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Night to night variability of the emission lines in the nuclear spectrum of the Seyfert Galaxy NGC 3227
emission lines Galaxy nuclear spectrum
2009/7/9
Night to night variability of the emission lines in the nuclear spectrum of the Seyfert Galaxy NGC 3227。
29 May 2007，Andromeda XII offers clues to how galaxies form A“small” galaxy has been spotted entering our own part of space and could give astronomers a tantalising glimpse of how galaxies are formed.