Properties of ICRF3 sources from SDSS spectra
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Despite their importance for astrometry and navigation, the active galactic nuclei (AGNs) that comprise the International Celestial Reference Frame (ICRF) are relatively poorly...
尽管活动星系核（active galactic nuclei, AGNs）在天体测量学与导航领域具有重要意义，但构成国际天球参考架（International Celestial Reference Frame, ICRF）的这类天体，相关研究仍相对匮乏……
