论文标题
MRK 212中双核的多波长研究
A Multi-wavelength Study of the Dual Nuclei in Mrk 212
论文作者
论文摘要
我们介绍了与Karl G. Jansky非常大的阵列（VLA）和升级的巨型仪表射程望远镜（UGMRT）的Garl G. Jansky的无线电观察结果。 MRK 212具有两个先前已知的无线电来源，与两个光学核，S1和S2相关，其预计分离约为6 kpc，使其成为双重活性银河系核（AGN）候选者。我们新的15 GHz VLA观察结果表明，S1是围绕光学核的双重无线电源。它的总范围约为750 parsec，其平均1.4-8.5 GHz光谱指数为-0.81 +/- 0.06。因此，S1类似于紧凑的对称对象（CSO）。 15 GHz VLA图像将S2处的无线电源标识为紧凑的核心。因此，我们的无线电观察结果强烈支持MRK 212中双重AGN的存在。但是，从喜马拉雅chandra望远镜（HCT）观测值获得的光发射线通量比，但是，S1和S2都在BPT图的AGN + SF（星形形成）区域中均落入。在文献中确实已经报道了位于BPT图中SF或AGN + SF中间区域中的弱AGN。我们的消息来源显然属于同一类别。我们在新减少的8.5 GHz VLA数据中发现了扩展的无线电结构，与光学核S2的光学核S2相抵消。新的深FUV和NUV观察和NUV观察结果，紫外线成像望远镜（UVIT）ASTROSAT上的astrosat沿Astrosat上的sf nots s2和kpc-scale thecter the Exted noction the thourtight rotection the thourtigent rotect the s2 co note the s2 co.s2 noct joots s22 knots jots； GHz。
We present radio observations of the galaxy merger remnant Mrk 212 with the Karl G. Jansky Very Large Array (VLA) and the upgraded Giant Meter Radio Telescope (uGMRT). Mrk 212 has two previously known radio sources associated with the two optical nuclei, S1 and S2, with a projected separation of ~6 kpc, making it a dual active galactic nuclei (AGN) candidate. Our new 15 GHz VLA observations reveal that S1 is a double radio source centred around the optical nucleus; its total extent is ~750 parsec and its average 1.4-8.5 GHz spectral index is -0.81 +/- 0.06. S1 therefore, resembles a compact symmetric object (CSO). The 15 GHz VLA image identifies the radio source at S2 to be a compact core. Our radio observations therefore strongly support the presence of a dual AGN in Mrk 212. The optical emission line flux ratios obtained from the Himalayan Chandra Telescope (HCT) observations however, show that S1 and S2 both fall in the AGN + SF (star formation) region of the BPT diagram. Weak AGN lying in the SF or AGN + SF intermediate regions in the BPT diagram have indeed been reported in the literature; our sources clearly fall in the same category. We find an extended radio structure in our newly reduced 8.5 GHz VLA data, that is offset by ~1" from the optical nucleus S2. New deep FUV and NUV observations with the Ultraviolet Imaging Telescope (UVIT) aboard AstroSat reveal SF knots around S2 as well as kpc-scale tidal tails; the SF knots around S2 coincide with the extended radio structure detected at 8.5 GHz. The radio spectral indices are consistent with SF. Any possible association with the AGN in S2 is unclear at this stage.
