Gamma-ray亮活动星系核的干涉测量监测I：单历元多频观测结果
Interferometric Monitoring of Gamma-ray Bright AGNs I: Results of Single-epoch Multifrequency Observations
摘要：
利用韩国VLBI网络（KVN）在22、43、86和129~GHz波段对活动星系核（AGN）进行了单历元甚长基线干涉测量（VLBI）观测，这是韩国VLBI网络重点科学项目“活动星系核干涉监测”（iMOGABA）的一部分。我们选取了34个射电强活动星系核，其中30个是γ射线亮活动星系核，其通量密度为$>6\times10^{-10}$ ~ph~cm $^{-2}$ ~s $^{-1}$。在2013年11月19日和20日的24小时会议期间，对目标源进行了单历元多频VLBI观测。所有观测到的源都被检测到，并在所有频带上成像，使用或不使用频率相位转移技术，使12个微弱的源在129 GHz的成像，除了一个源。许多目标源的分辨率为毫弧秒尺度，产生一个核心喷流结构与VLBI核心主导的同步辐射的毫弧秒尺度。在22、43、86和129 GHz频段，目标源的净通量密度分别为0.43-28 Jy、0.32-21 Jy、0.18-11 Jy和0.35-8.0 Jy。
英文摘要：
We present results of single-epoch very long baseline interferometry (VLBI) observations of gamma-ray bright active galactic nuclei (AGNs) using the Korean VLBI Network (KVN) at 22, 43, 86, and 129~GHz bands, which are part of a KVN key science program, Interferometric Monitoring of Gamma-ray Bright AGNs (iMOGABA). We selected a total of 34 radio-loud AGNs of which 30 sources are gamma-ray bright AGNs with flux densities of $>6\times10^{-10}$~ph~cm$^{-2}$~s$^{-1}$. Single-epoch multi-frequency VLBI observations of the target sources were conducted during a 24-hr session on 2013 November 19 and 20. All observed sources were detected and imaged at all frequency bands with or without a frequency phase transfer technique which enabled the imaging of 12 faint sources at 129~GHz, except for one source. Many of the target sources are resolved on milliarcsecond scales, yielding a core-jet structure with the VLBI core dominating the synchrotron emission on the milliarcsecond scale. CLEAN flux densities of the target sources are 0.43-28~Jy, 0.32-21~Jy, 0.18-11~Jy, and 0.35-8.0~Jy in the 22, 43, 86, and 129~GHz bands, respectively.
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