倒谱GPS候选源的准同时多频观测
Quasi-simultaneous multi-frequency observations of inverted-spectrum GPS candidate sources
摘要：
千兆赫兹峰谱（GPS）源可能是本振星系的前兆，现有的GPS源样本很少（<200个）。为了更详细、更有统计意义地研究千兆赫兹峰谱（GPS）源和高频峰谱（HFP）源的性质，有必要扩展它们的样本。从SPECFIND目录中提取的214个射电源的样本显示了倒置的无线电频谱，用100米Effelsberg射电望远镜在4.85，10.45和32 GHz准同时观测。使用VLBA校准器测量（VLBA calibrator survey），我们研究了源的秒差距尺度形态。在我们的样本中，大约45%的源被归类为GPS或HFP候选者。我们在现有样本中添加了65个新的GPS/HFP候选项。我们证实了预期的趋势，HFP是更紧凑的毫角秒尺度比“经典”的GPS源，峰值在较低的频率。SPECFIND数据库的数据挖掘是发现新的GPS/HFP源的一个有前途的工具。
英文摘要：
Gigahertz-Peaked Spectrum (GPS) sources are probably the precursors of local radio galaxies.Existing GPS source samples are small (<200). It is necessary to extend the availabe sample of the Gigahertz-Peaked Spectrum (GPS) and High Frequency Peaker (HFP) sources in order to study their nature with greater details and higher statistical significance. A sample of 214 radio sources, which were extracted from the SPECFIND catalog and show an inverted radio spectrum, were observed quasi-simultaneously at 4.85, 10.45, and 32GHz with the 100-m Effelsberg radio telescope. Using the VLBA calibrator survey (VCS) we have investigated the parsec-scale morphology of the sources. About 45% of the sources in our sample are classified as GPS or HFP candidates. We add 65 new GPS/HFP candidates to existing samples. We confirm the expected tendency that HFP are more compact on milliarcsecond scale than the 'classical' GPS sources, which peak at lower frequencies. The data mining of the SPECFIND database represents a promising tool for the discovery of new GPS/HFP sources.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
