过3.1σ显着性。
Fermi J1544-0649 is a transient GeV source first detected during its GeV flares in 2017. Multi-wavelength observations during the flaring time demonstrate variability and spectral energy distribution(SED) that are typical of a blazar. Other than the flare time, Fermi J1544-0649 is quiet in the GeV band and looks rather like a quiet galaxy (2MASX J15441967-0649156) for a decade. Together with the broad absorption lines feature we further explore the "misaligned blazar scenario". We analyzed the Very Long Baseline Array (VLBA) and East Asian VLBI Network (EAVN) data from 2018 to 2020 and discovered the four jet components from Fermi J1544-0649. We found a viewing angle around 3.7° to 7.4°. The lower limit of the viewing angle indicates a blazar with an extremely low duty cycle of the gamma-ray emission, the upper limit of it supports the "misaligned blazar scenario". Follow-up multi-wavelength observations after 2018 show Fermi J1544-0649 remains quiet in GeV, X-ray, and optical bands. Multi-messenger search of neutrinos is also performed, and an excess of 3.1 σ significance is found for this source.
