19个1.6 GHz峰谱射电源的VLBI观测
VLBI observations of nineteen GHz-Peaked-Spectrum radio sources at 1.6 GHz
摘要：
目的和方法：我们提出的VLBI观测结果的19 GHz峰值频谱（GPS）的无线电源在1.6 GHz。其中15个来源于Parkes Half Jansky（PHJ）样本（Snellen 2002），另外4个来源于我们以前的观测列表。我们的目标是对GPS源的结构进行成像，寻找紧凑对称目标（CSO），并研究GPS源的凸光谱的吸收。结果：首次获得了17个源的总强度1.6GHz VLBI图像。其中80%的活动星系核具有小双瓣射电结构，表明它们是CSO或候选者，其宿主活动星系核可能与我们相对。这一结果表明，在PHJ样本中有很高的发生率的迷你双瓣源（或CSO）。J 0323 +0534、J1135-0021、J1352+0232、J2058+0540、J2123-0112和J2325-0344等具有红移的源，显示出尺寸小于1 kpc的双瓣结构，被归类为CSO。根据J1057+0012、J1600-0037和J1753+2750这3个源的形态特征和流量变化特征，认为它们是核心喷流源。
英文摘要：
Aims and Methods: We present the results of VLBI observations of nineteen GHz-Peaked-Spectrum (GPS) radio sources at 1.6 GHz. Of them, 15 sources are selected from the Parkes Half Jansky (PHJ) sample (Snellen 2002), 4 others are from our previous observation list. We aimed at imaging the structure of GPS sources, searching for Compact Symmetric Objects (CSOs) and studying the absorption for the convex radio spectra of GPS sources. Results: We obtained total intensity 1.6 GHz VLBI images of 17 sources for the first time. Of them, 80% show mini-double-lobe radio structure, indicating that they are CSOs or candidates, and their host AGNs could be edge-on to us. This result suggests that there is a high incidence of mini double-lobe sources (or CSOs) in the PHJ sample. The sources J0323+0534, J1135-0021, J1352+0232, J2058+0540, J2123-0112 and J2325-0344 with measured redshift, showing double-lobe structure with sizes of <1 kpc, are classified as CSOs. Three sources J1057+0012, J1600-0037 and J1753+2750 are considered as core-jet sources according to their morphologies and flux variability.
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